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Configuration Guide - MPLS

S7700 and S9700 V200R011C10

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 RSVP-TE Refresh Mechanism

Configuring RSVP-TE Refresh Mechanism


Enabling Srefresh in the mpls view on two nodes that are the neighbors of each other can reduce the cost and improve the performance of a network. In the MPLS view, Srefresh can be enabled on the entire device. After Srefresh is enabled, the retransmission of Srefresh messages is automatically enabled on the interface or the device.


The Srefresh mechanism in MPLS view is applied to the TE FRR networking. Srefresh is enabled globally on the Point of Local Repair (PLR) and Merge Point (MP) over an FRR bypass tunnel. This allows efficient use of network resources and improves Srefresh reliability.

Assume that a node initializes the retransmission interval as Rf seconds. If receiving no ACK message within Rf seconds, the node retransmits the RSVP message after (1 + Delta) x Rf seconds. The value of Delta depends on the link rate. The node retransmits the message until it receives an ACK message or the times of retransmission reach the threshold (that is, retransmission increment value).

Perform the following configurations on each node of the MPLS TE tunnel.


  • Perform the following steps in the MPLS view.
    1. Run system-view

      The system view is displayed.

    2. Run mpls

      The MPLS view is displayed.

    3. Run mpls rsvp-te srefresh

      Srefresh is enabled.

      By default, Srefresh is disabled globally.

  • Perform the following steps in the interface view.
    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 rsvp-te srefresh

      Srefresh is enabled.

      By default, Srefresh is disabled on all interfaces.

    5. (Optional) Run mpls rsvp-te timer retransmission { increment-value increment | retransmit-value interval } *

      The retransmission parameters are set.

      By default, increment is set to 1, and interval is set to 5000 milliseconds.

Updated: 2019-10-18

Document ID: EDOC1000178315

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