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L3 Routing Protocols
SUMMARY Read this topic to know about the L3 routing protocols that are supported by the Juniper Cloud Native Router, including BGP, IS-IS, and OSPF.
Supported L3 protocols
The Juniper Cloud-Native router supports the following L3 routing protocols, each of which can be configured via node annotations at the time of deployment or via the cRPD CLI for a running cRPD pod. Here is an example configuration snippet from the go template with node annotations:
protocols {
isis {
interface all;
{{if and .Env.SRGB_START_LABEL .Env.SRGB_INDEX_RANGE}}
source-packet-routing {
srgb start-label {{.Env.SRGB_START_LABEL}} index-range {{.Env.SRGB_INDEX_RANGE}};
node-segment {
{{if .Node.srIPv4NodeIndex}}
ipv4-index {{.Node.srIPv4NodeIndex}};
{{end}}
{{if .Node.srIPv6NodeIndex}}
ipv6-index {{.Node.srIPv6NodeIndex}};
{{end}}
}
}
{{end}}
level 1 disable;
}
}BGP
BGP is an exterior gateway protocol (EGP) that is used to exchange routing information among routers in different autonomous systems (ASs). BGP routing information includes the complete route to each destination. BGP uses the routing information to maintain a database of network reachability information, which it exchanges with other BGP systems. BGP uses the network reachability information to construct a graph of AS connectivity, which enables BGP to remove routing loops and enforce policy decisions at the AS level. The cloud-native router supports BGP version 4. Here is an example to configure BGP protocol on the cloud-native router via the cRPD shell:set protocols bgp group CNI type internal set protocols bgp group CNI local-address 10.0.0.1 set protocols bgp group CNI family inet-vpn unicast set protocols bgp group CNI family inet6-vpn unicast set protocols bgp group CNI neighbor 10.0.1.1 peer-as 64512 set protocols bgp group CNI neighbor 10.0.1.1 local-as 64512 set routing-options route-distinguisher-id 10.0.0.1
show bgp summary command on the cRPD shell to view the BGP
summary information for all routing instances. For
example:user@host> show bgp summary
Threading mode: BGP I/O
Default eBGP mode: advertise - accept, receive - accept
Groups: 1 Peers: 1 Down peers: 0
Table Tot Paths Act Paths Suppressed History Damp State Pending
bgp.l3vpn.0
2 2 0 0 0 0
bgp.l3vpn-inet6.0
2 2 0 0 0 0
Peer AS InPkt OutPkt OutQ Flaps Last Up/Dwn State|#Active/Received/Accepted/Damped...
10.0.1.1 64512 249 211 0 0 1:32:42 Establ
bgp.l3vpn.0: 2/2/2/0
bgp.l3vpn-inet6.0: 2/2/2/0
jcnr-3.inet.0: 2/2/2/0
jcnr-3.inet6.0: 2/2/2/0IS-IS
The IS-IS protocol is an interior gateway protocol (IGP) that uses link-state information to make routing decisions. IS-IS is a link-state IGP that uses the shortest-path-first (SPF) algorithm to determine routes. IS-IS evaluates the topology changes and determines whether to perform a full SPF recalculation or a partial route calculation (PRC). IS-IS uses hello packets that allow network convergence to occur quickly when network changes are detected. The cloud-native router supports IS-IS.
Here is an example to configure IS-IS protocol on the cloud-native router via the cRPD shell:
set security forwarding-options family iso mode packet-based set interfaces eno3v0 unit 0 family inet address 10.100.12.1/30 set interfaces eno3v0 unit 0 family iso set interfaces lo0 unit 0 family inet address 192.168.0.1/32 set interfaces lo0 unit 0 family iso address 49.0002.0192.0168.0001.00 set protocols isis interface eno3v0 set protocols isis interface lo0.0
You can issue the show isis adjacency and show isis
interface commands to verify the protocol configuration. Refer the IS-IS User Guide for information.
OSPF
OSPF is an interior gateway protocol (IGP) that routes packets within a single autonomous system (AS). OSPF uses link-state information to make routing decisions, making route calculations using the shortest-path-first (SPF) algorithm (also referred to as the Dijkstra algorithm). Each router running OSPF floods link-state advertisements throughout the AS or area that contain information about that router’s attached interfaces and routing metrics. Each router uses the information in these link-state advertisements to calculate the least cost path to each network and create a routing table for the protocol. The cloud-native router supports OSPF version 2 (OSPFv2) and OSPF version 3 (OSPFv3). Here is an example to configure IS-IS protocol on the cloud-native router via the cRPD shell:
set protocols ospf area 0.0.0.0 interface bond0 set protocols ospf area 0.0.0.0 interface lo passive
Once you bring up the pods, verify the OSPF configuration:
show ospf neighbor Address Interface State ID Pri Dead 192.168.123.254 bond0 Full 123.1.1.254 128 36
show route 1.1.24.24
inet.0: 27 destinations, 29 routes (27 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both
1.1.24.24/32 *[OSPF/10] 00:07:08, metric 2
> to 192.168.123.254 via bond0Refer the OSPF User Guide for more information.