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Configuration Guide - MPLS

S7700 and S9700 V200R010C00

This document describes MPLS configurations supported by the switch, including the principle and configuration procedures of static LSPs, MPLS LDP, MPLS TE, MPLS QoS, MPLS OAM, Seamless MPLS, and MPLS common features, and provides configuration examples.
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Creating a Backup CR-LSP

Creating a Backup CR-LSP

Context

CR-LSP backup can be configured to allow traffic to switch from a primary CR-LSP to a backup CR-LSP, providing end-to-end protection.

Perform the following configurations on the ingress node of an MPLS TE tunnel.

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.

    NOTE:

    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.

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Updated: 2019-04-18

Document ID: EDOC1000141902

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