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[RouterD] display mpls ldp lsp
Status Flags: * - stale, L - liberal, B - backup
FECs: 2
FEC
11.1.1.0/24
21.1.1.0/24
The output shows that Router A and Router C have received FEC-label mappings only from Router B.
Router B has received FEC-label mappings from both Router A and Router C. Router D does not
receive FEC-label mappings from Router A or Router C. LDP has established an LSP only over the
link Router A—Router B—Router C.
# Test the connectivity of the LDP LSP from Router A to Router C.
[RouterA] ping mpls -a 11.1.1.1 ipv4 21.1.1.0 24
MPLS Ping FEC: 21.1.1.0/24 : 100 data bytes
100 bytes from 20.1.1.2: Sequence=1 time=1 ms
100 bytes from 20.1.1.2: Sequence=2 time=1 ms
100 bytes from 20.1.1.2: Sequence=3 time=8 ms
100 bytes from 20.1.1.2: Sequence=4 time=2 ms
100 bytes from 20.1.1.2: Sequence=5 time=1 ms
--- FEC: 21.1.1.0/24 ping statistics ---
5 packets transmitted, 5 packets received, 0.0% packet loss
round-trip min/avg/max = 1/2/8 ms
# Test the connectivity of the LDP LSP from Router C to Router A.
[RouterC] ping mpls -a 21.1.1.1 ipv4 11.1.1.0 24
MPLS Ping FEC: 11.1.1.0/24 : 100 data bytes
100 bytes from 10.1.1.1: Sequence=1 time=1 ms
100 bytes from 10.1.1.1: Sequence=2 time=1 ms
100 bytes from 10.1.1.1: Sequence=3 time=1 ms
100 bytes from 10.1.1.1: Sequence=4 time=1 ms
100 bytes from 10.1.1.1: Sequence=5 time=1 ms
--- FEC: 11.1.1.0/24 ping statistics ---
5 packets transmitted, 5 packets received, 0.0% packet loss
round-trip min/avg/max = 1/1/1 ms
LDP FRR configuration example
Network requirements
Router S, Router A, and Router D reside in the same OSPF domain. Configure OSPF FRR so LDP
can establish a primary LSP and a backup LSP on the Router S—Router D and the Router
S—Router A—Router D links, respectively.
When the primary LSP operates correctly, traffic between subnets 11.1.1.0/24 and 21.1.1.0/24 is
forwarded through the LSP.
When the primary LSP fails, traffic between the two subnets can be immediately switched to the
backup LSP.
Ingress: 0
In/Out Label
1151/-
-/1277(L)
1150/-
52
Transit: 0
Egress: 2
Nexthop
OutInterface
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