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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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(Optional) Configuring the MPLS TTL Processing Mode

(Optional) Configuring the MPLS TTL Processing Mode

Context

MPLS processes the TTL in the following modes:

  • MPLS TTL processing modes

    In MPLS VPN applications, the MPLS backbone network needs to be shielded to ensure network security. The MPLS Pipe mode on the ingress node is recommended for private network packets. To reflect the path where packets pass, use the MPLS Uniform mode on the ingress node.

  • Path where ICMP response packets are transmitted

    By default, when the received MPLS packet contains only one label, the LSR directly sends an ICMP response packet to the sender using an IP route. When the received MPLS packet contains multiple labels, the LSR sends an ICMP response packet to the sender along an LSP.

    The MPLS VPN packets may contain only one label when they arrive at an autonomous system boundary router (ASBR) on the MPLS VPN, or a superstratum PE (SPE) device in HoVPN networking. These devices have no IP routes to the sender, so they forward the ICMP response packets along an LSP.

Procedure

  • Configuring the MPLS TTL processing mode

    Perform the following steps on the ingress node.

    1. Run system-view

      The system view is displayed.

    2. Run undo ttl propagate

      The MPLS TTL processing mode is set to Pipe.

      Or, run ttl propagate

      The MPLS TTL processing mode is set to Uniform.

      By default, the TTL propagate function is enabled and the MPLS TTL processing mode is Uniform.

      NOTE:

      The ttl propagate command only take effect on LSPs that are to be set up. Before using the function on LSPs that have been set up, run the reset mpls ldp command to reestablish the LSPs.

  • Configuring the path where ICMP response packets are transmitted

    Perform the following steps on the ingress and egress nodes.

    1. Run system-view

      The system view is displayed.

    2. Run mpls

      The MPLS view is displayed.

    3. Run undo ttl expiration pop

      The device is configured to transmit ICMP response packets along an LSP.

      Or, run ttl expiration pop

      The device is configured to transmit ICMP response packets using an IP route.

      By default, upon receiving an MPLS packet with one label, an LSR returns an ICMP response packet using a local IP route.

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Updated: 2019-10-18

Document ID: EDOC1000178315

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