NOTE
S9300 does not support the dual-homed CE.
Pre-configuration Tasks
Before configuring PW FRR, complete the following tasks:
l Configuring a PW on each of the master path and backup path for the networking where
CEs are asymmetrically connected to PEs (The types of PWs on the master path and backup
path must be the same.)
l Configuring CEs to exchange routing information by using routing protocols or static routes
NOTE
In the networking where CEs are asymmetrically connected to PEs, the backup PW cannot transmit data
when the master path and backup path work normally. If the AC interface of the backup PW borrows the
IP address of the AC interface of the master PW, the following situations occur:
l A permanent non-revertive policy cannot be configured.
l The local CE has two equal-cost and direct routes to the remote CE. The destination addresses and next
hops of the two routes are the same. Actually, the route that passes through the backup PW is invalid.
l If CEs exchange routing information by using routing protocols, you need to modify the cost or metric
of the AC interface of the backup path to be greater than that of the AC interface of the master path.
The local CE cannot communicate with the peer CE, but can communicate with other user devices.
l If the AC link is an Ethernet link, the function of BFD for static routes need also be configured on CEs.
Data Preparation
To configure PW FRR, you need the following data.
No.
Data
1 Delay for revertively switching traffic when faults are cleared and the delay for
advertising fault recovery (by default, the delay for revertively switching traffic is 30
seconds and the delay for advertising fault recovery is 10 seconds.)
2 Link type of the AC interface
5.8.2 (Optional) Configuring the Revertive Switchover Policy
Context
When CEs are asymmetrically connected to PEs, do as follows on the PE (where traffic is
switched) to which the CE is connected through a single link.
Procedure
Step 1 Run:
system-view
The system view is displayed.
5 PWE3 Configuration
Quidway S9300 Terabit Routing Switch
Configuration Guide - VPN
5-28 Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
Issue 03 (2009-08-20)
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