895 packet(s) transmitted5 packet(s) received0.00% packet lossround-trip min/avg/max = 1/2/3 ms# On Switch C, test the connectivity of the LDP LSP from Switch C to Switch A.[SwitchC] ping lsp ipv4 11.1.1.0 24LSP Ping FEC: IPV4 PREFIX 11.1.1.0/24 : 100 data bytes, press CTRL_C to breakReply from 10.1.1.1: bytes=100 Sequence=1 time = 2 msReply from 10.1.1.1: bytes=100 Sequence=2 time = 2 msReply from 10.1.1.1: bytes=100 Sequence=3 time = 2 msReply from 10.1.1.1: bytes=100 Sequence=4 time = 3 msReply from 10.1.1.1: bytes=100 Sequence=5 time = 2 ms--- FEC: IPV4 PREFIX 11.1.1.0/24 ping statistics ---5 packet(s) transmitted5 packet(s) received0.00% packet lossround-trip min/avg/max = 2/2/3 msConfiguring BFD for LSPsNetwork requirementsAs shown in Figure 25, use LDP to establish an LSP from 11.1.1.0/24 to 21.1.1.0/24 and an LSP from21.1.1.0/24 to 11.1.1.0/24. Configure BFD for the LSPs to detect LSP failures.Configuration procedure1. Configure LDP sessions (see "Configuring LDP to establish LSPs dynamically").2. Enable BFD for LSPs:# Configure Switch A. system-view[SwitchA] mpls lspv[SwitchA -mpls-lspv] bfd enable 21.1.1.0 24[SwitchA -mpls-lspv] quit# Configure Switch C. system-view[SwitchC] mpls lspv[SwitchC-mpls-lspv] bfd enable 11.1.1.0 24[SwitchC-mpls-lspv] quit3. Verify the configuration:Execute the display mpls lsp bfd command on Switch A and Switch C respectively to viewinformation about the sessions established for the LSPs. Take Switch A as an example:[SwitchA] display mpls lsp bfdMPLS BFD Session(s) Information-----------------------------------------------------------------------------FEC : 11.1.1.0/24 Type : LSPLocal Discr : 130 Remote Discr : 130
