Secondary standby LSP is down due to the error, 'CSPF: Can't find non-overlapping path'.
Primary and secondary standby LSP are using the same exit interface.
When the primary and secondary standby LSP are using the same exit interface, secondary standby LSP remains down. It gives a computation error for the secondary standby LSP.
user@router# show protocols mpls
label-switched-path R1-R5 {
from 1.1.1.1;
to 5.5.5.5;
inter-domain;
primary R3;
secondary test {
standby;
}
}
path R3 {
3.3.3.3;
}
path test {
3.3.3.3;
}
interface ge-0/0/1.0;
interface ge-0/0/2.0;
[edit]
user@router# run show mpls lsp extensive
Ingress LSP: 1 sessions
5.5.5.5
From: 1.1.1.1, State: Up, ActiveRoute: 0, LSPname: R1-R5
ActivePath: R3 (primary)
PathDomain: Inter-domain
LSPtype: Static Configured, Penultimate hop popping
LoadBalance: Random
Encoding type: Packet, Switching type: Packet, GPID: IPv4
*Primary R3 State: Up
Priorities: 7 0
SmartOptimizeTimer: 180
Computed ERO (S [L] denotes strict [loose] hops): (CSPF metric: 10)
13.13.0.2 S
Received RRO (ProtectionFlag 1=Available 2=InUse 4=B/W 8=Node 10=SoftPreempt 20=Node-ID):
13.13.0.2 35.35.0.2
17 Mar 30 04:18:47.318 Self-ping ended successfully
16 Mar 30 04:18:46.839 Record Route: 13.13.0.2 35.35.0.2
15 Mar 30 04:18:46.839 Up
14 Mar 30 04:18:46.839 Self-ping started
13 Mar 30 04:18:46.839 Self-ping enqueued
12 Mar 30 04:18:46.511 Originate Call
11 Mar 30 04:18:46.511 CSPF: computation result accepted 13.13.0.2
10 Mar 30 04:18:46.508 Clear Call
9 Mar 30 00:36:14.072 Self-ping ended successfully
8 Mar 30 00:36:13.638 Selected as active path
7 Mar 30 00:36:13.623 Record Route: 13.13.0.2 35.35.0.2
6 Mar 30 00:36:13.623 Up
5 Mar 30 00:36:13.622 Self-ping started
4 Mar 30 00:36:13.622 Self-ping enqueued
3 Mar 30 00:36:13.280 Originate Call
2 Mar 30 00:36:13.280 CSPF: computation result accepted 13.13.0.2
1 Mar 30 00:33:15.156 CSPF failed: no route toward 5.5.5.5[6 times]
Standby test State: Dn
Priorities: 7 0
SmartOptimizeTimer: 180
No computed ERO.
1 Mar 30 04:55:48.186 CSPF: Can't find non-overlapping path to 3.3.3.3[57 times]
Created: Mon Mar 30 00:29:50 2020
Total 1 displayed, Up 1, Down 0
Deactivating primary LSP:
[edit]
user@router# deactivate protocols mpls label-switched-path R1-R5 primary R3
[edit]
user@router# commit
commit complete
Once primary LSP is deactivated, secondary LSP is UP.
user@router# run show mpls lsp extensive
Ingress LSP: 1 sessions
5.5.5.5
From: 1.1.1.1, State: Up, ActiveRoute: 0, LSPname: R1-R5
ActivePath: test (secondary)
PathDomain: Inter-domain
LSPtype: Static Configured, Penultimate hop popping
LoadBalance: Random
Encoding type: Packet, Switching type: Packet, GPID: IPv4
*Standby test State: Up
Priorities: 7 0
SmartOptimizeTimer: 180
Computed ERO (S [L] denotes strict [loose] hops): (CSPF metric: 10)
13.13.0.2 S
Received RRO (ProtectionFlag 1=Available 2=InUse 4=B/W 8=Node 10=SoftPreempt 20=Node-ID):
13.13.0.2 35.35.0.2
9 Mar 30 04:57:36.516 Self-ping ended successfully
8 Mar 30 04:57:35.887 Selected as active path
7 Mar 30 04:57:35.871 Record Route: 13.13.0.2 35.35.0.2
6 Mar 30 04:57:35.871 Up
5 Mar 30 04:57:35.871 Self-ping started
4 Mar 30 04:57:35.871 Self-ping enqueued
3 Mar 30 04:57:35.691 Originate Call
2 Mar 30 04:57:35.691 CSPF: computation result accepted 13.13.0.2
1 Mar 30 04:57:14.800 CSPF: Can't find non-overlapping path to 3.3.3.3[60 times]
Created: Mon Mar 30 00:29:50 2020
Once the exit interface of Primary and Secondary LSP is different, Secondary standby is UP again.