EN ESTA PÁGINA
Ejemplo: configuración de la programación de red SRv6 en redes IS-IS
En este ejemplo se muestra cómo configurar la programación de red SRv6 en una red IS-IS. Esta característica es útil para los proveedores de servicios cuyas redes son predominantemente IPv6 y no han implementado MPLS. Estas redes dependen únicamente de los encabezados y extensiones de encabezado IPv6 para transmitir datos. La programación de red SRv6 proporciona flexibilidad para aprovechar el enrutamiento por segmentos sin implementar MPLS.
Requisitos
En este ejemplo se utilizan los siguientes componentes de hardware y software:
Ocho enrutadores serie MX con tarjetas de línea MPC7E, MPC8E o MPC9E
Junos OS versión 20.3R1 o posterior
Visión general
A partir de Junos OS versión 20.3R1, puede configurar SRv6 sin MPLS en una red IPv6 central. La programación de red SRv6 es la capacidad de una red para codificar un programa de red en instrucciones de red individuales que luego se insertan en los encabezados de paquete IPv6. El paquete IPv6 que contiene las instrucciones de red informa explícitamente a la red acerca de los nodos SRv6 precisos disponibles para el procesamiento de paquetes. La instrucción de red es el identificador de segmento SRv6 (SID) representado por direcciones IPv6 de 128 bits. Estas instrucciones se distribuyen a través de la red en los encabezados de paquete IPv6. Junto con el direccionamiento, las instrucciones de red definen una tarea o función particular para cada nodo compatible con SRv6 en la red SRv6. Esta característica beneficia a las redes que necesitan desplegar tráfico de SR a través de enrutadores de tránsito que aún no tienen capacidad de enrutamiento por segmentos.
Topología
En la figura 1, los enrutadores R0 y R7 son enrutadores de entrada y salida que admiten solo dispositivos IPv4 CE1 y CE2. Los enrutadores R1, R2, R3, R4, R5 y R6 comprenden una red central de proveedor solo IPv6. Todos los routers pertenecen al mismo sistema autónomo. IS-IS es el protocolo de puerta de enlace interior en el núcleo IPv6 y está configurado para admitir SRv6. En este ejemplo, el enrutador R2 se configura como un reflector de ruta IPv6 con sesiones de emparejamiento IBGP tanto para R0 como para R7. Ningún otro enrutador habla BGP en este ejemplo.
Para demostrar mejor la tunelización de SRv6, este ejemplo se basa en un núcleo de proveedor IPv6 puro. SRv6 es compatible con un núcleo de pila dual en el que se despliegan IPv6 e IPv4.
Los enrutadores perimetrales compatibles con dispositivos IPv4 necesitan transportar tráfico IPv4 mediante encapsulación de túnel IPv6. Los túneles de encapsulación se derivan de SID SRv6 configurados en enrutadores habilitados para SRv6. El protocolo IS-IS procesa estos SID SRv6 y actualiza la tabla inet6.3 con las direcciones del salto siguiente de los extremos de túnel disponibles. Cuando se aprende una ruta IPv4 a través de BGP, el enrutador intenta resolver el siguiente salto asociado a través de la tabla inet6.3. Cuando se encuentra una entrada coincidente, el resultado es un túnel IPv6 automático al extremo que anunciaba la ruta BGP.
En este ejemplo, los enrutadores R0 y R7 anuncian su subred IPv4 conectada mediante BGP. Esto da como resultado túneles IPv6 entre los enrutadores de borde. Los túneles se utilizan para transportar el tráfico IPv4 a través del núcleo del proveedor IPv6. En la salida, los enrutadores perimetrales desencapsulan el encabezado IPv6 externo y realizan una búsqueda de ruta IPv4 para reenviar el paquete a su destino.
Configuración
Configuración rápida de CLI
Para configurar rápidamente este ejemplo, copie los siguientes comandos, péguelos en un archivo de texto, elimine los saltos de línea, cambie los detalles necesarios para que coincidan con su configuración de red, copie y pegue los comandos en la CLI en el nivel de jerarquía y, a continuación, ingrese commit desde el [edit] modo de configuración.
Enrutador R0
set interfaces xe-0/0/0:0 description To_R1 set interfaces xe-0/0/0:0 mtu 4000 set interfaces xe-0/0/0:0 unit 0 family iso set interfaces xe-0/0/0:0 unit 0 family inet6 address 2001:db8:1::1/64 set interfaces xe-0/0/0:2 description To_R4 set interfaces xe-0/0/0:2 mtu 4000 set interfaces xe-0/0/0:2 unit 0 family iso set interfaces xe-0/0/0:2 unit 0 family inet6 address 2001:db8:4::1/64 set interfaces xe-0/0/1:0 description To_CE1 set interfaces xe-0/0/1:0 unit 0 family inet address 172.16.10.2/24 set interfaces xe-0/0/1:0 unit 0 family iso set interfaces lo0 unit 0 family iso address 49.0001.000a.0a0a.0a00 set interfaces lo0 unit 0 family inet6 address 2001:db8:10:255::10/128 set policy-options policy-statement pplb then load-balance per-packet set routing-options source-packet-routing srv6 locator myloc 2001:db8:0:a0::/64 set routing-options forwarding-table export pplb set routing-options router-id 172.16.255.10 set policy-options policy-statement CE1_v4 term 1 from protocol direct set policy-options policy-statement CE1_v4 term 1 from route-filter 172.16.10.0/24 exact set policy-options policy-statement CE1_v4 term 1 then next-hop 2001:db8:0:a0:d01:: set policy-options policy-statement CE1_v4 term 1 then accept set routing-options autonomous-system 65550 set protocols bgp group to-R2RRv6 type internal set protocols bgp group to-R2RRv6 export CE1_v4 set protocols bgp group to-R2RRv6 local-address 2001:db8:10:255::10 set protocols bgp group to-R2RRv6 neighbor 2001:db8:2:255::2 family inet unicast extended-nexthop set protocols isis interface xe-0/0/0:0.0 level 2 srv6-adjacency-segment protected locator myloc end-x-sid 2001:db8:0:a0:1a01:: flavor psp set protocols isis interface xe-0/0/0:0.0 node-link-protection set protocols isis interface xe-0/0/0:0.0 point-to-point set protocols isis interface xe-0/0/0:2.0 level 2 srv6-adjacency-segment protected locator myloc end-x-sid 2001:db8:0:a0:1a04:: flavor psp set protocols isis interface xe-0/0/0:2.0 node-link-protection set protocols isis interface xe-0/0/0:2.0 point-to-point set protocols isis interface lo0.0 passive set protocols isis source-packet-routing srv6 locator myloc end-sid 2001:db8:0:a0:d01:: flavor usd set protocols isis level 1 disable
Enrutador R1
set interfaces xe-0/0/0:0 description To_R0 set interfaces xe-0/0/0:0 mtu 4000 set interfaces xe-0/0/0:0 unit 0 family iso set interfaces xe-0/0/0:0 unit 0 family inet6 address 2001:db8:1::2/64 set interfaces xe-0/0/0:2 description To_R2 set interfaces xe-0/0/0:2 mtu 4000 set interfaces xe-0/0/0:2 unit 0 family iso set interfaces xe-0/0/0:2 unit 0 family inet6 address 2001:db8:12:1/64 set interfaces xe-0/0/0:3 description to-R4 set interfaces xe-0/0/0:3 mtu 4000 set interfaces xe-0/0/0:3 unit 0 family iso set interfaces xe-0/0/0:3 unit 0 family inet6 address 2001:db8:14::1/64 set interfaces xe-0/0/1:0 description to-R5 set interfaces xe-0/0/1:0 mtu 4000 set interfaces xe-0/0/1:0 unit 0 family iso set interfaces xe-0/0/1:0 unit 0 family inet6 address 2001:db8:15::1/64 set interfaces lo0 unit 0 family iso address 49.0001.0001.0101.0100 set interfaces lo0 unit 0 family inet6 address 2001:db8:1:255::1/128 set policy-options policy-statement pplb then load-balance per-packet set routing-options source-packet-routing srv6 locator myloc 2001:db8:0:a1::/64 set routing-options forwarding-table export pplb set routing-options router-id 192.168.255.1 set protocols isis interface xe-0/0/0:0.0 level 2 srv6-adjacency-segment protected locator myloc end-x-sid 2001:db8:0:a1:1a10:: flavor psp set protocols isis interface xe-0/0/0:0.0 node-link-protection set protocols isis interface xe-0/0/0:0.0 point-to-point set protocols isis interface xe-0/0/0:2.0 level 2 srv6-adjacency-segment protected locator myloc end-x-sid 2001:db8:0:a1:1a12:: flavor psp set protocols isis interface xe-0/0/0:2.0 node-link-protection set protocols isis interface xe-0/0/0:2.0 point-to-point set protocols isis interface xe-0/0/0:2.1 node-link-protection set protocols isis interface xe-0/0/0:3.0 level 2 srv6-adjacency-segment protected locator myloc end-x-sid 2001:db8:0:a1:1a14:: flavor psp set protocols isis interface xe-0/0/0:3.0 node-link-protection set protocols isis interface xe-0/0/0:3.0 point-to-point set protocols isis interface xe-0/0/1:0.0 level 2 srv6-adjacency-segment protected locator myloc end-x-sid 2001:db8:0:a1:1a15:: flavor psp set protocols isis interface xe-0/0/1:0.0 node-link-protection set protocols isis interface xe-0/0/1:0.0 point-to-point set protocols isis interface lo0.0 passive set protocols isis source-packet-routing srv6 locator myloc end-sid 2001:db8:0:a1:d11:: flavor usd set protocols isis level 1 disable
Enrutador R2
set interfaces xe-0/0/0:0 description To_R1 set interfaces xe-0/0/0:0 mtu 4000 set interfaces xe-0/0/0:0 unit 0 family iso set interfaces xe-0/0/0:0 unit 0 family inet6 address 2001:db8:12::2/64 set interfaces xe-0/0/0:1 description To_R3 set interfaces xe-0/0/0:1 mtu 4000 set interfaces xe-0/0/0:1 unit 0 family iso set interfaces xe-0/0/0:1 unit 0 family inet6 address 2001:db8:23::1/64 set interfaces xe-0/0/0:2 description To_R4 set interfaces xe-0/0/0:2 mtu 4000 set interfaces xe-0/0/0:2 unit 0 family iso set interfaces xe-0/0/0:2 unit 0 family inet6 address 2011:db8:24::1/64 set interfaces xe-0/0/0:3 description To_R5 set interfaces xe-0/0/0:3 mtu 4000 set interfaces xe-0/0/0:3 unit 0 family iso set interfaces xe-0/0/0:3 unit 0 family inet6 address 2001:db8:25::1/64 set interfaces xe-0/0/1:0 description To_R6 set interfaces xe-0/0/1:0 mtu 4000 set interfaces xe-0/0/1:0 unit 0 family iso set interfaces xe-0/0/1:0 unit 0 family inet6 address 2001:db8:26::1/64 set interfaces lo0 unit 0 family iso address 49.0001.0002.0202.0200 set interfaces lo0 unit 0 family inet6 address 2001:db8:2:255::2/128 set policy-options policy-statement pplb then load-balance per-packet set routing-options source-packet-routing srv6 locator myloc 2001:db8:0:a2::/64 set routing-options forwarding-table export pplb set routing-options router-id 192.168.255.2 set routing-options autonomous-system 65550 set protocols bgp group RRv6 type internal set protocols bgp group RRv6 local-address 2001:db8:2:255::2 set protocols bgp group RRv6 neighbor 2001:db8:10:255::10 family inet unicast extended-nexthop set protocols bgp group RRv6 neighbor 2001:db8:20:255::20 family inet unicast extended-nexthop set protocols bgp group RRv6 cluster 192.168.255.2 set protocols isis interface xe-0/0/0:0.0 level 2 srv6-adjacency-segment protected locator myloc end-x-sid 2001:db8:0:a2:1a21:: flavor psp set protocols isis interface xe-0/0/0:0.0 node-link-protection set protocols isis interface xe-0/0/0:0.0 point-to-point set protocols isis interface xe-0/0/0:1.0 level 2 srv6-adjacency-segment protected locator myloc end-x-sid 2001:db8:0:a2:1a23:: flavor psp set protocols isis interface xe-0/0/0:1.0 node-link-protection set protocols isis interface xe-0/0/0:1.0 point-to-point set protocols isis interface xe-0/0/0:2.0 level 2 srv6-adjacency-segment protected locator myloc end-x-sid 2001:db8:0:a2:1a24:: flavor psp set protocols isis interface xe-0/0/0:2.0 node-link-protection set protocols isis interface xe-0/0/0:2.0 point-to-point set protocols isis interface xe-0/0/0:3.0 level 2 srv6-adjacency-segment protected locator myloc end-x-sid 2001:db8:0:a2:1a25:: flavor psp set protocols isis interface xe-0/0/0:3.0 node-link-protection set protocols isis interface xe-0/0/0:3.0 point-to-point set protocols isis interface xe-0/0/1:0.0 level 2 srv6-adjacency-segment protected locator myloc end-x-sid 2001:db8:0:a2:1a26:: flavor psp set protocols isis interface xe-0/0/1:0.0 node-link-protection set protocols isis interface xe-0/0/1:0.0 point-to-point set protocols isis interface lo0.0 passive set protocols isis source-packet-routing srv6 locator myloc end-sid 2001:db8:0:a2:d21:: flavor usd set protocols isis level 1 disable
Enrutador R3
set interfaces xe-0/0/0:0 description To_R2 set interfaces xe-0/0/0:0 mtu 4000 set interfaces xe-0/0/0:0 unit 0 family iso set interfaces xe-0/0/0:0 unit 0 family inet6 address 2001:db8:23::2/64 set interfaces xe-0/0/0:1 description To_R5 set interfaces xe-0/0/0:1 mtu 4000 set interfaces xe-0/0/0:1 unit 0 family iso set interfaces xe-0/0/0:1 unit 0 family inet6 address 2001:db8:35::1/64 set interfaces xe-0/0/0:2 description To_R6 set interfaces xe-0/0/0:2 mtu 4000 set interfaces xe-0/0/0:2 unit 0 family iso set interfaces xe-0/0/0:2 unit 0 family inet6 address 36::1/64 set interfaces xe-0/0/0:3 description To_R7 set interfaces xe-0/0/0:3 mtu 4000 set interfaces xe-0/0/0:3 unit 0 family iso set interfaces xe-0/0/0:3 unit 0 family inet6 address 2001:db8:37::1/64 set interfaces lo0 unit 0 family iso address 49.0001.0003.0303.0300 set interfaces lo0 unit 0 family inet6 address 2001:db8:3:255::3/128 set policy-options policy-statement pplb then load-balance per-packet set routing-options source-packet-routing srv6 locator myloc 2001:db8:0:a3::/64 set routing-options forwarding-table export pplb set routing-options router-id 192.168.255.3 set protocols isis interface xe-0/0/0:0.0 level 2 srv6-adjacency-segment protected locator myloc end-x-sid 2001:db8:0:a3:1a32:: flavor psp set protocols isis interface xe-0/0/0:0.0 node-link-protection set protocols isis interface xe-0/0/0:0.0 point-to-point set protocols isis interface xe-0/0/0:1.0 level 2 srv6-adjacency-segment protected locator myloc end-x-sid 2001:db8:0:a3:1a35:: flavor psp set protocols isis interface xe-0/0/0:1.0 node-link-protection set protocols isis interface xe-0/0/0:1.0 point-to-point set protocols isis interface xe-0/0/0:2.0 level 2 srv6-adjacency-segment protected locator myloc end-x-sid 2001:db8:0:a3:1a36:: flavor psp set protocols isis interface xe-0/0/0:2.0 node-link-protection set protocols isis interface xe-0/0/0:2.0 point-to-point set protocols isis interface xe-0/0/0:3.0 level 2 srv6-adjacency-segment protected locator myloc end-x-sid 2001:db8:0:a3:1a37:: flavor psp set protocols isis interface xe-0/0/0:3.0 node-link-protection set protocols isis interface xe-0/0/0:3.0 point-to-point set protocols isis interface lo0.0 passive set protocols isis source-packet-routing srv6 locator myloc end-sid 2001:db8:0:a3:d31:: flavor usd set protocols isis level 1 disable
Enrutador R4
set interfaces xe-0/0/0:0 description To_R0 set interfaces xe-0/0/0:0 mtu 4000 set interfaces xe-0/0/0:0 unit 0 family iso set interfaces xe-0/0/0:0 unit 0 family inet6 address 2001:db8:4::2/64 set interfaces xe-0/0/0:2 description To_R1 set interfaces xe-0/0/0:2 mtu 4000 set interfaces xe-0/0/0:2 unit 0 family iso set interfaces xe-0/0/0:2 unit 0 family inet6 address 2001:db8:14::2/64 set interfaces xe-0/0/0:3 description To_R2 set interfaces xe-0/0/0:3 mtu 4000 set interfaces xe-0/0/0:3 unit 0 family iso set interfaces xe-0/0/0:3 unit 0 family inet6 address 2001:db8:24::2/64 set interfaces xe-0/0/1:0 description To_R5 set interfaces xe-0/0/1:0 mtu 4000 set interfaces xe-0/0/1:0 unit 0 family iso set interfaces xe-0/0/1:0 unit 0 family inet6 address 2001:db8:25::1/64 set interfaces lo0 unit 0 family iso address 49.0001.0004.0404.0400 set interfaces lo0 unit 0 family inet6 address 2001:db8:4:255::4/128 set policy-options policy-statement pplb then load-balance per-packet set routing-options source-packet-routing srv6 locator myloc 2001:db8:0:a4::/64 set routing-options forwarding-table export pplb set routing-options router-id 192.168.255.4 set protocols isis interface xe-0/0/0:0.0 level 2 srv6-adjacency-segment protected locator myloc end-x-sid 2001:db8:0:a4:1a40:: flavor psp set protocols isis interface xe-0/0/0:0.0 node-link-protection set protocols isis interface xe-0/0/0:0.0 point-to-point set protocols isis interface xe-0/0/0:2.0 level 2 srv6-adjacency-segment protected locator myloc end-x-sid 2001:db8:0:a4:1a41:: flavor psp set protocols isis interface xe-0/0/0:2.0 node-link-protection set protocols isis interface xe-0/0/0:2.0 point-to-point set protocols isis interface xe-0/0/0:3.0 level 2 srv6-adjacency-segment protected locator myloc end-x-sid 2001:db8:0:a4:1a42:: flavor psp set protocols isis interface xe-0/0/0:3.0 node-link-protection set protocols isis interface xe-0/0/0:3.0 point-to-point set protocols isis interface xe-0/0/1:0.0 level 2 srv6-adjacency-segment protected locator myloc end-x-sid 2001:db8:0:a4:1a45:: flavor psp set protocols isis interface xe-0/0/1:0.0 node-link-protection set protocols isis interface xe-0/0/1:0.0 point-to-point set protocols isis interface lo0.0 passive set protocols isis source-packet-routing srv6 locator myloc end-sid 2001:db8:0:a4:d41:: flavor usd set protocols isis level 1 disable
Enrutador R5
set interfaces xe-0/0/0:0 description To_R1 set interfaces xe-0/0/0:0 mtu 4000 set interfaces xe-0/0/0:0 unit 0 family iso set interfaces xe-0/0/0:0 unit 0 family inet6 address 2001:db8:15::2/64 set interfaces xe-0/0/0:1 description To_R2 set interfaces xe-0/0/0:1 mtu 4000 set interfaces xe-0/0/0:1 unit 0 family iso set interfaces xe-0/0/0:1 unit 0 family inet6 address 2001:db8:25::2/64 set interfaces xe-0/0/0:2 description To_R3 set interfaces xe-0/0/0:2 mtu 4000 set interfaces xe-0/0/0:2 unit 0 family iso set interfaces xe-0/0/0:2 unit 0 family inet6 address 2001:db8:35::2/64 set interfaces xe-0/0/0:3 description To_R4 set interfaces xe-0/0/0:3 mtu 4000 set interfaces xe-0/0/0:3 unit 0 family iso set interfaces xe-0/0/0:3 unit 0 family inet6 address 2001:db8:45::2/64 set interfaces xe-0/0/1:0 description To_R6 set interfaces xe-0/0/1:0 mtu 4000 set interfaces xe-0/0/1:0 unit 0 family iso set interfaces xe-0/0/1:0 unit 0 family inet6 address 2001:db8:56::1/64 set interfaces lo0 unit 0 family iso address 49.0001.0005.0505.0500 set interfaces lo0 unit 0 family inet6 address 2001:db8:5:255::5/128 set policy-options policy-statement pplb then load-balance per-packet set routing-options source-packet-routing srv6 locator myloc 2001:db8:0:a5::/64 set routing-options forwarding-table export pplb set routing-options router-id 192.168.255.5 set protocols isis interface xe-0/0/0:0.0 level 2 srv6-adjacency-segment protected locator myloc end-x-sid 2001:db8:0:a5:1a51:: flavor psp set protocols isis interface xe-0/0/0:0.0 node-link-protection set protocols isis interface xe-0/0/0:0.0 point-to-point set protocols isis interface xe-0/0/0:1.0 level 2 srv6-adjacency-segment protected locator myloc end-x-sid 2001:db8:0:a5:1a52:: flavor psp set protocols isis interface xe-0/0/0:1.0 node-link-protection set protocols isis interface xe-0/0/0:1.0 point-to-point set protocols isis interface xe-0/0/0:2.0 level 2 srv6-adjacency-segment protected locator myloc end-x-sid 2001:db8:0:a5:1a53:: flavor psp set protocols isis interface xe-0/0/0:2.0 node-link-protection set protocols isis interface xe-0/0/0:2.0 point-to-point set protocols isis interface xe-0/0/0:3.0 level 2 srv6-adjacency-segment protected locator myloc end-x-sid 2001:db8:0:a5:1a54:: flavor psp set protocols isis interface xe-0/0/0:3.0 node-link-protection set protocols isis interface xe-0/0/0:3.0 point-to-point set protocols isis interface xe-0/0/1:0.0 level 2 srv6-adjacency-segment protected locator myloc end-x-sid 2001:db8:0:a5:1a56:: flavor psp set protocols isis interface xe-0/0/1:0.0 node-link-protection set protocols isis interface xe-0/0/1:0.0 point-to-point set protocols isis interface lo0.0 passive set protocols isis source-packet-routing srv6 locator myloc end-sid 2001:db8:0:a5:d51:: flavor usd set protocols isis level 1 disable
Enrutador R6
set interfaces xe-0/0/0:0 description To_R2 set interfaces xe-0/0/0:0 mtu 4000 set interfaces xe-0/0/0:0 unit 0 family iso set interfaces xe-0/0/0:0 unit 0 family inet6 address 2001:db8:26::2/64 set interfaces xe-0/0/0:1 description To_R3 set interfaces xe-0/0/0:1 mtu 4000 set interfaces xe-0/0/0:1 unit 0 family iso set interfaces xe-0/0/0:1 unit 0 family inet6 address 2001:db8:36::2/128 set interfaces xe-0/0/0:2 description To_R5 set interfaces xe-0/0/0:2 mtu 4000 set interfaces xe-0/0/0:2 unit 0 family iso set interfaces xe-0/0/0:2 unit 0 family inet6 address 2001:db8:56::2/128 set interfaces xe-0/0/0:3 description To_R7 set interfaces xe-0/0/0:3 mtu 4000 set interfaces xe-0/0/0:3 unit 0 family iso set interfaces xe-0/0/0:3 unit 0 family inet6 address 2001:db8:67::1/128 set interfaces lo0 unit 0 family iso address 49.0001.0006.0606.0600 set interfaces lo0 unit 0 family inet6 address 2001:db8:6:255::6/128 set policy-options policy-statement pplb then load-balance per-packet set routing-options source-packet-routing srv6 locator myloc 2001:db8:0:a6::/64 set routing-options forwarding-table export pplb set routing-options router-id 192.168.255.6 set protocols isis interface xe-0/0/0:0.0 level 2 srv6-adjacency-segment protected locator myloc end-x-sid 2001:db8:0:a6:1a62:: flavor psp set protocols isis interface xe-0/0/0:0.0 node-link-protection set protocols isis interface xe-0/0/0:0.0 point-to-point set protocols isis interface xe-0/0/0:1.0 level 2 srv6-adjacency-segment protected locator myloc end-x-sid 2001:db8:0:a6:1a63:: flavor psp set protocols isis interface xe-0/0/0:1.0 node-link-protection set protocols isis interface xe-0/0/0:1.0 point-to-point set protocols isis interface xe-0/0/0:2.0 level 2 srv6-adjacency-segment protected locator myloc end-x-sid 2001:db8:0:a6:1a65:: flavor psp set protocols isis interface xe-0/0/0:2.0 node-link-protection set protocols isis interface xe-0/0/0:2.0 point-to-point set protocols isis interface xe-0/0/0:3.0 level 2 srv6-adjacency-segment protected locator myloc end-x-sid 2001:db8:0:a6:1a67:: flavor psp set protocols isis interface xe-0/0/0:3.0 node-link-protection set protocols isis interface xe-0/0/0:3.0 point-to-point set protocols isis interface lo0.0 passive set protocols isis source-packet-routing srv6 locator myloc end-sid 2001:db8:0:a6:d61:: flavor usd set protocols isis level 1 disable
Enrutador R7
set interfaces xe-0/0/0:0 description To_R3 set interfaces xe-0/0/0:0 mtu 4000 set interfaces xe-0/0/0:0 unit 0 family iso set interfaces xe-0/0/0:0 unit 0 family inet6 address 2001:db8:37::2/64 set interfaces xe-0/0/0:1 description To_R6 set interfaces xe-0/0/0:1 mtu 4000 set interfaces xe-0/0/0:1 unit 0 family iso set interfaces xe-0/0/0:1 unit 0 family inet6 address 2001:db8:67::2/128 set interfaces xe-0/0/0:2 description To_CE2 set interfaces xe-0/0/0:2 unit 0 family inet address 172.16.20.2/24 set interfaces xe-0/0/0:2 unit 0 family iso set interfaces lo0 unit 0 family iso address 49.0001.0007.0707.0700 set interfaces lo0 unit 0 family inet6 address 2001:db8:20:255::20/32 set policy-options policy-statement pplb then load-balance per-packet set policy-options policy-statement CE2_v4 term 1 from protocol direct set policy-options policy-statement CE2_v4 term 1 from route-filter 172.16.20.0/24 exact set policy-options policy-statement CE2_v4 term 1 then next-hop 2001:db8:0:a7::d71 set policy-options policy-statement CE2_v4 term 1 then accept set routing-options source-packet-routing srv6 locator myloc 2001:db8:0:a7::/64 set routing-options forwarding-table export pplb set routing-options router-id 172.16.255.20 set routing-options autonomous-system 65550 set protocols bgp group to-R2RRv6 type internal set protocols bgp group to-R2RRv6 local-address 2001:db8:20:255::20 set protocols bgp group to-R2RRv6 neighbor 2001:db8:2:255::2 family inet unicast extended-nexthop set protocols bgp group to-R2RRv6 export CE2_v4 set protocols isis interface xe-0/0/0:0.0 level 2 srv6-adjacency-segment protected locator myloc end-x-sid 2001:db8:0:a7:1a73:: flavor psp set protocols isis interface xe-0/0/0:0.0 node-link-protection set protocols isis interface xe-0/0/0:0.0 point-to-point set protocols isis interface xe-0/0/0:1.0 level 2 srv6-adjacency-segment protected locator myloc end-x-sid 2001:db8:0:a7:1a76:: flavor psp set protocols isis interface xe-0/0/0:1.0 node-link-protection set protocols isis interface xe-0/0/0:1.0 point-to-point set protocols isis interface lo0.0 passive set protocols isis source-packet-routing srv6 locator myloc end-sid 2001:db8:0:a7:d71:: flavor usd set protocols isis level 1 disable
Configuración del enrutador R0
El ejemplo siguiente requiere que navegue por varios niveles en la jerarquía de configuración. Para obtener información acerca de cómo navegar por la CLI, consulte Uso del editor de CLI en modo de configuración en la Guía del usuario de CLI.
Para configurar la programación de red SRv6 para admitir túneles IPv4 a través de un núcleo IPv6, realice los pasos siguientes en el enrutador R0:
Procedimiento paso a paso
-
Configure las interfaces de dispositivo para habilitar el transporte IP.
[edit] user@R0# set interfaces xe-0/0/0:0 description To_R1_1 user@R0# set interfaces xe-0/0/0:0 vlan-tagging user@R0# set interfaces xe-0/0/0:0 unit 0 vlan-id 1 user@R0# set interfaces xe-0/0/0:0 unit 0 family inet address 10.11.1.1/24 user@R0# set interfaces xe-0/0/0:0 unit 0 family iso user@R0# set interfaces xe-0/0/0:0 unit 0 family inet6 address 2001:db8:1001::1/32 user@R0# set interfaces xe-0/0/0:2 description To_R4_1 user@R0# set interfaces xe-0/0/0:2 vlan-tagging user@R0# set interfaces xe-0/0/0:2 unit 0 vlan-id 1 user@R0# set interfaces xe-0/0/0:2 unit 0 family inet address 10.21.1.1/24 user@R0# set interfaces xe-0/0/0:2 unit 0 family iso user@R0# set interfaces xe-0/0/0:2 unit 0 family inet6 address 2001:db8:2021::1/32 user@R0# set interfaces xe-0/0/1:0 description to_RT user@R0# set interfaces xe-0/0/1:0 vlan-tagging user@R0# set interfaces xe-0/0/1:0 unit 1 vlan-id 1 user@R0# set interfaces xe-0/0/1:0 unit 1 family inet address 172.20.1.1/24 user@R0# set interfaces xe-0/0/1:0 unit 1 family iso user@R0# set interfaces xe-0/0/1:0 unit 1 family inet6 address 2001:db8::20:1:1:1/120 user@R0# set interfaces xe-0/0/1:0 unit 4 vlan-id 4 user@R0# set interfaces xe-0/0/1:0 unit 4 family inet address 172.20.2.1/24 user@R0# set interfaces xe-0/0/1:0 unit 4 family iso user@R0# set interfaces xe-0/0/1:0 unit 4 family inet6 address 2001:db8::20:2:1:1/120
-
Configure la interfaz de circuito cerrado con direcciones IPv4 e IPv6 que se utiliza como ID de enrutador para las sesiones BGP.
[edit] user@R0# set interfaces lo0 unit 0 family inet address 192.168.0.10/32 user@R0# set interfaces lo0 unit 0 family iso address 49.0001.000a.0a0a.0a00 user@R0# set interfaces lo0 unit 0 family inet6 address 2001:db8::10:10:10:10/32
-
Configure el ID del enrutador y el número de sistema autónomo (AS) para propagar la información de enrutamiento dentro de un conjunto de dispositivos de enrutamiento que pertenezcan al mismo AS.
[edit] user@R0# set routing-options router-id 10.10.10.10 user@R0# set routing-options autonomous-system 65550
-
Habilite SRv6 globalmente y la dirección del localizador para indicar la capacidad SRv6 del enrutador. SRv6 SID es una dirección IPv6 que consta del localizador y una función. Los protocolos de enrutamiento anuncian las direcciones del localizador.
[edit] user@R0# set routing-options source-packet-routing srv6 locator myloc 2001:db8:0:a0::/64
-
Configure la función End-Sid para los segmentos de prefijo. Especifique una versión, que es el comportamiento de la función End-SID según los requisitos de red. Penultimate Segment Pop (PSP), Ultimate Segment Pop (USP) y Ultimate Segment Decapsulation (USD) son los tres sabores disponibles para las funciones SRv6.
Nota:Asegúrese de que el localizador y el SID final estén en la misma subred para evitar que se cometa un error.
[edit] user@R0# set protocols isis source-packet-routing srv6 locator myloc end-sid 2001:db8:0:a0:d01:: flavor usd user@R0# set protocols isis source-packet-routing srv6 locator myloc1 end-sid 2001:db8:0:a10:d01:: flavor usd user@R0# set protocols isis source-packet-routing srv6 locator myloc2 end-sid 2001:db8:0:a20:d01:: flavor usd user@R0# set protocols isis source-packet-routing srv6 locator myloc3 end-sid 2001:db8:0:a30:d01:: flavor usd user@R0# set protocols isis source-packet-routing srv6 locator myloc4 end-sid 2001:db8:0:a40:d01:: flavor usp user@R0# set protocols isis source-packet-routing srv6 locator myloc4 end-sid 2001:db8:0:a40:d01:: flavor usd user@R0# set protocols isis level 1 disable
-
Configure la función End-X-SID en la interfaz punto a punto (P2P) para los segmentos de adyacencia. Especifique una o más versiones para el End-X-SID.
Nota:Asegúrese de que el localizador y End-X-SID estén en la misma subred para evitar un error de confirmación. Debe habilitar SRv6 y configurar el localizador antes de
Siempre que configure una[edit routing-options]asignar localizadores a interfaces.srv6-adjacency-segment, también debe configurar el localizador relacionado en la jerarquía, como se muestra en elprotocols isis source-packet-routing srv6 locatorpaso 5.[edit] user@R0# set protocols isis interface xe-0/0/0:0.0 level 2 srv6-adjacency-segment protected locator myloc end-x-sid 2001:db8:0:a0:1a01:: flavor usd user@R0# set protocols isis interface xe-0/0/0:0.0 level 2 srv6-adjacency-segment protected locator myloc1 end-x-sid 2001:db8:0:a10:1a01:: flavor usd user@R0# set protocols isis interface xe-0/0/0:0.0 level 2 srv6-adjacency-segment protected locator myloc2 end-x-sid 2001:db8:0:a20:1a01:: flavor usd user@R0# set protocols isis interface xe-0/0/0:0.0 level 2 srv6-adjacency-segment protected locator myloc3 end-x-sid 2001:db8:0:a30:1a01:: flavor usd user@R0# set protocols isis interface xe-0/0/0:0.0 level 2 srv6-adjacency-segment protected locator myloc4 end-x-sid 2001:db8:0:a40:1a01:: flavor usd user@R0# set protocols isis interface xe-0/0/0:0.0 node-link-protection user@R0# set protocols isis interface xe-0/0/0:0.0 point-to-point
-
Configure las opciones de SRv6 para el segmento de adyacencia de la interfaz LAN xe-0/0/0:2.0. Especifique una versión según sus requisitos de red. Penultimate Segment Pop (PSP), Ultimate Segment Pop (USP) y Ultimate Segment Decapsulation (USP) son los tres sabores disponibles para el segmento de adyacencia SRv6.
Nota:Asegúrese de que el localizador y End-X-Sid estén en la misma subred para evitar un error de confirmación. Debe habilitar SRv6 y configurar el localizador antes de
[edit routing-options]asignar localizadores a interfaces.[edit] user@R0# set protocols isis interface xe-0/0/0:2.0 level 2 lan-neighbor 0100.0404.0404 srv6-adjacency-segment unprotected locator myloc end-x-sid 2001:db8:0:a0:1a04:: flavor usd user@R0# set protocols isis interface xe-0/0/0:2.0 level 2 lan-neighbor 0100.0404.0404 srv6-adjacency-segment unprotected locator myloc1 end-x-sid 2001:db8:0:a10:1a04:: flavor usd user@R0# set protocols isis interface xe-0/0/0:2.0 level 2 lan-neighbor 0100.0404.0404 srv6-adjacency-segment unprotected locator myloc2 end-x-sid 2001:db8:0:a20:1a04:: flavor usd user@R0# set protocols isis interface xe-0/0/0:2.0 level 2 lan-neighbor 0100.0404.0404 srv6-adjacency-segment unprotected locator myloc3 end-x-sid 2001:db8:0:a30:1a04:: flavor usd user@R0# set protocols isis interface xe-0/0/0:2.0 level 2 lan-neighbor 0100.0404.0404 srv6-adjacency-segment unprotected locator myloc4 end-x-sid 2001:db8:0:a40:1a04:: flavor usd user@R0# set protocols isis interface xe-0/0/0:2.0 node-link-protection user@R0# set protocols isis interface xe-0/0/1:0.1 user@R0# set protocols isis interface fxp0.0 disable user@R0# set protocols isis interface lo0.0 passive
-
Configure BGP en la interfaz orientada al núcleo para establecer sesiones de emparejamiento internas.
[edit] user@R0# set protocols bgp group to-PEv6 type internal user@R0# set protocols bgp group to-PEv6 local-address abcd::10:10:10:10 user@R0# set protocols bgp group to-PEv6 neighbor abcd::2:2:2:2 family inet unicast extended-nexthop user@R0# set protocols bgp group to-PE2 type internal user@R0# set protocols bgp group to-PE2 local-address 10.10.10.10 user@R0# set protocols bgp group to-PE2 neighbor 2.2.2.2 family inet6 unicast user@R0# set protocols bgp group to-PE2 neighbor 2.2.2.2 family inet6-vpn unicast
-
Defina una política para equilibrar la carga de paquetes.
[edit] user@R0# set policy-options policy-statement pplb then load-balance per-packet
-
Aplique la política por paquete para habilitar el equilibrio de carga del tráfico.
[edit] user@R0# set routing-options forwarding-table export pplb
Resultados
Desde el modo de configuración, escriba los comandos , show protocolsshow policy-options, y show routing-options para confirmar la show interfacesconfiguración. Si el resultado no muestra la configuración deseada, repita las instrucciones de este ejemplo para corregir la configuración.
[edit]
user@R0# show interfaces
xe-0/0/0:0 {
description To_R1;
mtu 4000;
unit 0 {
family iso;
family inet6 {
address 2001:db8:1::1/64;
}
}
}
xe-0/0/0:2 {
description To_R4;
mtu 4000;
unit 0 {
family iso;
family inet6 {
address 2001:db8:4::1/64;
}
}
}
xe-0/0/1:0 {
description To_CE1;
unit 0 {
family inet {
address 172.16.10.2/24;
}
family iso;
}
}
lo0 {
unit 0 {
family iso {
address 49.0001.000a.0a0a.0a00;
}
family inet6 {
address 2001:db8:10:255::10/128;
}
}
}
[edit]
user@R0# show protocols
bgp {
group to-R2RRv6 {
type internal;
local-address 2001:db8:10:255::10;
export CE1_v4;
neighbor 2001:db8:2:255::2 {
family inet {
unicast {
extended-nexthop;
}
}
}
}
}
isis {
interface xe-0/0/0:0.0 {
level 2 {
srv6-adjacency-segment {
protected {
locator myloc {
end-x-sid 2001:db8:0:a0:1a01:: {
flavor psp;
}
}
}
}
}
node-link-protection;
point-to-point;
}
interface xe-0/0/0:2.0 {
level 2 {
srv6-adjacency-segment {
protected {
locator myloc {
end-x-sid 2001:db8:0:a0:1a04:: {
flavor psp;
}
}
}
}
}
node-link-protection;
point-to-point;
}
interface lo0.0 {
passive;
}
source-packet-routing {
srv6 {
locator myloc {
end-sid 2001:db8:0:a0:d01:: {
flavor {
usd;
}
}
}
}
}
level 1 disable;
}
[edit]
user@R0# show policy-options
policy-statement CE1_v4 {
term 1 {
from {
protocol direct;
route-filter 172.16.10.0/24 exact;
}
then {
next-hop 2001:db8:0:a0:d01::;
accept;
}
}
}
policy-statement pplb {
then {
load-balance per-packet;
}
}
[edit]
user@R0# show routing-options
source-packet-routing {
srv6 {
locator myloc 2001:db8:0:a0::/64;
}
}
forwarding-table {
export pplb;
}
router-id 172.16.255.10;
autonomous-system 65550;
Cuando termine de configurar el dispositivo, ingrese commit desde el modo de configuración.
Verificación
Confirme que la configuración funciona correctamente.
- Verificación de la adyacencia de IS-IS y de la sesión de IBGP
- Comprobar que SRv6 esté habilitado
- Verificar la configuración de SRv6 End-X-SID
- Verificar que la ruta del localizador esté instalada
- Verificación de que la ruta End-X-SID está instalada
- Comprobación de que la ruta de extremo SID está instalada
- Comprobar la configuración de SRv6 en la base de datos IS-IS
- La verificación de la ruta a CE2 utiliza un túnel SRv6
- Probar la conectividad IPv4 entre CE1 y CE2
Verificación de la adyacencia de IS-IS y de la sesión de IBGP
Propósito
Verifique las adyacencias de IS-IS y la sesión de IBGP en R2. R2 se elige para esta tarea porque tiene 5 adyacencias y también sirve como reflector del enrutador para el plano de control BGP.
Es una buena idea confirmar las adyacencias IS-IS en todos los enrutadores antes de continuar con los pasos de verificación restantes. Una implementación correcta de SRv6 requiere que el protocolo de puerta de enlace interior esté operativo en todos los nodos.
Acción
Desde el modo operativo, ejecute el comando en el show isis adjacency enrutador R2.
user@R2> show isis adjacency Interface System L State Hold (secs) SNPA xe-0/0/0:0.0 R1 2 Up 26 xe-0/0/0:1.0 R3 2 Up 25 xe-0/0/0:2.0 R4 2 Up 25 xe-0/0/0:3.0 R5 2 Up 24 xe-0/0/1:0.0 R6 2 Up 18
Desde el modo operativo, ejecute el comando en el show bgp summary enrutador R2.
user@R2> show bgp summary
Threading mode: BGP I/O
Default eBGP mode: advertise - accept, receive - accept
Groups: 1 Peers: 2 Down peers: 0
Table Tot Paths Act Paths Suppressed History Damp State Pending
inet.0
2 2 0 0 0 0
inet6.0
0 0 0 0 0 0
Peer AS InPkt OutPkt OutQ Flaps Last Up/Dwn State|#Active/Received/Accepted/Damped...
2001:db8:10:255::10 65550 3101 3092 0 0 23:14:18 Establ
inet.0: 1/1/1/0
2001:db8:20:255::20 65550 3091 3080 0 0 23:10:10 Establ
inet.0: 1/1/1/0
Significado
El resultado confirma el recuento de adyacencia IS-IS esperado para el enrutador R2. También confirma que R2 ha establecido sesiones BGP basadas en IPv6 para los enrutadores R0 y R7.
Comprobar que SRv6 esté habilitado
Propósito
Verifique que SRv6 esté habilitado con un localizador, End-SID y sabor en el enrutador R0.
Acción
Desde el modo operativo, ejecute el comando en el show isis overview enrutador R0.
user@R0> show isis overview
Instance: master
Router ID: 172.16.255.10
IPv6 Router ID: 2001:db8:1::1
Hostname: R0
Sysid: 0100.0a0a.0a0a
Areaid: 49.00
Adjacency holddown: enabled
Maximum Areas: 3
LSP life time: 1200
Attached bit evaluation: enabled
SPF delay: 200 msec, SPF holddown: 5000 msec, SPF rapid runs: 3
IPv4 is enabled, IPv6 is enabled
Traffic engineering: enabled
Restart: Disabled
Helper mode: Enabled
Layer2-map: Disabled
Source Packet Routing (SPRING): Enabled
Node Segments: Disabled
SRv6: Enabled
Locator: 2001:db8:0:a0::/64, Algorithm: 0
END-SID: 2001:db8:0:a0:d01::, Flavor: USD
Post Convergence Backup: Disabled
Level 1
Internal route preference: 15
External route preference: 160
Prefix export count: 0
Wide metrics are enabled, Narrow metrics are enabled
Source Packet Routing is enabled
Level 2
Internal route preference: 18
External route preference: 165
Prefix export count: 0
Wide metrics are enabled, Narrow metrics are enabled
Source Packet Routing is enabled
Significado
El localizador SRv6: Enabled Locator: 2001:db8:0:a0::/64, Algorithm: 0 SRv6 configurado y , End-SID y la versión END-SID: 2001:db8:0:a0:d01::, Flavor: USD se muestran en la salida.
Verificar la configuración de SRv6 End-X-SID
Propósito
Compruebe que una función y una versión de End-X-SID estén configuradas en R0.
Acción
Desde el modo operativo, ejecute el comando en el show isis adjacency detail enrutador R0.
user@R0> show isis adjacency detail
R1
Interface: xe-0/0/0:0.0, Level: 2, State: Up, Expires in 19 secs
Priority: 0, Up/Down transitions: 1, Last transition: 03:51:48 ago
Circuit type: 2, Speaks: IP, IPv6
Topologies: Unicast
Restart capable: Yes, Adjacency advertisement: Advertise
IP addresses: 192.168.255.1
IPv6 addresses: fe80::2e6b:f5ff:fedb:e800
IPv6 Global Interface Address: 2001:db8:1::2
Level 2 SRv6 protected END-X-SID: 2001:db8:0:a0:1a01::
Flavor: PSP, Flags: B-P, Algorithm: 0
R4
Interface: xe-0/0/0:2.0, Level: 2, State: Up, Expires in 20 secs
Priority: 0, Up/Down transitions: 1, Last transition: 03:48:04 ago
Circuit type: 2, Speaks: IP, IPv6
Topologies: Unicast
Restart capable: Yes, Adjacency advertisement: Advertise
IP addresses: 192.168.255.4
IPv6 addresses: fe80::2e6b:f5ff:feb4:4000
IPv6 Global Interface Address: 2001:db8:4::2
Level 2 SRv6 protected END-X-SID: 2001:db8:0:a0:1a04::
Flavor: PSP, Flags: B-P, Algorithm: 0
Significado
El campo SRv6 protected END-X-SID: 2001:db8:0:a0:1a01:: indica que se ha configurado la función End-X-SID con Flavor PSP en el enrutador R0 para la interfaz utilizada para conectar a R1. Se confirma una salida similar para la interfaz conectada a R4, que utiliza un End-X-SID diferente.
Verificar que la ruta del localizador esté instalada
Propósito
Compruebe que se ha instalado la ruta del localizador.
Acción
Desde el modo operativo, ejecute el comando en el show route 2001:db8:0:a0::/64 detail enrutador R0.
user@R0> show route 2001:db8:0:a0::/64 detail
inet6.0: 75 destinations, 75 routes (75 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both
2001:db8:0:a0::/64*[IS-IS/18] 3d 19:03:16, metric 0
Reject
user@R0> show route 2001:db8:0:a0::/64 detail
inet6.0: 45 destinations, 45 routes (45 active, 0 holddown, 0 hidden)
2001:db8:0:a0::/64 (1 entry, 1 announced)
*IS-IS Preference: 18
Level: 2
Next hop type: Reject, Next hop index: 0
Address: 0xc54526c
Next-hop reference count: 2
State: <Active Int OpaqueData>
Local AS: 65550
Age: 22:15:32 Metric: 0
Validation State: unverified
ORR Generation-ID: 0
Task: IS-IS
Announcement bits (2): 0-KRT 5-Resolve tree 5
AS path: I
. . .
Significado
El resultado confirma que la ruta 2001:db8:0:a0::/64*[IS-IS/18] del localizador está instalada en la inet6.0 tabla.
Verificación de que la ruta End-X-SID está instalada
Propósito
Para mostrar la información de ruta de End-X-SID configurada que se aplica en la interfaz.
Acción
Desde el modo operativo, ejecute el comando en el show route 2001:db8:0:a0:1a01:: enrutador R0.
user@R0> show route 2001:db8:0:a0:1a01::
inet6.0: 45 destinations, 45 routes (45 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both
2001:db8:0:a0::1a01/128
*[IS-IS/18] 04:33:42, metric 0
> to fe80::2e6b:f5ff:fedb:e800 via xe-0/0/0:0.0
Significado
El resultado confirma que la ruta 2001:db8:0:a0::1a01/128 End-X-SID está instalada en la inet.6.0 tabla de enrutamiento.
Comprobación de que la ruta de extremo SID está instalada
Propósito
Compruebe que las rutas End-SID para todos los enrutadores del dominio SRv6 estén instaladas en la inet6.3 tabla del enrutador R0.
Acción
Desde el modo operativo, ejecute el comando en el show route table inet6.3 protocol isis enrutador R0 para ver todos los SID finales que el enrutador ha aprendido. A continuación, muestre información detallada sobre el SID final asociado con el enrutador R7.
user@R0> show route table inet6.3 protocol isis
inet6.3: 7 destinations, 7 routes (7 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both
2001:db8:0:a1::d11/128
*[SRV6-ISIS/14] 04:39:22, metric 10
> to fe80::2e6b:f5ff:fedb:e800 via xe-0/0/0:0.0, SRV6-Tunnel, Dest: 2001:db8:0:a1:d11::
2001:db8:0:a2::d21/128
*[SRV6-ISIS/14] 04:35:38, metric 20
to fe80::2e6b:f5ff:fedb:e800 via xe-0/0/0:0.0, SRV6-Tunnel, Dest: 2001:db8:0:a2:d21::
> to fe80::2e6b:f5ff:feb4:4000 via xe-0/0/0:2.0, SRV6-Tunnel, Dest: 2001:db8:0:a2:d21::
2001:db8:0:a3::d31/128
*[SRV6-ISIS/14] 04:35:38, metric 30
to fe80::2e6b:f5ff:fedb:e800 via xe-0/0/0:0.0, SRV6-Tunnel, Dest: 2001:db8:0:a3:d31::
> to fe80::2e6b:f5ff:feb4:4000 via xe-0/0/0:2.0, SRV6-Tunnel, Dest: 2001:db8:0:a3:d31::
2001:db8:0:a4::d41/128
*[SRV6-ISIS/14] 04:35:38, metric 10
> to fe80::2e6b:f5ff:feb4:4000 via xe-0/0/0:2.0, SRV6-Tunnel, Dest: 2001:db8:0:a4:d41::
2001:db8:0:a5::d51/128
*[SRV6-ISIS/14] 04:35:01, metric 20
to fe80::2e6b:f5ff:fedb:e800 via xe-0/0/0:0.0, SRV6-Tunnel, Dest: 2001:db8:0:a5:d51::
> to fe80::2e6b:f5ff:feb4:4000 via xe-0/0/0:2.0, SRV6-Tunnel, Dest: 2001:db8:0:a5:d51::
2001:db8:0:a6::d61/128
*[SRV6-ISIS/14] 04:34:32, metric 30
to fe80::2e6b:f5ff:fedb:e800 via xe-0/0/0:0.0, SRV6-Tunnel, Dest: 2001:db8:0:a6:d61::
> to fe80::2e6b:f5ff:feb4:4000 via xe-0/0/0:2.0, SRV6-Tunnel, Dest: 2001:db8:0:a6:d61::
2001:db8:0:a7::d71/128
*[SRV6-ISIS/14] 04:33:00, metric 40
to fe80::2e6b:f5ff:fedb:e800 via xe-0/0/0:0.0, SRV6-Tunnel, Dest: 2001:db8:0:a7:d71::
> to fe80::2e6b:f5ff:feb4:4000 via xe-0/0/0:2.0, SRV6-Tunnel, Dest: 2001:db8:0:a7:d71::
user@R0> show route 2001:db8:0:a7::d71/128 detail
inet6.3: 7 destinations, 7 routes (7 active, 0 holddown, 0 hidden)
2001:db8:0:a7::d71/128 (1 entry, 1 announced)
*SRV6-ISIS Preference: 14
Level: 2
Next hop type: List, Next hop index: 1048577
Address: 0xdb8deb4
Next-hop reference count: 6
Next hop: ELNH Address 0xc5462d4 weight 0x1
Next hop type: Chain, Next hop index: 582
Address: 0xc5462d4
Next-hop reference count: 1
Next hop: ELNH Address 0xc545bcc
SRV6-Tunnel: Reduced-SRH Encap-mode
Src: 2001:db8:1::1 Dest: 2001:db8:0:a7::d71
Segment-list[0] 2001:db8:0:a7:d71::
Next hop type: Router, Next hop index: 580
Address: 0xc545bcc
Next-hop reference count: 9
Next hop: fe80::2e6b:f5ff:fedb:e800 via xe-0/0/0:0.0 weight 0x1
Next hop: ELNH Address 0xc546338 weight 0x1, selected
Next hop type: Chain, Next hop index: 583
Address: 0xc546338
Next-hop reference count: 1
Next hop: ELNH Address 0xc545f50
SRV6-Tunnel: Reduced-SRH Encap-mode
Src: 2001:db8:1::1 Dest: 2001:db8:0:a7:d71::
Segment-list[0] 2001:db8:0:a7:d71::
Next hop type: Router, Next hop index: 581
Address: 0xc545f50
Next-hop reference count: 9
Next hop: fe80::2e6b:f5ff:feb4:4000 via xe-0/0/0:2.0 weight 0x1
State: <Active NoReadvrt Int OpaqueData>
Local AS: 65550
Age: 4:35:43 Metric: 40
Validation State: unverified
ORR Generation-ID: 0
Task: IS-IS
Announcement bits (3): 0-Resolve tree 2 1-Resolve tree 5 2-Resolve_IGP_FRR task
AS path: I
Session-IDs associated:
Session-id: 322 Version: 0
Significado
El resultado confirma que el enrutador R0 aprendió los SID, es decir, 2001:db8:0:a1::d11/128 y 2001:db8:0:a2::d21/128, de todos los demás enrutadores de la topología. Nota Los SID finales se han instalado en la inet6.3 tabla. La salida detallada para el SID final anunciada por R7 2001:db8:0:a7:d71:: confirma que se ha establecido un túnel SRv6 entre el enrutador R0 y el enrutador R7.
Tenga en cuenta que la lista de segmentos se rellena con el valor End-SID configurado en el enrutador R7. Recuerde que todos los SID finales en este ejemplo están configurados con la versión Ultimate Segment Decapsulate (USD). Es la combinación de un End-SID local y la versión USD asociada lo que le indica a R7 que es la salida del túnel IPv6. Una vez recibido, R7 desencapsula el paquete IPv4 y lo enruta de acuerdo con la dirección de destino IPv4.
Comprobar la configuración de SRv6 en la base de datos IS-IS
Propósito
Muestre la base de datos IS-IS para verificar el SID final y la versión configurados en el enrutador R7. En este ejemplo, el comando se ejecuta en el enrutador R0. Se espera una salida similar en todos los enrutadores porque la base de datos IS-IS se replica en todos los nodos.
Acción
Desde el modo operativo, ejecute el comando en el show isis database R7.00-00 extensive enrutador R0.
user@R0> show isis database R.00-00 extensive
IS-IS level 1 link-state database:
IS-IS level 2 link-state database:
R7.00-00 Sequence: 0x31f, Checksum: 0x2ce6, Lifetime: 904 secs
IS neighbor: R3.00 Metric: 10
Two-way fragment: R3.00-00, Two-way first fragment: R3.00-00
IS neighbor: R6.00 Metric: 10
Two-way fragment: R6.00-00, Two-way first fragment: R6.00-00
V6 prefix: 2001:db8::/32 Metric: 0 Internal Up
V6 prefix: 2001:db8:0:a7::/64 Metric: 0 Internal Up
V6 prefix: 2001:db8:20:255::20/128 Metric: 0 Internal Up
V6 prefix: 2001:db8:37::/64 Metric: 10 Internal Up
V6 prefix: 2001:db8:67::2/128 Metric: 10 Internal Up
Header: LSP ID: R7.00-00, Length: 445 bytes
Allocated length: 746 bytes, Router ID: 172.16.255.20
Remaining lifetime: 904 secs, Level: 2, Interface: 360
Estimated free bytes: 0, Actual free bytes: 301
Aging timer expires in: 904 secs
Protocols: IP, IPv6
Packet: LSP ID: R7.00-00, Length: 445 bytes, Lifetime : 1192 secs
Checksum: 0x2ce6, Sequence: 0x31f, Attributes: 0x3 <L1 L2>
NLPID: 0x83, Fixed length: 27 bytes, Version: 1, Sysid length: 0 bytes
Packet type: 20, Packet version: 1, Max area: 0
TLVs:
Area address: 49.00 (2)
LSP Buffer Size: 1492
Speaks: IP
Speaks: IPV6
IP router id: 172.16.255.20
IP address: 172.16.255.20
IPv6 TE Router ID: 2001:db8:20:255::20
Hostname: R7
SRv6 Locator: 2001:db8:0:a7::/64, Metric: 0, MTID: 0, Flags: 0x0, Algorithm: 0
SRv6 SID: 2001:db8:0:a7:d71::, Flavor: USD
IPv6 prefix: 2001:db8:20:255::20/128 Metric 0 Up
IPv6 prefix: 2001:db8::/32 Metric 0 Up
IPv6 prefix: 2001:db8:0:a7::/64 Metric 0 Up
IPv6 prefix: 2001:db8:37::/64 Metric 10 Up
IPv6 prefix: 2001:db8:67::2/128 Metric 10 Up
Router Capability: Router ID 172.16.255.20, Flags: 0x00
SPRING Algorithm - Algo: 0
SRv6 Capability - Flags: 0
Node MSD Advertisement Sub-TLV:Type: 23, Length: 10
SRv6 Maximum Segments Left MSD:Type: 41, Value: 6
SRv6 Maximum Pop MSD:Type: 42, Value: 7
SRv6 Maximum Insert MSD:Type: 43, Value: 5
SRv6 Maximum Encap MSD:Type: 44, Value: 6
SRv6 Maximum End D MSD:Type: 45, Value: 6
IPv6 TE Router Id: 2001:db8:20:255::20
IS neighbor: R6.00, Internal, Metric: default 10
IS neighbor: R3.00, Internal, Metric: default 10
Extended IS Reachability TLV, Type: 22, Length: 174
IS extended neighbor: R6.00, Metric: default 10 SubTLV len: 76
IPv6 address: 2001:db8:67::2
Neighbor's IP address: 192.168.255.6
Neighbor's IPv6 address: 2001:db8:67::1
Local interface index: 361, Remote interface index: 364
P2P SRV6 END-X-SID:2001:db8:0:a7:1a76:: , Flags:B-P, Weight:0, Algorithm:0
Flags:0xa0(B:1,S:0,P:1), Flavor: PSP
IS extended neighbor: R3.00, Metric: default 10 SubTLV len: 76
IPv6 address: 2001:db8:37::2
Neighbor's IP address: 192.168.255.3
Neighbor's IPv6 address: 2001:db8:37::1
Local interface index: 360, Remote interface index: 336
P2P SRV6 END-X-SID:2001:db8:0:a7:1a73:: , Flags:B-P, Weight:0, Algorithm:0
Flags:0xa0(B:1,S:0,P:1), Flavor: PSP
No queued transmissions
Significado
La presencia de SRv6 SID: 2001:db8:0:a7:d71:: con Flavor: USD confirma que SRv6 está habilitado con una versión de desencapsulado SID en el enrutador R7. El resultado también muestra que las interfaces en R7 se han configurado para la protección TI-LFA utilizando una versión PSP.
La verificación de la ruta a CE2 utiliza un túnel SRv6
Propósito
Muestre la ruta a la subred IPv4 en R7 para confirmar que el siguiente salto apunta a un túnel SRv6.
Acción
Desde el modo operativo, ejecute el comando en el show route 172.16.20.0/24 enrutador R0.
user@R0> show route 172.16.20.0/24
inet.0: 36 destinations, 36 routes (36 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both
172.16.20.0/24 *[BGP/170] 05:20:58, localpref 100, from 2001:db8:2:255::2
AS path: I, validation-state: unverified
to fe80::2e6b:f5ff:fedb:e800 via xe-0/0/0:0.0, SRV6-Tunnel, Dest: 2001:db8:0:a7:d71::
> to fe80::2e6b:f5ff:feb4:4000 via xe-0/0/0:2.0, SRV6-Tunnel, Dest: 2001:db8:0:a7:d71::
Significado
El resultado confirma que R0 ha aprendido la ruta a la subred a través 172.16.20.0/24 de su sesión BGP a R2, cuya recuperación se configura como un reflector de ruta en este ejemplo. Los siguientes saltos confirman que se ha instalado un túnel SRv6 al enrutador R7 para esta ruta. Dos saltos siguientes están disponibles de acuerdo con que son dos rutas de igual costo entre los enrutadores R0 y R7 en la topología de ejemplo.
Probar la conectividad IPv4 entre CE1 y CE2
Propósito
Genere pings para comprobar la conectividad IPv4 entre los dispositivos CE a través del núcleo del proveedor IPv6.
Acción
Desde el modo operativo, ejecute el comando en el ping 172.16.20.2 source 172.16.10.2 count 2 enrutador R0.
user@R0> ping 172.16.20.2 source 172.16.10.2 count 2 PING 172.16.20.2 (172.16.20.2): 56 data bytes 64 bytes from 172.16.20.2: icmp_seq=0 ttl=64 time=114.922 ms 64 bytes from 172.16.20.2: icmp_seq=1 ttl=64 time=89.558 ms --- 172.16.20.2 ping statistics --- 2 packets transmitted, 2 packets received, 0% packet loss round-trip min/avg/max/stddev = 89.558/102.240/114.922/12.682 ms
Significado
El resultado confirma que la conectividad IPv4 funciona entre las redes de dispositivos CE. Esto proporciona la comprobación de que el túnel SRv6 sobre un núcleo de proveedor IPv6 funciona correctamente en este ejemplo.