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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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Configuring SRLG

Configuring SRLG

Context

In the networking scenario where the hot standby CR-LSP is set up or TE FRR is enabled, configure the SRLG attribute on the outbound interface of the ingress node of the MPLS TE tunnel or the PLR and the other member links of the SRLG to which the outbound interface belongs.

Configuring SRLG includes:

Perform the following configurations according to actual networking.

Procedure

  • Configuring SRLG for the link

    Perform the following configurations on the links which are in the same SRLG.

    1. Run:

      system-view

      The system view is displayed.

    2. Run:

      interface interface-type interface-number

      The interface view is displayed.

    3. (Optional) On an Ethernet interface, run undo portswitch

      The interface is switched to Layer 3 mode.

      By default, an Ethernet interface works in Layer 2 mode.

    4. Run:

      mpls te srlg srlg-number

      The interface is configured as an SRLG member.

      On a network with CR-LSP hot standby or TE FRR configured, the SRLG attribute can be configured for the outbound interface of the ingress node of the MPLS TE tunnel or the PLR and other members of the SRLG to which the outbound interface belongs. A link joins an SRLG after the SRLG attribute is configured on an outbound interface of the link.

  • Configuring SRLG path calculation mode for the tunnel

    Perform the following configurations on the ingress node of the hot-standby tunnel or the TE FRR tunnel.

    1. Run:

      system-view

      The system view is displayed.

    2. Run:

      mpls

      The MPLS view is displayed.

    3. Run:

      mpls te srlg path-calculation [ strict | preferred ]

      The SRLG path calculation mode is configured.

      If you specify the strict keyword, CSPF avoids the following links when calculating the bypass CR-LSP or backup CR-LSP:
      • Link with the same SRLG attributes as SRLG attributes of the primary CR-LSP
      • All links along the primary CR-LSP regardless of whether the links are configured with SRLG attributes
      CSPF does not exclude the nodes that the primary CR-LSP passes.
      NOTE:
      • If you specify the strict keyword, CSPF always considers the SRLG as a constraint when calculating the path for the bypass CR-LSP or the backup CR-LSP.

      • If you specify the preferred keyword, CSPF tries to calculate the path which avoids the links in the same SRLG as protected interfaces; if the calculation fails, CSPF does not consider the SRLG as a constraint.

  • Delete the member interfaces of all SRLGs.

    Perform the following configurations to delete member interfaces of all SRLGs from a node of the MPLS TE tunnel.

    1. Run:

      system-view

      The system view is displayed.

    2. Run:

      mpls

      The MPLS view is displayed.

    3. Run:

      undo mpls te srlg all-config

      The member interfaces of all SRLGs are deleted from the MPLS TE node.

      NOTE:

      The undo mpls te srlg all-config does not delete an SRLG-based path calculation mode configured in the mpls te srlg path-calculation command in the MPLS view.

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Updated: 2019-04-18

Document ID: EDOC1000141902

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