reroute policy : delay 30 s, resume 0 s
reason of last reroute : Remote PSN fault
time of last reroute : 0 days, 0 hours, 18 minutes, 2 seconds
delay timer ID : -- rest time :--
resume timer ID : -- rest time :--
6.8 Configuring Static BFD for PW
This section describes how to configure static BFD for PW. After static BFD for PW is
configured, the fault on a PW can be rapidly detected and upper-layer applications can be
immediately switched.
6.8.1 Establishing the Configuration Task
Before configuring static BFD for PW, familiarize yourself with the applicable environment,
complete the pre-configuration tasks, and obtain the required data. This can help you complete
the configuration task correctly and quickly.
Applicable Environment
In MPLS-based L2VPNs, if PWs are set up between PEs, BFD can be used to detect faults of
the PWs. In this way, the speed for sensing link faults and the speed of the fast switchover of
applications at the upper layer are accelerated.
When the master and backup PWs are configured on a PE to protect links, BFD sessions need
to be set up to detect the master and backup PWs respectively.
When static BFD for PW is configured, BFD can work only in asynchronous mode.
BFD control packets are encapsulated in PW control packets, and PWs distinguish control
packets and data packets according to the control word. Therefore, during the configuration of
BFD for PW, the control word function needs to be enabled.
Pre-configuration Tasks
Before configuring static BFD for PW, complete the following tasks:
l Configuring IP parameters to make each node reachable
l Configuring PWs
NOTE
PWs must be set up on AC interfaces on PEs.
Data Preparation
To configure static BFD for PW, you need the following data.
No.
Data
1 Name of a BFD session
2 Interfaces where PWs reside (AC interfaces)
3 Local discriminator and remote discriminator of a BFD session
Quidway S7700 Smart Routing Switch
Configuration Guide - VPN 6 PWE3 Configuration
Issue 01 (2011-07-15) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
568
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