Task 2-1: Enable LDP on PE and P Routers

  1. Enable CEF on both PE and P Routers
  2. Enable LDP on the subinterfaces of the P and PE routers

Commands:

router (config)# ip cef [distriputed] - Enables CEF globally on the router
router (config-if)# mpls label protocol ldp - Select the label protocol to be used
router (config-if)# mpls ip - Enables MPLS on the interface

router# show ip cef detail
router# show mpls interface - Show MPLS enables interfaces
router# show mpls ldp discovery
router# show mpls ldp neighbor
router# show mpls ldp bindings - example

Task 2-2: Experiment with TTL Propagation

  1. Enable MPLS TTL propagation on all P and PE routers
  2. Verify that MPLS TTL propagation is working
  3. Disable MPLS TTL propagation

Commands:

router (config)# no mpls ip propagate-ttl forward

Task 2-3: Configure Conditional Label Distribution

  1. Enable conditional label distribution on the P and PE routers to allow only distribution of lables related to the core loopback addresses and the interfaces that provide direct customer support

Commands:

router (config)# mpls ldp advertise labels for 90 to 91
router (config)# access-list 90 permit 192.168.254.0 0.0.0.255
router (config)# access-list 91 permit any

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