Data Preparation
To configure VLL 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
4.9.2 (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.
Step 2 Run:
interface interface-type interface-number
The AC interface view is displayed.
Step 3 Run:
mpls l2vpn reroute { { delay delay-time | immediately } [ resume resume-time ] |
never }
The revertive switchover policy is configured.
The types of the revertive switchover on PEs are as follows:
l Immediate revertive switchover: The local PE immediately switches traffic to the master PW
and notifies the fault to the remote PE of the backup PW. The PE notifies the fault recovery
to the remote PE of the backup PW after the period of resume-time.
l Delayed revertive switchover: The PE switches traffic to the master PW after the period of
delay-time.
l None revertive switchover: The PE does not switch traffic to the master PW until the backup
PW fails.
In the asymmetric PW FRR networking, if ACs are Ethernet links, then:
l If the remote shutdown function is configured on the interface of a PE that connects a CE,
do not use the policy of immediate revertive switchover, because this policy may lead to
network flapping and traffic loss. You can use the policy of delayed revertive switchover
and set delay-time equal to or more than 30 seconds.
4 VLL Configuration
Quidway S9300 Terabit Routing Switch
Configuration Guide - VPN
4-30 Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
Issue 03 (2009-08-20)
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