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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 Flooding Threshold

Configuring Flooding Threshold


The bandwidth flooding threshold indicates the ratio of the link bandwidth occupied or released by a TE tunnel to the link bandwidth remained in the TEDB.

If the link bandwidth changes little, bandwidth flooding wastes network resources. For example, if link bandwidth is 100 Mbit/s and 100 TE tunnels (with bandwidth as 1 Mbit/s) are created along this link, bandwidth flooding need be performed for 100 times.

If the flooding threshold is set to 10%, bandwidth flooding is not performed when tunnel 1 to tunnel 9 are created. When tunnel 10 is created, the bandwidth of tunnel 1 to tunnel 10 (10 Mbit/s in total) is flooded. Similarly, bandwidth flooding is not performed when tunnel 11 to tunnel 18 are created. When tunnel 19 is created, the bandwidth of tunnel 11 to tunnel 19 is flooded. Therefore, configuring bandwidth flooding threshold can reduce the times of bandwidth flooding and hence ensure the efficient use of network resources.

By default, on a link, IGP flood information about this link and CSPF updates the TEDB accordingly if one of the following conditions is met:

  • The ratio of the bandwidth reserved for an MPLS TE tunnel to the bandwidth remained in the TEDB is equal to or higher than 10%.

  • The ratio of the bandwidth released by an MPLS TE tunnel to the bandwidth remained in the TEDB is equal to or higher than 10%.

Perform the following configurations on the ingress or transit node of an MPSL TE tunnel.


  1. Run system-view

    The system view is displayed.

  2. Run interface interface-type interface-number

    The view of the MPLS-TE-enabled interface 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 bandwidth change thresholds { down | up } percent

    The threshold of bandwidth flooding is set.

Updated: 2019-10-18

Document ID: EDOC1000178315

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