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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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Summary of MPLS TE Configuration Tasks

Summary of MPLS TE Configuration Tasks

MPLS TE is implemented after an MPLS TE tunnel is created and traffic is imported to the TE tunnel. To adjust MPLS TE parameters and deploy some security solutions, perform one or more of the following operations: adjusting RSVP-TE signaling parameters, adjusting the path of the CR-LSP, adjusting the establishment of MPLS TE tunnels and CR-LSP backup, configuring MPLS TE FRR, configuring MPLS TE tunnel protection group, configuring BFD for MPLS TE, and configuring RSVP GR.

Table 5-24  MPLS TE configuration tasks

Configuration Task



Create an MPLS TE tunnel

To transmit L2VPN or L3VPN services on the MPLS backbone network, and enable a tunnel to adapt to network topology changes to ensure stable data transmission, create an MPLS TE tunnel. MPLS TE tunnels can be created using the following methods:
  • Static MPLS TE Tunnels: Static MPLS TE tunnels are established using labels that are allocated manually but not by a signaling protocol to send control packets. Using static MPLS TE tunnels is recommended for a stable network with low-performance devices.

    Static MPLS TE tunnels have the highest priorities, which means that their bandwidth cannot be preempted. Static MPLS TE tunnels will not preempt bandwidth of other types of LSPs.

  • Dynamic MPLS TE Tunnels: Dynamic MPLS TE tunnels are established using the RSVP-TE signaling protocol that can adjust the path of an MPLS TE tunnel according to network changes. There is no need to manually configure each hop on a large scale network.

Configuring a Static MPLS TE Tunnel

Configuring a Dynamic MPLS TE Tunnel

Configure the MPLS TE tunnel to forward data traffic

An MPLS TE tunnel does not automatically direct traffic. To enable traffic to travel along an MPLS TE tunnel, use one of the following methods to import the traffic to the MPLS TE tunnel:

  • Use static routes

    This is the simplest method for importing the traffic to an MPLS TE tunnel.

  • Use tunnel policies

    In general, VPN traffic is forwarded through an LSP tunnel but not an MPLS TE tunnel. To import VPN traffic to the MPLS TE tunnel, you need to configure a tunnel policy.

  • Use the auto route mechanism

    A TE tunnel is used as a logical link for IGP route calculation. A tunnel interface is used as an outbound interface of a route.

Importing Traffic to an MPLS TE Tunnel

Adjust MPLS TE parameters

You can adjust MPLS TE parameters as required. The parameters are listed as follows:
  • RSVP Signaling Parameters

    RSVP signaling parameters include the RSVP reservation style, reservation confirmation, RSVP timer, summary refresh, Hello extension mechanism, and RSVP authentication. You can adjust these parameters to meet customer requirements.

  • CR-LSP Selection

    CSPF uses the TEDB and constraints to calculate appropriate paths and establishes CR-LSPs through the signaling protocol. MPLS TE provides multiple methods to control CSPF calculation, adjusting CR-LSP selection. The methods include:

    • Configuring the tie-breaking of CSPF
    • Configuring the metric for path calculation
    • Configuring the CR-LSP hop limit
    • Configuring route pinning
    • Configuring administrative group and affinity property
    • Configuring Shared Risk Link Group (SRLG)
    • Configuring the failed link timer
  • Establishment of MPLS TE Tunnels

    During the establishment of an MPLS TE tunnel, you may need to perform specified configurations in practical applications. MPLS TE provides multiple methods to adjust establishment of MPLS TE tunnels. The methods include:

    • Performing loop detection
    • Configuring route record and label record
    • Configuring re-optimization for CR-LSP
    • Configuring the tunnel reestablishment function
    • Configuring the RSVP signaling delay-trigger function
    • Configuring the tunnel priority

Adjusting RSVP-TE Signaling Parameters

Adjusting the Path of a CR-LSP

Adjusting the Establishment of an MPLS TE Tunnel

Configure MPLS TE reliability

MPLS TE provides multiple reliability technologies to ensure high reliability of key services transmitted over MPLS TE tunnels. The device supports the following reliability features for MPLS TE tunnels:
  • CR-LSP backup

    If a primary CR-LSP fails, traffic rapidly switches to a backup CR-LSP, ensuring uninterrupted traffic transmission.

  • TE FRR

    TE FRR is performed in manual or automatic mode:
    • TE Manual FRR

      It applies to scenarios with simple network topology.

    • TE Auto FRR

      It applies to scenarios with complicated network topology.

  • Tunnel protection group

    The tunnel protection group provides end-to end protection for MPLS TE tunnels. If a working tunnel in a protection group fails, traffic is switched to a protection tunnel.

  • BFD for RSVP

    BFD for RSVP applies to a TE FRR network, on which Layer 2 devices exist between the PLR and its RSVP neighboring nodes over the primary CR-LSP.

  • BFD for CR-LSP

    BFD for CR-LSP is used together with a hot-standby CR-LSP or a tunnel protection group.

  • BFD for TE tunnel

    BFD can monitor MPLS TE tunnels that are used as public network tunnels to transmit VPN traffic.


    RSVP graceful restart (GR) is a state recovery mechanism for dynamic CR-LSPs.

Configuring CR-LSP Backup

Configuring Association Between TE FRR and CR-LSP Backup

Configuring Manual TE FRR

Configuring Auto TE FRR

Configuring a Tunnel Protection Group

Configuring Dynamic BFD for RSVP

Configuring Static BFD for CR-LSPs

Configuring Dynamic BFD for CR-LSPs

Configuring Static BFD for TE Tunnels

Configuring RSVP GR

Updated: 2019-10-18

Document ID: EDOC1000178315

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