Huawei NetEngine80E Configuration Manual - Reliability page 190

HUAWEI NetEngine80E/40E Router
Configuration Guide - Reliability
Procedure
Step 1 Run:
system-view
The system view is displayed.
Step 2 Run:
interface interface-type interface-number [subinterface-number ]
The view of the interface where the VRRP IPv6 backup group is configured is displayed.
Step 3 Run either of the following commands:
l
l
Issue 02 (2014-09-30)
vrrp6 vrid virtual-router-id track bfd-session { session-id | session-name bfd-
configure-name } [ increased value-increased | reduced value-reduced ]
The VRRP IPv6 backup group is configured to track a common BFD session. During the
configuration, use either of the following parameters as needed:
– increased value-increased: specifies the value by which the VRRP priority increases if
the tracked BFD session becomes Failed. The value is an integer ranging from 1 to 255.
Only the IP address owner has priority value 255. The greatest priority value that can be
set is 254.
– reduced value-reduced: specifies the value by which the VRRP priority reduces if the
tracked BFD session becomes Failed. The value is an integer ranging from 1 to 255. The
smallest priority value can be set to 1. Priority value 0 is reserved for special use. If a
backup device receives a VRRP IPv6 Advertisement packet carrying the priority value
of 0, the backup device immediately preempts the Master state. By default, the priority
value reduces by 10 if a BFD session tracked by a VRRP IPv6 backup group becomes
Failed.
A changed VRRP priority of a backup device must be higher than that of the master device,
allowing a rapid master/backup VRRP switchover.
A VRRP IPv6 backup group can track a maximum of eight BFD sessions and interfaces.
– If all devices in a VRRP IPv6 backup group increase their priority values each time a
tracked BFD session or interface goes Down, the increased VRRP priority value of a
backup device will become the highest after all the tracked BFD sessions or interfaces go
Down. This change will trigger a master/backup VRRP switchover.
– If some devices in a VRRP IPv6 backup group increase their priority values each time a
tracked BFD session or interface goes Down, a master/backup VRRP switchover can be
triggered after the VRRP priority value of a backup device becomes the highest. After
the switchover is complete, another priority increase will not trigger a VRRP switchover
or affect the link status.
vrrp6 vrid virtual-router-id track bfd-session { session-id | session-name bfd-
configure-name } [ peer | link ]
The VRRP IPv6 backup group is configured to track a link or peer BFD session.
Before configuring a VRRP IPv6 backup group to track a link BFD session, run the process-
pst command to allow the BFD session to modify the port status table (PST). If this command
is not used, the VRRP IPv6 backup group tracks the link BFD session status incorrectly and
obtains incorrect tracking results. This command applies to the following types of link BFD
sessions:
– BFD for static LSP
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