Exemplo: Configuração da proteção de enlaces LSP MPLS
Figura 1: Diagrama da topologia de proteção de enlaces MPLS LSP
Na Figura 1, um MPLS LSP primário é estabelecido desde o roteador 1 até o roteador 3 até o roteador de destino 2. Para implementar a proteção de enlaces, inclua a link-protection declaração sobre o LSP primário no ponto de entrada e sobre as interfaces RSVP downstream apropriadas que você deseja proteger. Neste caso, o LSP principal indicado Protected_LSP no Roteador 1 requer proteção de enlaces, assim como a so-7/3/2 interface RSVP do Roteador 1 e a so-6/0/0 interface RSVP do Roteador 3. Após a proteção do link ser habilitada para o LSP protegido, os LSPs de bypass são estabelecidos automaticamente para as interfaces transversais de LSP dos Roteadores 1 e 3.
No Roteador 1, configure um protocolo de roteamento de protocolo de gateway interior (IGP) (neste caso, IS-IS), RSVP e MPLS nas interfaces e so-7/3/2 nas so-0/0/0 interfaces. Em seguida, configure o LSP primário no roteador 1 para apontar para o endereço de loopback do Roteador 2. O caminho rigoroso do LSP principal deve percorrer o Roteador 3.
Habilite a proteção de links tanto no próprio LSP quanto na interface RSVP de saída atravessada pelo LSP primário (neste caso, a so-7/3/2 interface RSVP do Roteador 1). Depois de habilitar a proteção de enlaces, o roteador percebe que o LSP primário está protegido e prepara um LSP de bypass.
Configure uma rota estática do 10.31.5.1 LSP no Roteador 1. Você pode usar essa rota para fins de teste. Além disso, se você quiser habilitar o reparo local do Mecanismo de encaminhamento de pacotes, estabeleça uma política que exija que todo o tráfego use balanceamento de carga por pacote. Assim que esta política estiver configurada, exporte-a para os roteadores vizinhos com a export declaração no nível [edit routing-options forwarding-table] hierarquia.]
Roteador 1
[edit]
interfaces {
so-0/0/0 {
unit 0 {
family inet {
address 10.31.3.1/30;
}
family iso;
family mpls;
}
}
so-7/3/2 {
unit 0 {
family inet {
address 10.31.1.1/30;
}
family iso;
family mpls;
}
}
lo0 {
unit 0 {
family inet {
address 10.245.71.51/32;
}
family iso {
}
}
}
protocols {
rsvp {
interface so-7/3/2.0 {
link-protection; # Enable link protection on the interface carrying the main LSP.
}
interface so-0/0/0.0 {
}
mpls {
label-switched-path Protected_LSP {
to 10.245.71.52;
install 10.31.5.1/32 active; # This route is used for testing the LSPs.
link-protection; # Enable link protection on the protected LSP.
primary path1;
}
path path1 {
10.31.1.2 strict;
}
interface so-0/0/0.0;
interface so-7/3/2.0;
}
isis {
level 2 wide-metrics-only;
interface so-0/0/0.0 {
level 1 disable;
level 2 {
metric 100;
te-metric 100;
}
}
interface so-7/3/2.0 {
level 1 disable;
level 2 {
metric 10;
te-metric 10;
}
}
interface lo0.0 {
passive;
}
}
}
routing-options {
forwarding-table { # Apply this policy to the forwarding table only
export pplb; # if Packet Forwarding Engine local repair is needed.
}
}
policy-options {
policy-statement pplb {
then {# Configure this policy only if
load-balance per-packet; # Packet Forwarding Engine local repair is needed.
}
}
}
}
}
No Roteador 2, nenhuma configuração de proteção de link é necessária. No entanto, você deve configurar MPLS, RSVP e IS-IS para se comunicar com os outros roteadores.
Roteador 2
[edit]
interfaces {
so-0/0/0 {
unit 0 {
family inet {
address 10.31.3.2/30;
}
family iso;
family mpls;
}
}
so-7/1/0 {
unit 0 {
family inet {
address 10.31.2.1/30;
}
family iso;
family mpls;
}
}
lo0 {
unit 0 {
family inet {
address 10.245.71.53/32;
}
family iso {
}
}
}
protocols {
rsvp {
interface so-0/0/0.0;
interface so-7/1/0.0;
}
mpls {
interface so-0/0/0.0;
interface so-7/1/0.0;
}
isis {
level 2 wide-metrics-only;
interface so-0/0/0.0 {
level 1 disable;
level 2 {
metric 100;
te-metric 100;
}
}
interface so-7/1/0.0 {
level 1 disable;
level 2 {
metric 10;
te-metric 10;
}
}
interface lo0.0 {
passive;
}
}
}
}
No Roteador 3, incluem IS-IS, RSVP e MPLS nas so-1/0/0 interfaces. so-6/0/0 Habilite a proteção de links na interface RSVP restante atravessada pelo LSP primário (neste caso, a so-6/0/0 interface RSVP). Depois de habilitar a proteção de enlaces, o roteador percebe que o LSP primário está protegido e prepara um LSP de bypass.
Para habilitar o reparo local do Mecanismo de encaminhamento de pacotes, estabeleça uma política que exige que o tráfego use balanceamento de carga por pacote. Assim que esta política estiver configurada, exporte-a para os roteadores vizinhos.
Roteador 3
[edit]
interfaces {
so-1/0/0 {
unit 0 {
family inet {
address 10.31.1.2/30;
}
family iso;
family mpls;
}
}
so-6/0/0 {
unit 0 {
family inet {
address 10.31.2.2/30;
}
family iso;
family mpls;
}
}
lo0 {
unit 0 {
family inet {
address 10.245.271.53/32;
}
family iso {
}
}
}
protocols {
rsvp {
interface so-1/0/0.0;
interface so-6/0/0.0 { # Primary interface going to Router 2.
link-protection;
}
}
mpls {
interface so-1/0/0.0;
interface so-6/0/0.0;
}
isis {
level 2 wide-metrics-only;
interface so-1/0/0.0 {
level 1 disable;
level 2 {
metric 10;
te-metric 10;
}
}
interface so-6/0/0.0 {
level 1 disable;
level 2 {
metric 10;
te-metric 10;
}
}
interface lo0.0 {
passive;
}
}
}
policy-options {
policy-statement pplb {
then {
load-balance per-packet; # If Packet Forwarding Engine local repair is needed.
}
}
}
routing-options {
forwarding-table {
export pplb; # If Packet Forwarding Engine local repair is needed.
}
}
}
Verificando seu trabalho
Para verificar a operação adequada da proteção de enlaces LSP do MPLS, use os seguintes comandos:
show mpls lspshow routeshow route forwarding-tableshow rsvp interface detailshow rsvp neighbor detailshow rsvp session detail
As seções a seguir mostram a saída desses comandos usados com o exemplo de configuração:
- Caso 1: Operação normal
- Caso 2: quando o link do roteador 1 para o roteador 3 estiver desativado
- Caso 3: quando o link do roteador 3 para o roteador 2 for desativado
Caso 1: Operação normal
Assim que a proteção do link for habilitada nas interfaces RSVP necessárias e LSP primário, os LSPs de bypass estão preparados.
Roteador 1
user@Router1> show mpls lsp Ingress LSP: 1 sessions To From State Rt ActivePath P LSPname 10.245.71.52 10.245.71.51 Up 1 path1 * Protected_LSP
Este é o LSP principal.
Total 1 displayed, Up 1, Down 0 Egress LSP: 0 sessions Total 0 displayed, Up 0, Down 0 Transit LSP: 1 sessions To From State Rt Style Labelin Labelout LSPname 10.245.71.52 10.245.271.53 Up 1 1 SE 100003 0 Bypass->10.31.2.1
Este é o LSP de bypass do Roteador 3 ao Roteador 2.
Total 1 displayed, Up 1, Down 0 user@Router1> show rsvp session detail Ingress RSVP: 2 sessions 10.245.71.52 From: 10.245.71.51, LSPstate: Up, ActiveRoute: 1 LSPname: Protected_LSP
Este é o LSP principal. Observe que um LSP de backup não é sinalizado quando o LSP principal ainda está em alta.
Resv style: 1 SE, Label in: -, Label out: 100007 Time left: -, Since: Thu Aug 8 12:13:24 2002 Tspec: rate 0bps size 0bps peak Infbps m 20 M 1500 Port number: sender 2 receiver 33 protocol 0 Link protection desired Type: Link protected LSP PATH rcvfrom: localclient PATH sentto: 10.31.1.2 (so-7/3/2.0) 36 pkts RESV rcvfrom: 10.31.1.2 (so-7/3/2.0) 38 pkts Explct route: 10.31.1.2 10.31.2.1 Record route: <self> 10.31.1.2 10.31.2.1 10.245.271.53 From: 10.245.71.51, LSPstate: Up, ActiveRoute: 0 LSPname: Bypass->10.31.1.2
Este é o desvio do Roteador 1 para o Roteador 2. Isso também aparece na show mpls lsp saída de comando acima.
Resv style: 1 SE, Label in: -, Label out: 100000
Time left: -, Since: Thu Aug 8 12:14:31 2002
Tspec: rate 0bps size 0bps peak Infbps m 20 M 1500
Port number: sender 1 receiver 51 protocol 0
Type: Bypass LSP
PATH rcvfrom: localclient
PATH sentto: 10.31.3.2 (so-0/0/0.0) 32 pkts
RESV rcvfrom: 10.31.3.2 (so-0/0/0.0) 32 pkts
Explct route: 10.31.3.2 10.31.2.2
Record route: <self> 10.31.3.2 10.31.2.2
Total 2 displayed, Up 2, Down 0
Egress RSVP: 0 sessions
Total 0 displayed, Up 0, Down 0
Transit RSVP: 1 sessions
10.245.71.52
From: 10.245.271.53, LSPstate: Up, ActiveRoute: 1
LSPname: Bypass->10.31.2.1
Resv style: 1 SE, Label in: 100003, Label out: 0
Time left: 52, Since: Thu Aug 8 12:03:27 2002
Tspec: rate 0bps size 0bps peak Infbps m 20 M 1500
Port number: sender 1 receiver 19 protocol 0
PATH rcvfrom: 10.31.1.2 (so-7/3/2.0) 76 pkts
PATH sentto: 10.31.3.2 (so-0/0/0.0) 77 pkts
RESV rcvfrom: 10.31.3.2 (so-0/0/0.0) 78 pkts
Explct route: 10.31.3.2
Record route: 10.31.1.2 <self> 10.31.3.2
Total 1 displayed, Up 1, Down 0
user@Router1> show rsvp interface detail
RSVP interface: 2 active
fxp0.0 Index 1, State Dis/Up
NoAuthentication, NoAggregate, NoReliable, NoLinkProtection
HelloInterval 9(second)
Address 192.168.71.52
PacketType Total Last 5 seconds
Sent Received Sent Received
Path 0 0 0 0
PathErr 0 0 0 0
PathTear 0 0 0 0
Resv 0 0 0 0
ResvErr 0 0 0 0
ResvTear 0 0 0 0
Hello 0 0 0 0
Ack 0 0 0 0
Srefresh 0 0 0 0
EndtoEnd RSVP 0 0 0 0
so-0/0/0.0 Index 8, State Ena/Up
NoAuthentication, NoAggregate, NoReliable, NoLinkProtection
HelloInterval 20(second)
Address 10.31.3.1, 10.245.71.51
ActiveResv 2, PreemptionCnt 0, Update threshold 10%
Subscription 100%, StaticBW 622.08Mbps, AvailableBW 622.08Mbps
PacketType Total Last 5 seconds
Sent Received Sent Received
Path 441 0 0 0
PathErr 0 0 0 0
PathTear 3 0 0 0
Resv 0 431 0 0
ResvErr 0 0 0 0
ResvTear 0 0 0 0
Hello 489 487 0 0
Ack 0 0 0 0
Srefresh 0 0 0 0
EndtoEnd RSVP 0 0 0 0
so-7/3/2.0 Index 11, State Ena/Up
NoAuthentication, NoAggregate, NoReliable, LinkProtection
A proteção de enlaces está ativada.
HelloInterval 3(second)
Address 10.31.1.1, 10.245.71.51
ActiveResv 1, PreemptionCnt 0, Update threshold 10%
Subscription 100%, StaticBW 2.48832Gbps, AvailableBW 2.48832Gbps
PacketType Total Last 5 seconds
Sent Received Sent Received
Path 225 138 0 0
PathErr 12 4 0 0
PathTear 5 3 0 0
Resv 134 216 0 1
ResvErr 0 0 0 0
ResvTear 3 1 0 0
Hello 750 799 1 1
Ack 0 0 0 0
Srefresh 0 0 0 0
EndtoEnd RSVP 0 0 0 0
user@Router1> show rsvp neighbor detail
RSVP neighbor: 2 learned
Address: 10.31.1.2 via: so-7/3/2.0 status: Up
Last changed time: 38:17, Idle: 5 sec, Up cnt: 1, Down cnt: 0
Message received: 329
Hello: sent 747, received: 747, interval: 3 sec
Remote instance: 0x41b21a47, Local instance: 0x238fa919
Refresh reduction: not operational
Link protection: enabled # This should be enabled
LSP name: Bypass->10.31.1.2
Bypass LSP: operational, Backup routes: 2 , Backup LSPs: 0
O número de rotas de backup é igual a 2 porque o LSP principal já é considerado para proteção.
Bypass explicit route: 10.31.3.2 10.31.2.2
Address: 10.31.3.2 via: so-0/0/0.0 status: Up
Last changed time: 17:46, Idle: 5 sec, Up cnt: 4, Down cnt: 3
Message received: 430
Hello: sent 506, received: 486, interval: 20 sec
Remote instance: 0x194fa7af, Local instance: 0x507b7c2a
Refresh reduction: not operational
Link protection: disabled
Bypass LSP: does not exist, Backup routes: 0, Backup LSPs: 0
user@Router1>show route 10.31.5.1 extensive
inet.0: 24 destinations, 24 routes (22 active, 0 holddown, 2 hidden)
10.31.5.1/32 (1 entry, 1 announced)
State: <FlashAll>
TSI:
KRT in-kernel 10.31.5.1/32 -> {0.0.0.0, 0.0.0.0}
*RSVP Preference: 7
Next hop: via so-7/3/2.0 weight 1, selected
Este é o LSP principal.
Label-switched-path Protected_LSP
Label operation: Push 100007
Next hop: via so-0/0/0.0 weight 20001
Esta é uma rota de backup, embora o LSP de backup ainda não tenha sido sinalizado.
Label-switched-path Bypass->10.31.1.2
Label operation: Push 100007, Push 100000(top)[0]
State: <Active Int>
Local AS: 69
Age: 8:34 Metric: 20
Task: RSVP
Announcement bits (1): 0-KRT
AS path: I
user@Router1> show route forwarding-table destination 10.31.5.1 extensive
Routing table: inet [Index 0]
Internet:
Destination: 10.31.5.1/32
Route type: user Route reference: 0
Flags: sent to PFE
Next-hop type: unilist Index: 39 Reference: 1
Next-hop type: Push 100007
Next-hop interface: so-7/3/2.0 Weight: 1
O reparo local do mecanismo de encaminhamento de pacotes é habilitado (caso contrário, apenas uma entrada aparece).Next-hop
Next-hop type: Push 100007, Push 100000(top)[0] Next-hop interface: so-0/0/0.0 Weight: 20001
O valor de peso para o backup começa em 20000.
Roteador 3
user@Router3> show mpls lsp Ingress LSP: 0 sessions
A entrada ignora o LSP para o roteador 2 não aparece aqui.
Total 0 displayed, Up 0, Down 0 Egress LSP: 1 sessions To From State Rt Style Labelin Labelout LSPname 10.245.271.53 10.245.71.51 Up 0 1 SE 3 - Bypass->10.31.1.2 Total 1 displayed, Up 1, Down 0 Transit LSP: 1 sessions To From State Rt Style Labelin Labelout LSPname 10.245.71.52 10.245.71.51 Up 1 1 SE 100000 0 Protected_LSP Total 1 displayed, Up 1, Down 0 user@Router3> show rsvp session detail Ingress RSVP: 1 sessions 10.245.71.52 From: 10.245.271.53, LSPstate: Up, ActiveRoute: 0 LSPname: Bypass->10.31.2.1
Esta é a sessão de bypass de entrada para o Roteador 2 do Roteador 1.
Suggested label received: -, Suggested label sent: - Recovery label received: -, Recovery label sent: 100004 Resv style: 1 SE, Label in: -, Label out: 100004 Time left: -, Since: Thu Aug 8 12:27:07 2002 Tspec: rate 0bps size 0bps peak Infbps m 20 M 1500 Port number: sender 1 receiver 16 protocol 0 Type: Bypass LSP PATH rcvfrom: localclient PATH sentto: 10.31.1.1 (so-1/0/0.0) 3 pkts RESV rcvfrom: 10.31.1.1 (so-1/0/0.0) 3 pkts Explct route: 10.31.1.1 10.31.3.2 Record route: <self> 10.31.1.1 10.31.3.2 Total 1 displayed, Up 1, Down 0 Egress RSVP: 1 sessions 10.245.271.53 From: 10.245.71.51, LSPstate: Up, ActiveRoute: 0 LSPname: Bypass->10.31.1.2
Este é o desvio do Roteador 1 para o Roteador 3, chegando por meio do Roteador 2.
Suggested label received: -, Suggested label sent: - Recovery label received: -, Recovery label sent: - Resv style: 1 SE, Label in: 3, Label out: - Time left: 54, Since: Thu Aug 8 12:26:48 2002 Tspec: rate 0bps size 0bps peak Infbps m 20 M 1500 Port number: sender 1 receiver 52 protocol 0 PATH rcvfrom: 10.31.2.1 (so-6/0/0.0) 5 pkts PATH sentto: localclient RESV rcvfrom: localclient Record route: 10.31.3.1 10.31.2.1 <self> Total 1 displayed, Up 1, Down 0 Transit RSVP: 1 sessions 10.245.71.52 From: 10.245.71.51, LSPstate: Up, ActiveRoute: 1 LSPname: Protected_LSP
Este é o LSP principal.
Suggested label received: -, Suggested label sent: -
Recovery label received: -, Recovery label sent: 0
Resv style: 1 SE, Label in: 100000, Label out: 0
Time left: 41, Since: Thu Aug 8 12:26:39 2002
Tspec: rate 0bps size 0bps peak Infbps m 20 M 1500
Port number: sender 2 receiver 33 protocol 0
Link protection desired
Type: Link protected LSP
PATH rcvfrom: 10.31.1.1 (so-1/0/0.0) 9 pkts
PATH sentto: 10.31.2.1 (so-6/0/0.0) 11 pkts
RESV rcvfrom: 10.31.2.1 (so-6/0/0.0) 10 pkts
Explct route: 10.31.2.1
Record route: 10.31.1.1 <self> 10.31.2.1
Total 1 displayed, Up 1, Down 0
user@Router3> show rsvp neighbor detail
RSVP neighbor: 2 learned
Address: 10.31.2.1 via: so-6/0/0.0 status: Up
Last changed time: 27, Idle: 0 sec, Up cnt: 1, Down cnt: 0
Message received: 19
Hello: sent 6, received: 6, interval: 9 sec
Remote instance: 0x625d2852, Local instance: 0x327317df
Refresh reduction: not operational
Link protection: enabled
LSP name: Bypass->10.31.2.1
Bypass LSP: operational, Backup routes: 1 , Backup LSPs: 0
O número de rotas de backup é de 1.
Bypass explicit route: 10.31.1.1 10.31.3.2
Address: 10.31.1.1 via: so-1/0/0.0 status: Up
Last changed time: 41, Idle: 0 sec, Up cnt: 1, Down cnt: 0
Message received: 15
Hello: sent 17, received: 17, interval: 3 sec
Remote instance: 0x2ebdcf43, Local instance: 0x643d9e23
Refresh reduction: not operational
Link protection: disabled
Bypass LSP: does not exist, Backup routes: 0, Backup LSPs: 0
user@Router3> show rsvp interface detail
RSVP interface: 2 active
fxp0.0 Index 1, State Dis/Up
NoAuthentication, NoAggregate, NoReliable, NoLinkProtection
HelloInterval 9(second)
Address 192.168.6.64
PacketType Total Last 5 seconds
Sent Received Sent Received
Path 0 0 0 0
PathErr 0 0 0 0
PathTear 0 0 0 0
Resv 0 0 0 0
ResvErr 0 0 0 0
ResvTear 0 0 0 0
Hello 0 0 0 0
Ack 0 0 0 0
Srefresh 0 0 0 0
EndtoEnd RSVP 0 0 0 0
so-1/0/0.0 Index 6, State Ena/Up
NoAuthentication, NoAggregate, NoReliable, NoLinkProtection
HelloInterval 3(second)
Address 10.31.1.2, 10.245.271.53
ActiveResv 1, PreemptionCnt 0, Update threshold 10%
Subscription 100%, StaticBW 2.48832Gbps, AvailableBW 2.48832Gbps
PacketType Total Last 5 seconds
Sent Received Sent Received
Path 5 14 0 1
PathErr 0 0 0 0
PathTear 0 0 0 0
Resv 8 9 0 0
ResvErr 0 0 0 0
ResvTear 0 0 0 0
Hello 23 25 2 2
Ack 0 0 0 0
Srefresh 0 0 0 0
EndtoEnd RSVP 0 0 0 0
so-6/0/0.0 Index 9, State Ena/Up
NoAuthentication, NoAggregate, NoReliable, LinkProtection
A proteção de enlaces está ativada.
HelloInterval 9(second)
Address 10.31.2.2, 10.245.271.53
ActiveResv 1, PreemptionCnt 0, Update threshold 10%
Subscription 100%, StaticBW 9.95328Gbps, AvailableBW 9.95328Gbps
PacketType Total Last 5 seconds
Sent Received Sent Received
Path 12 8 0 0
PathErr 0 0 0 0
PathTear 0 1 0 0
Resv 9 14 0 1
ResvErr 0 0 0 0
ResvTear 0 0 0 0
Hello 8 8 1 1
Ack 0 0 0 0
Srefresh 0 0 0 0
EndtoEnd RSVP 0 0 0 0
user@Router3> show route forwarding-table family mpls
Routing table: ccc
MPLS:
Destination Type RtRef Next hop Type Index NhRef Netif
default perm 0 dscd 1 1
0 user 0 recv 3 3
1 user 0 recv 3 3
2 user 0 recv 3 3
100000 user 0 ulst 77 1
Este é o LSP principal.
Swap 0 so-6/0/0.0
Swap 100004[0] so-1/0/0.0
100000(S=0) user 0 ulst 78 1
Pop so-6/0/0.0
Swap 100004[0] so-1/0/0.0
100007 user 0 ulst 71 1
Este é o LSP de bypass do Roteador 1 ao Roteador 2.
Swap 0 so-6/0/0.0
Swap 100003[0] so-1/0/0.0
100007(S=0) user 0 ulst 73 1
Pop so-6/0/0.0
Swap 100003[0] so-1/0/0.0
Caso 2: quando o link do roteador 1 para o roteador 3 estiver desativado
[edit] user@Router1# set interfaces so-7/3/2 disable [edit] user@Router1# commit commit complete
A interface primária do Roteador 1 ao Roteador 3 está desativada.
Roteador 1
user@Router1> show mpls lsp Ingress LSP: 1 sessions To From State Rt ActivePath P LSPname 10.245.71.52 10.245.71.51 Up 0 path1 * Protected_LSP
O LSP principal está em alta.
Total 1 displayed, Up 1, Down 0 Egress LSP: 0 sessions Total 0 displayed, Up 0, Down 0 Transit LSP: 1 sessions To From State Rt Style Labelin Labelout LSPname 10.245.71.52 10.245.271.53 Up 0 1 SE 100004 0 Bypass->10.31.2.1
Este é o LSP de bypass do Roteador 3 ao Roteador 2.
Total 1 displayed, Up 1, Down 0 user@Router1> show rsvp session detail Ingress RSVP: 3 sessions 10.245.71.52 From: 10.31.3.1, LSPstate: Up, ActiveRoute: 0 LSPname: Protected_LSP
Este é o LSP de backup recém-sinalizado, conforme indicado pelo campo De/A.
Resv style: 1 SE, Label in: -, Label out: 100000 Time left: -, Since: Thu Aug 8 12:29:16 2002 Tspec: rate 0bps size 0bps peak Infbps m 20 M 1500 Port number: sender 2 receiver 33 protocol 0 Link protection desired Type: Backup LSP at Point-of-Local-Repair PATH rcvfrom: localclient PATH sentto: 10.31.1.2 (so-0/0/0.0) 4 pkts RESV rcvfrom: 10.31.2.2 (so-0/0/0.0) 3 pkts Explct route: 10.31.2.2 10.31.2.1 Record route: <self> 10.31.2.2 10.31.2.1 10.245.71.52 From: 10.245.71.51, LSPstate: Dn, ActiveRoute: 0
O LSP original está desativado.
LSPname: Protected_LSP Resv style: 0 -, Label in: -, Label out: - Time left: -, Since: Thu Aug 8 12:13:24 2002 Tspec: rate 0bps size 0bps peak Infbps m 20 M 1500 Port number: sender 2 receiver 33 protocol 0 Link protection desired Type: Link protected LSP PATH rcvfrom: localclient PATH sentto: [no route] Explct route: 10.31.1.2 10.31.2.1 Record route: <self> ...incomplete 10.245.271.53 From: 10.245.71.51, LSPstate: Up, ActiveRoute: 1 LSPname: Bypass->10.31.1.2
Este é o LSP de bypass do Roteador 1 ao Roteador 2.
Resv style: 1 SE, Label in: -, Label out: 100001 Time left: -, Since: Thu Aug 8 12:26:48 2002 Tspec: rate 0bps size 0bps peak Infbps m 20 M 1500 Port number: sender 1 receiver 52 protocol 0 Type: Bypass LSP PATH rcvfrom: localclient PATH sentto: 10.31.3.2 (so-0/0/0.0) 13 pkts RESV rcvfrom: 10.31.3.2 (so-0/0/0.0) 13 pkts Explct route: 10.31.3.2 10.31.2.2 Record route: <self> 10.31.3.2 10.31.2.2 Total 3 displayed, Up 2, Down 1 Egress RSVP: 0 sessions Total 0 displayed, Up 0, Down 0 Transit RSVP: 1 sessions 10.245.71.52 From: 10.245.271.53, LSPstate: Up, ActiveRoute: 0 LSPname: Bypass->10.31.2.1
Este é o bypass LSP do Roteador 3 para o Roteador 2, que falhará no próximo caso.
Resv style: 1 SE, Label in: 100004, Label out: 0 Time left: 38, Since: Thu Aug 8 12:27:07 2002 Tspec: rate 0bps size 0bps peak Infbps m 20 M 1500 Port number: sender 1 receiver 16 protocol 0 PATH rcvfrom: 10.31.1.2 (so-7/3/2.0) 11 pkts PATH sentto: 10.31.3.2 (so-0/0/0.0) 12 pkts RESV rcvfrom: 10.31.3.2 (so-0/0/0.0) 12 pkts Explct route: 10.31.3.2 Record route: 10.31.1.2 <self> 10.31.3.2 Total 1 displayed, Up 1, Down 0 user@Router1> show rsvp neighbor detail RSVP neighbor: 2 learned Address: 10.31.1.2 via: so-7/3/2.0 status: Down
O vizinho caiu.
Last changed time: 25, Idle: 25 sec, Up cnt: 2, Down cnt: 2
Message received: 397
Hello: sent 900, received: 890, interval: 3 sec
Remote instance: 0x0, Local instance: 0x41b41b17
Refresh reduction: not operational
Link protection: enabled
LSP name: Bypass->10.31.1.2
Bypass LSP: operational, Backup routes: 2, Backup LSPs: 1
Bypass explicit route: 10.31.3.2 10.31.2.2
Address: 10.31.3.2 via: so-0/0/0.0 status: Up
Last changed time: 25:40, Idle: 5 sec, Up cnt: 4, Down cnt: 3
Message received: 502
Hello: sent 558, received: 538, interval: 20 sec
Remote instance: 0x194fa7af, Local instance: 0x507b7c2a
Refresh reduction: not operational
Link protection: disabled
Bypass LSP: does not exist, Backup routes: 0, Backup LSPs: 0
user@Router1> show route 10.31.5.1
inet.0: 23 destinations, 23 routes (22 active, 0 holddown, 1 hidden)
+ = Active Route, - = Last Active, * = Both
10.31.5.1/32 *[RSVP/7] 00:03:04, metric 20
> via so-0/0/0.0, label-switched-path Bypass->10.31.1.2
A rota pode ser alcançada por meio do LSP de backup.
user@Router1> show route forwarding-table destination 10.31.5.1 Routing table: inet Internet: Destination Type RtRef Next hop Type Index NhRef Netif 10.31.5.1/32 user 0 Push 100000, Push 100001(top)[0] so-0/0/0.0
Rótulos de pilha dupla aparecem no LSP de backup do Roteador 1 ao Roteador 2 para o Roteador 3.
Antes de prosseguir para o Caso 3, reencável a so-7/3/2 interface no Roteador 1.
[edit] user@Router1# delete interfaces so-7/3/2 disable [edit] user@Router1# commit commit complete
Caso 3: quando o link do roteador 3 para o roteador 2 for desativado
[edit] user@Router3# set interfaces so-6/0/0 disable [edit] user@Router3# commit commit complete
A interface primária do Roteador 3 ao Roteador 2 é desativada.
Roteador 3
user@Router3> show rsvp session Ingress RSVP: 2 sessions To From State Rt Style Labelin Labelout LSPname 10.245.71.52 10.245.271.53 Up 1 1 SE - 100005 Bypass->10.31.2.1 10.245.71.52 10.31.1.2 Up 0 1 SE - 0 Protected_LSP
O backup é sinalizado do Roteador 3 ao Roteador 2.
Total 2 displayed, Up 2, Down 0 Egress RSVP: 1 sessions To From State Rt Style Labelin Labelout LSPname 10.245.271.53 10.245.71.51 Up 0 1 SE 3 - Bypass->10.31.1.2 Total 1 displayed, Up 1, Down 0 Transit RSVP: 1 sessions To From State Rt Style Labelin Labelout LSPname 10.245.71.52 10.245.71.51 Dn 0 0 - 100000 - Protected_LSP
O LSP principal está desativado.
Total 1 displayed, Up 0, Down 1 user@Router3> show rsvp session detail Ingress RSVP: 2 sessions 10.245.71.52 From: 10.245.271.53, LSPstate: Up, ActiveRoute: 1 LSPname: Bypass->10.31.2.1 Suggested label received: -, Suggested label sent: - Recovery label received: -, Recovery label sent: 100005 Resv style: 1 SE, Label in: -, Label out: 100005 Time left: -, Since: Thu Aug 8 12:31:09 2002 Tspec: rate 0bps size 0bps peak Infbps m 20 M 1500 Port number: sender 1 receiver 17 protocol 0 Type: Bypass LSP PATH rcvfrom: localclient PATH sentto: 10.31.1.1 (so-1/0/0.0) 6 pkts RESV rcvfrom: 10.31.1.1 (so-1/0/0.0) 6 pkts Explct route: 10.31.1.1 10.31.3.2 Record route: <self> 10.31.1.1 10.31.3.2 10.245.71.52 From: 10.31.1.2, LSPstate: Up, ActiveRoute: 0 LSPname: Protected_LSP Suggested label received: -, Suggested label sent: - Recovery label received: -, Recovery label sent: 0 Resv style: 1 SE, Label in: -, Label out: 0 Time left: -, Since: Thu Aug 8 12:31:59 2002 Tspec: rate 0bps size 0bps peak Infbps m 20 M 1500 Port number: sender 2 receiver 33 protocol 0 Link protection desired Type: Backup LSP at Point-of-Local-Repair
Este é o LSP de backup.
PATH rcvfrom: localclient PATH sentto: 10.31.2.1 (so-1/0/0.0) 5 pkts RESV rcvfrom: 10.31.3.2 (so-1/0/0.0) 2 pkts Explct route: 10.31.3.2 Record route: <self> 10.31.3.2 Total 2 displayed, Up 2, Down 0 Egress RSVP: 1 sessions 10.245.271.53 From: 10.245.71.51, LSPstate: Up, ActiveRoute: 0 LSPname: Bypass->10.31.1.2 Suggested label received: -, Suggested label sent: - Recovery label received: -, Recovery label sent: - Resv style: 1 SE, Label in: 3, Label out: - Time left: 31, Since: Thu Aug 8 12:26:48 2002 Tspec: rate 0bps size 0bps peak Infbps m 20 M 1500 Port number: sender 1 receiver 52 protocol 0 PATH rcvfrom: 10.31.2.1 (so-6/0/0.0) 23 pkts PATH sentto: localclient RESV rcvfrom: localclient Record route: 10.31.3.1 10.31.2.1 <self> Total 1 displayed, Up 1, Down 0 Transit RSVP: 1 sessions 10.245.71.52 From: 10.245.71.51, LSPstate: Dn, ActiveRoute: 0 LSPname: Protected_LSP Suggested label received: -, Suggested label sent: - Recovery label received: -, Recovery label sent: - Resv style: 0 -, Label in: 100000, Label out: - Time left: 53, Since: Thu Aug 8 12:26:39 2002 Tspec: rate 0bps size 0bps peak Infbps m 20 M 1500 Port number: sender 2 receiver 33 protocol 0 Link protection desired Type: Link protected LSP PATH rcvfrom: 10.31.1.1 (so-1/0/0.0) 30 pkts PATH sentto: [no route] Explct route: 10.31.2.1 Record route: 10.31.1.1 <self> ...incomplete Total 1 displayed, Up 0, Down 1 user@Router3> show route forwarding-table family mpls Routing table: ccc MPLS: Destination Type RtRef Next hop Type Index NhRef Netif default perm 0 dscd 1 1 0 user 0 recv 3 3 1 user 0 recv 3 3 2 user 0 recv 3 3 100000 user 0 Swap 100005[0] so-1/0/0.0
Isso mostra a troca de rótulos pelo LSP principal viajando pelo LSP de backup pelo Roteador 2.
Roteador 1
user@Router1> show rsvp session detail Ingress RSVP: 1 sessions 10.245.71.52 From: 10.245.71.51, LSPstate: Up, ActiveRoute: 1 LSPname: Protected_LSP
O LSP principal não é afetado.
Resv style: 1 SE, Label in: -, Label out: 100000 Time left: -, Since: Thu Aug 8 12:13:24 2002 Tspec: rate 0bps size 0bps peak Infbps m 20 M 1500 Port number: sender 2 receiver 33 protocol 0 Link protection desired PATH rcvfrom: localclient PATH sentto: 10.31.1.2 (so-7/3/2.0) 95 pkts RESV rcvfrom: 10.31.1.2 (so-7/3/2.0) 87 pkts Explct route: 10.31.1.2 10.31.2.1 Record route: <self> 10.31.1.2 10.31.3.2 Total 1 displayed, Up 1, Down 0 Egress RSVP: 0 sessions Total 0 displayed, Up 0, Down 0 Transit RSVP: 1 sessions 10.245.71.52 From: 10.245.271.53, LSPstate: Up, ActiveRoute: 0 LSPname: Bypass->10.31.2.1
O LSP de bypass está listado, porque o Roteador 1 não detecta o backup do Roteador 3 ao Roteador 2.
Resv style: 1 SE, Label in: 100005, Label out: 0 Time left: 53, Since: Thu Aug 8 12:31:09 2002 Tspec: rate 0bps size 0bps peak Infbps m 20 M 1500 Port number: sender 1 receiver 17 protocol 0 PATH rcvfrom: 10.31.1.2 (so-7/3/2.0) 11 pkts PATH sentto: 10.31.3.2 (so-0/0/0.0) 11 pkts RESV rcvfrom: 10.31.3.2 (so-0/0/0.0) 11 pkts Explct route: 10.31.3.2 Record route: 10.31.1.2 <self> 10.31.3.2 Total 1 displayed, Up 1, Down 0 user@Router1> show route forwarding-table family mpls Routing table: ccc MPLS: Destination Type RtRef Next hop Type Index NhRef Netif default perm 0 dscd 8 1 0 user 0 recv 10 3 1 user 0 recv 10 3 2 user 0 recv 10 3 100005 user 0 Swap 0 so-0/0/0.0
Os rótulos são trocados no LSP de bypass.
100005(S=0) user 0 Pop so-0/0/0.0 user@Router1> show route forwarding-table destination 10.31.5.1 extensive Routing table: inet [Index 0] Internet: Destination: 10.31.5.1/32 Route type: user Route reference: 0 Flags: sent to PFE Next-hop type: Push 100000
Há apenas uma entrada aqui. O desvio para o Roteador 3 está quebrado porque a conexão entre o Roteador 3 e o Roteador 2 está desativada.
Next-hop interface: so-7/3/2.0
user@Router1> show isis adjacency
Interface System L State Hold (secs) SNPA
so-0/0/0.0 Router2 2 Up 24
so-7/3/2.0 Router3 2 Up 23
user@Router1> show route 10.31.5.1 extensive
inet.0: 22 destinations, 22 routes (21 active, 0 holddown, 1 hidden)
10.31.5.1/32 (1 entry, 1 announced)
State: <FlashAll>
TSI:
KRT in-kernel 10.31.5.1/32 -> {0.0.0.0}
*RSVP Preference: 7
Next hop: via so-7/3/2.0 weight 1, selected
Apenas uma entrada é mostrada.
Label-switched-path Protected_LSP
Label operation: Push 100000
State: <Active Int>
Local AS: 69
Age: 2:21 Metric: 100
Task: RSVP
Announcement bits (1): 0-KRT
AS path: I
user@Router1> show rsvp neighbor detail
RSVP neighbor: 2 learned
Address: 10.31.1.2 via: so-7/3/2.0 status: Up
Last changed time: 2:58, Idle: 0 sec, Up cnt: 3, Down cnt: 2
Message received: 433
Hello: sent 965, received: 950, interval: 3 sec
Remote instance: 0x74be7c42, Local instance: 0x41b41b17
Refresh reduction: not operational
Link protection: disabled
Bypass LSP: does not exist, Backup routes: 0, Backup LSPs: 0
Address: 10.31.3.2 via: so-0/0/0.0 status: Up
Last changed time: 30:54, Idle: 0 sec, Up cnt: 4, Down cnt: 3
Message received: 533
Hello: sent 593, received: 573, interval: 20 sec
Remote instance: 0x194fa7af, Local instance: 0x507b7c2a
Refresh reduction: not operational
Link protection: disabled
Bypass LSP: does not exist, Backup routes: 0, Backup LSPs: 0
user@Router1> show rsvp session
Ingress RSVP: 1 sessions
To From State Rt Style Labelin Labelout LSPname
10.245.71.52 10.245.71.51 Up 1 1 SE - 100000 Protected_LSP
Total 1 displayed, Up 1, Down 0
Egress RSVP: 0 sessions
Total 0 displayed, Up 0, Down 0
Transit RSVP: 1 sessions
To From State Rt Style Labelin Labelout LSPname
10.245.71.52 10.245.271.53 Up 0 1 SE 100005 0
Bypass->10.31.2.1
Total 1 displayed, Up 1, Down 0