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# Configure Switch B.
<SwitchB> system-view
[SwitchB] mpls lsr-id 2.2.2.9
[SwitchB] mpls ldp
[SwitchB-ldp] quit
[SwitchB] interface vlan-interface 2
[SwitchB-Vlan-interface2] mpls enable
[SwitchB-Vlan-interface2] mpls ldp enable
[SwitchB-Vlan-interface2] quit
[SwitchB] interface vlan-interface 3
[SwitchB-Vlan-interface3] mpls enable
[SwitchB-Vlan-interface3] mpls ldp enable
[SwitchB-Vlan-interface3] quit
# Configure Switch C.
<SwitchC> system-view
[SwitchC] mpls lsr-id 3.3.3.9
[SwitchC] mpls ldp
[SwitchC-ldp] quit
[SwitchC] interface vlan-interface 3
[SwitchC-Vlan-interface3] mpls enable
[SwitchC-Vlan-interface3] mpls ldp enable
[SwitchC-Vlan-interface3] quit
[SwitchC] interface vlan-interface 7
[SwitchC-Vlan-interface7] mpls enable
[SwitchC-Vlan-interface7] mpls ldp enable
[SwitchC-Vlan-interface7] quit
# Configure Switch D.
<SwitchD> system-view
[SwitchD] mpls lsr-id 4.4.4.9
[SwitchD] mpls ldp
[SwitchD-ldp] quit
[SwitchD] interface vlan-interface 6
[SwitchD-Vlan-interface6] mpls enable
[SwitchD-Vlan-interface6] mpls ldp enable
[SwitchD-Vlan-interface6] quit
[SwitchD] interface vlan-interface 7
[SwitchD-Vlan-interface7] mpls enable
[SwitchD-Vlan-interface7] mpls ldp enable
[SwitchD-Vlan-interface7] quit
4. Configure LSP generation policies:
# On Switch A, create IP prefix list switcha, and configure LDP to use only the routes permitted
by the prefix list to establish LSPs.
[SwitchA] ip prefix-list switcha index 10 permit 11.1.1.0 24
[SwitchA] ip prefix-list switcha index 20 permit 21.1.1.0 24
[SwitchA] mpls ldp
[SwitchA-ldp] lsp-trigger prefix-list switcha
[SwitchA-ldp] quit
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