Creating a Backup CR-LSP

Procedure

1. Run system-view

   The system view is displayed.

2. Run interface tunnel tunnel-number

   The tunnel interface view is displayed.

3. Run mpls te backup hot-standby

   or run mpls te backup ordinary

   The mode of establishing a backup CR-LSP is configured.

   If hot-standby is specified, a hot-standby CR-LSP is set up. To implement fast switching at the millisecond level, perform the operation of Configuring Static BFD for CR-LSPs or Configuring Dynamic BFD for CR-LSPs.

   

   A tunnel interface cannot be used for both a bypass tunnel and a backup tunnel. A protection failure will occur if the mpls te backup and mpls te bypass-tunnel commands are run on the tunnel interface, or if the mpls te backup and mpls te protected-interface commands are run on the tunnel interface. For details on how to create a bypass CR-LSP, see Configuring Manual TE FRR or Configuring Auto TE FRR.

   A tunnel interface cannot be used for both a bypass tunnel and a protection tunnel in a tunnel protection group. A protection failure will occur if the mpls te backup and mpls te protection tunnel commands are run on the tunnel interface. For details on how to create a protection tunnel, see Configuring a Tunnel Protection Group.

   After hot standby or ordinary backup is configured, the system selects a path for a backup CR-LSP. To specify a path for a backup CR-LSP, repeatedly perform one or more of steps 4 to 6. When hot standby is configured, repeatedly perform one or more of steps 7 to 9.

4. (Optional) Run mpls te path explicit-path path-name secondary

   An explicit path is specified for the backup CR-LSP.

   Use a separate explicit path for the backup CR-LSP to prevent the backup CR-LSP from completely overlapping its primary CR-LSP. Protection will fail if the backup CR-LSP completely overlaps its primary CR-LSP.

   The mpls te path explicit-path command can be run successfully only after an explicit path is set up by running the explicit-path path-name command in the system view, and the nodes on the path are specified.

5. (Optional) Run mpls te affinity property properties [ mask mask-value ] secondary

   The affinity property is configured for the backup CR-LSP.

   By default, the affinity property used by the backup CR-LSP is 0x0 and the mask is 0x0.

6. (Optional) Run mpls te hop-limit hop-limit-value secondary

   The hop limit is set for the backup CR-LSP.

   The default hop limit is 32.

7. (Optional) Run mpls te backup hot-standby overlap-path

   The path overlapping function is configured. This function allows a hot-standby CR-LSP to use links of a primary CR-LSP.

   By default, the path overlapping function is disabled. If the path overlapping function is disabled, a hot-standby CR-LSP may fail to be set up.

   After the path overlapping function is configured, the path of the hot-standby CR-LSP partially overlaps the path of the primary CR-LSP when the hot-standby CR-LSP cannot exclude paths of the primary CR-LSP.

8. (Optional) Run mpls te backup hot-standby wtr interval

   The WTR time for a switchback is set.

   By default, the WTR time for switching traffic from a hot-standby CR-LSP to a primary CR-LSP is 10 seconds.

9. (Optional) Run mpls te backup hot-standby mode { revertive [ wtr interval ] | non-revertive }

   A revertive mode is specified.

   By default, the revertive mode is used.

10. Run mpls te commit

    The configuration is committed.