Configuring Master And Backup Pws - Huawei quidway s7700 Configuration Manual

Quidway S7700 Smart Routing Switch
Configuration Guide - VPN
Data Preparation
To configure VLL FRR, you need the following data.
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5.9.2 Configuring Master and Backup PWs

In the networking where CEs are asymmetrically connected to PEs, you need to configure master
and backup PWs.
Context
l
Procedure
l
Issue 01 (2011-07-15)
NOTE
To configure a Martini VLL or PWE3 for VLL FRR, you must use the PW template to configure a PW,
enable the control word in the PW template.
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 The policy of none revertive switchover 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 CEs use static routes to exchange routing information, you need to modify the preference of the
backup route to be lower than that of the primary route (the greater the value, the lower the preference)
by using the ip route-static dest-ip-address mask out-interface preference preference-value
command.
Data
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.)
Link type of the AC interface
In the networking where CEs are asymmetrically connected to PEs, you need to configure
master and backup PWs. The master and backup PWs must be of the same type.
NOTE
VLL FRR supports only LDP PWs and BGP PWs, that is, Martini VLL and Kompella VLL.
When using XGE, GE, Ethernet, or Eth-Trunk interfaces as AC interfaces, you need to run the undo
portswitch command in the current interface view before configuring master and backup PWs.
LDP PW
1. Run:
system-view
The system view is displayed.
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