Configuring The Multi-Homed Preference For A Vsi - Huawei quidway s7700 Configuration Manual

Quidway S7700 Smart Routing Switch
Configuration Guide - VPN
Step 9 is configured only when the PE communicates with non-Huawei devices. Before
performing Step 9, check the encapsulation type of the VSI on the peer PE. The local VSI and
peer VSI can communicate only when the VSI encapsulation type of the peer PE is the same as
that configured for the local PE. In VPLS BGP mode, the default encapsulation type of VPLS
packets is VLAN.
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7.9.3 Configuring the Multi-homed Preference for a VSI

If the VSIs of two PEs to which a CE is dual homed are Up, the PE with the higher priority
functions as the master PE, whereas the PE with the lower priority functions as the backup PE.
Therefore, you should not assign the same priority to the PEs, because this hinders the master/
backup PE negotiation.
Context
Do as follows on the PEs:
Procedure
Step 1 Run:
system-view
The system view is displayed.
Step 2 Run:
vsi vsi-name
The VSI view is displayed.
Step 3 Run:
multi-homing-preference preference-value
The multi-homed preference is configured for a VSI.
When the VSIs of the two PEs that a CE accesses are Up, the PE with the higher preference
serves as the active PE, and the PE with the lower preference works as the standby PE. In addition,
both PEs need be configured with different preferences to realize a smooth active/standby
negotiation.
The active PE is responsible for forwarding the traffic of the CE; the standby PE is only
responsible for checking whether the VSI of the active PE is Up. After a PE is selected as the
standby PE, the status of the VSI of the standby PE is set to Down. After the VSI of the active
PE becomes Down, the standby PE becomes the new active PE.
After the BGP session between the two PEs that a CE accesses becomes Down, the PW of the
PE with the lower preference becomes Up, and the PW between the two PEs becomes Up.
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Issue 01 (2011-07-15)
NOTE
The signaling protocol, RD, default-offset, site ID, and encapsulation type of the VSIs on the two PEs that
a CE accesses must be the same.
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7 VPLS Configuration
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