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NE20E-S2 V800R010C10SPC500 Feature Description - MPLS 01

This is NE20E-S2 V800R010C10SPC500 Feature Description - MPLS
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MPLS TE Tunnel Protection Group

MPLS TE Tunnel Protection Group

A tunnel protection group protects E2E MPLS TE tunnels. If a working tunnel in a protection group fails, traffic switches to a protection tunnel, minimizing traffic interruptions.

Related Concepts

Concepts related to a tunnel protection group are as follows:

  • Working tunnel: a tunnel to be protected.

  • Protection tunnel: a tunnel that protects a working tunnel.

  • Protection switchover: switches traffic from a faulty working tunnel to a protection tunnel in a tunnel protection group, which improves network reliability.

Figure 4-31 illustrates a tunnel protection group.

Figure 4-31 Tunnel protection group

Primary tunnels tunnel-1 and the protection tunnel tunnel-2 are established on the ingress LSRA on the network shown in Figure 4-31.

Tunnel-2 is configured as a protection tunnel for primary tunnel tunnel-1 on LSRA. If the configured fault detection mechanism on the ingress detects a fault in tunnel-1, traffic switches to tunnel-2. LSRA attempts to reestablish tunnel-1. If tunnel-1 is successfully established, traffic switches back to the primary tunnel.

Implementation

An MPLS TE tunnel protection group uses a configured protection tunnel to protect traffic on the working tunnel to improve tunnel reliability. To ensure the improved performance of the protection tunnel, the protection tunnel must exclude links and nodes through which the working tunnel passes during network planning.

Table 4-12 describes the implementation procedure of a tunnel protection group.

Table 4-12 Implementation procedure of a tunnel protection group

Sequence Number

Process

Description

1

Establishment

The working and protection tunnels must have the same ingress and destination address. The protection tunnel is established in the same procedure as a regular tunnel. The protection tunnel can use attributes that differ from those for the working tunnel. Ensure that the working and protection tunnels are established over different paths as much as possible.
NOTE:
  • A protection tunnel cannot be protected or enabled with TE FRR.

  • Attributes for a protection tunnel can be configured independently of those for the working tunnel, which facilitates the network planning.

  • The primary and protection tunnels must be bidirectional. The following types of bidirectional tunnels are supported:

    • Dynamic bidirectional associated LSPs

    • Static bidirectional associated LSPs

    • Static bidirectional co-routed LSPs

2

Binding between the working and protection tunnels

The protection tunnel is bound to the tunnel ID of the working tunnel so that the two tunnels form a tunnel protection group.

3

Fault detection

MPLS OAM/MPLS-TP OAM is used to detect faults in a tunnel protection group to speed up protection switching.

4

Protection switching

The tunnel protection group supports either of the following protection switching modes:
  • Manual switching: Traffic is forcibly switched to the protection tunnel.
  • Automatic switching: Traffic automatically switches to the protection tunnel if the working tunnel fails.
A time interval can be set for automatic switching.

An MPLS TE tunnel protection group only supports bidirectional switching. If a traffic switchover is performed for traffic in one direction, a traffic switchover is also performed for traffic in the opposite direction.

5

Switchback

After a traffic switchover is implemented, the ingress attempts to reestablish the working tunnel. If the working tunnel is reestablished, the ingress can switch traffic back to the working tunnel or still forward traffic over the protection tunnel.

Differences Between CR-LSP Backup and a Tunnel Protection Group

CR-LSP backup and a tunnel protection group are both E2E protection mechanisms for MPLS TE. Table 4-13 shows the comparison between these two mechanisms.

Table 4-13 Comparison between CR-LSP backup and a tunnel protection group

Item

CR-LSP Backup

Tunnel Protection Group

Object to be protected

Primary and backup CR-LSPs are established on the same tunnel interface. A backup CR-LSP protects traffic on a primary CR-LSP.

One tunnel protects traffic over another tunnel in a tunnel protection group.

TE FRR

A primary CR-LSP supports TE FRR. A backup CR-LSP does not support TE FRR.

A working tunnel supports TE FRR. A protection tunnel does not support TE FRR.

LSP attributes

Primary and backup CR-LSPs have the same attributes, except for the TE FRR attribute. In addition, the bandwidth for the backup CR-LSP can be set separately.

The attributes of one tunnel in a tunnel protection group are independent of the attributes of the other tunnel. For example, a protection tunnel with no bandwidth can protect traffic on a working tunnel that has a bandwidth.

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Updated: 2019-01-02

Document ID: EDOC1100055471

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