40
[SwitchB] ip prefix-list switchb index 40 permit 11.1.1.0 24
[SwitchB] ip prefix-list switchb index 50 permit 21.1.1.0 24
[SwitchB] mpls ldp
[SwitchB-ldp] lsp-trigger prefix-list switchb
[SwitchB-ldp] quit
# On Switch C, create IP prefix list switchc, and configure LDP to use only the routes permitted
by the prefix list to establish LSPs.
[SwitchC] ip prefix-list switchc index 10 permit 1.1.1.9 32
[SwitchC] ip prefix-list switchc index 20 permit 2.2.2.9 32
[SwitchC] ip prefix-list switchc index 30 permit 3.3.3.9 32
[SwitchC] ip prefix-list switchc index 40 permit 11.1.1.0 24
[SwitchC] ip prefix-list switchc index 50 permit 21.1.1.0 24
[SwitchC] mpls ldp
[SwitchC-ldp] lsp-trigger prefix-list switchc
[SwitchC-ldp] quit
346BVerifying the configuration
# Display LDP LSP information on the switches, for example, on Switch A.
[SwitchA] display mpls ldp lsp
Status Flags: * - stale, L - liberal, B - backup
FECs: 5 Ingress: 3 Transit: 3 Egress: 2
FEC In/Out Label Nexthop OutInterface
1.1.1.9/32 3/-
-/1279(L)
2.2.2.9/32 -/3 10.1.1.2 Vlan-int2
1279/3 10.1.1.2 Vlan-int2
3.3.3.9/32 -/1278 10.1.1.2 Vlan-int2
1278/1278 10.1.1.2 Vlan-int2
11.1.1.0/24 1277/-
-/1277(L)
21.1.1.0/24 -/1276 10.1.1.2 Vlan-int2
1276/1276 10.1.1.2 Vlan-int2
# Test the connectivity of the LDP LSP from Switch A to Switch C.
[SwitchA] 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 Switch C to Switch A.
[SwitchC] ping mpls -a 21.1.1.1 ipv4 11.1.1.0 24
MPLS Ping FEC: 11.1.1.0/24 : 100 data bytes
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