Huawei NetEngine80E Configuration Manual - Reliability page 111

HUAWEI NetEngine80E/40E Router
Configuration Guide - Reliability
l
Issue 02 (2011-09-10)
master device after the master device's priority has been changed. In this manner,
the VRRP status switches rapidly.
A VRRP backup group can track a maximum of eight BFD sessions and eight
interfaces simultaneously.
– When a BFD session or an interface tracked by the VRRP backup group goes
Down, the priority of the VRRP backup group may increase or reduce. If it is
configured that the priority always increases every time a BFD session or
interface goes Down, the priority of the VRRP backup group in the Backup
state can exceed that in the Master state only when all the tracked BFD sessions
or interfaces go Down.
– If it is configured that the priority does not always increase every time a BFD
session or interface goes Down, as long as one or some BFD sessions or
interfaces go Down, the priority of the VRRP backup group in the Backup state
can exceed that in the Master state, thus triggering VRRP fast switchover. Thus,
the increase of the priority caused by the down of other BFD sessions or
interfaces has no impact on VRRP fast switchover.
Or, run:
–
vrrp vrid virtual-router-id track bfd-session { bfd-session-id |
session-name bfd-configure-name } [ peer | link ]
The status of a link or peer BFD session is tracked.
When one of the following link BFD sessions is set up, you must run the
pst command to allow the BFD session to modify the status in an interface status
table before configuring a VRRP backup group to track the BFD session status.
Otherwise, the link BFD session status tracked by mVRRP is not the same as the
actual session status.
– BFD for static LSP
– BFD for LDP LSP
– BFD for CR-LSP
– BFD for TE
For VRRP for IPv6:
1. Run:
system-view
The system view is displayed.
2. Run:
interface interface-type interface-number[.subinterface-number ]
The view of the interface configured with the VRRP backup group is displayed.
3. Run:
–
vrrp6 vrid virtual-router-id track bfd-session { session-id | session-
name bfd-configure-name } [ increased value-increased | reduced value-
reduced ]
The normal BFD session is tracked.
increased value-increased: specifies the value by which the priority increases
when the tracked BFD session goes Down. It is an integer ranging from 1 to 255.
The maximum value of the priority is 254 because 255 is reserved for only the IP
address owner.
reduced value-reduced: specifies the value by which the priority decreases when
the tracked BFD session goes Down. The value is an integer ranging from 1 to
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4 VRRP Configuration
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