46
# On Switch D, create IP prefix list peer-a to permit 1.1.1.9/32. Switch D uses this list to filter
peers.
[SwitchD] ip prefix-list peer-a index 10 permit 1.1.1.9 32
# On Switch D, create IP prefix list prefix-to-c to deny subnet 11.1.1.0/24. Switch D uses this
list to filter FEC-label mappings to be advertised to Switch C.
[SwitchD] ip prefix-list prefix-to-c index 10 deny 11.1.1.0 24
[SwitchD] ip prefix-list prefix-to-c index 20 permit 0.0.0.0 0 less-equal 32
# On Switch D, create IP prefix list peer-c to permit subnet 3.3.3.9/32. Switch D uses this list to
filter peers.
[SwitchD] ip prefix-list peer-c index 10 permit 3.3.3.9 32
# On Switch D, configure a label advertisement policy, so Switch D does not advertise label
mappings for FEC 21.1.1.0/24 to Switch A, and does not advertise label mappings for FEC
11.1.1.0/24 to Switch C.
[SwitchD] mpls ldp
[SwitchD-ldp] advertise-label prefix-list prefix-to-a peer peer-a
[SwitchD-ldp] advertise-label prefix-list prefix-to-c peer peer-c
[SwitchD-ldp] quit
Verifying the configuration
# Display LDP LSP information on each switch.
[SwitchA] display mpls ldp lsp
Status Flags: * - stale, L - liberal, B - backup
Statistics:
FECs: 2 Ingress LSPs: 1 Transit LSPs: 1 Egress LSPs: 1
FEC In/Out Label Nexthop OutInterface
11.1.1.0/24 1277/-
-/1151(L)
-/1277(L)
21.1.1.0/24 -/1276 10.1.1.2 Vlan-int2
1276/1276 10.1.1.2 Vlan-int2
[SwitchB] display mpls ldp lsp
Status Flags: * - stale, L - liberal, B - backup
Statistics:
FECs: 2 Ingress LSPs: 2 Transit LSPs: 2 Egress LSPs: 0
FEC In/Out Label Nexthop OutInterface
11.1.1.0/24 -/1277 10.1.1.1 Vlan-int2
1277/1277 10.1.1.1 Vlan-int2
21.1.1.0/24 -/1149 20.1.1.2 Vlan-int3
1276/1149 20.1.1.2 Vlan-int3
[SwitchC] display mpls ldp lsp
Status Flags: * - stale, L - liberal, B - backup
Statistics:
FECs: 2 Ingress LSPs: 1 Transit LSPs: 1 Egress LSPs: 1
FEC In/Out Label Nexthop OutInterface
11.1.1.0/24 -/1277 20.1.1.1 Vlan-int3
1148/1277 20.1.1.1 Vlan-int3
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