H3C Technologies H3C S10500 Series Switches - Manual (Page 95)

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Configuring BFD for LSPs
Network requirements
As 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 from
21.1.1.0/24 to 11.1.1.0/24. Configure BFD for the LSPs to detect LSP failures.
Configuration procedure
1. Configure LDP sessions.
For more configuration information, 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] quit
3. Verify the configurations.
Execute the display mpls lsp bfd command on Switch A and Switch C respectively to view information
about the sessions established for the LSPs. Take Switch A as an example:
[SwitchA] display mpls lsp bfd
MPLS BFD Session(s) Information
-----------------------------------------------------------------------------
FEC : 11.1.1.0/24 Type : LSP
Local Discr : 130 Remote Discr : 130
Tunnel ID : --- NextHop : ---
Session State : Up Source IP : 3.3.3.9
Session Role : Passive
FEC : 21.1.1.0/24 Type : LSP
Local Discr : 129 Remote Discr : 129
Tunnel ID : 0x6040000 NextHop : 10.1.1.2
Session State : Up Source IP : 1.1.1.9
Session Role : Active
Total Session Num: 2
The output indicates that two BFD sessions have been established between Switch A and Switch C, one
for detecting the connectivity of the LSP Switch A-Switch B-Switch C, and the other for detecting the
connectivity of the LSP Switch C-Switch B-Switch A.
You can use the following command to view the verbose information of the BFD sessions.
[SwitchA] display bfd session verbose