Huawei NetEngine80E Configuration Manual - Reliability page 104

HUAWEI NetEngine80E/40E Router
Configuration Guide - Reliability
l
Issue 02 (2011-09-10)
– By default, when the tracked interface is Down, the priorities of routers in the
tracking backup group decrease by 10.
– increased value-increased: specifies the value by which the priority increases
when the tracked interface goes Down. The value ranges 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 interface goes Down. The value ranges from 1 to 255. The lowest
priority is 0.. The priority 0 is reserved in the system for special use. When the
backup device receives a VRRP Advertisement packet with the priority 0, it
immediately switches to be the master device.
– When a VRRP backup group tracks BFD sessions and interfaces concurrently, the
allowable maximum number of tracked BFD sessions and interfaces is eight.
– 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 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.
NOTE
One router can track up to eight interfaces. When the router is the IP address owner, the
router cannot be configured to track the interface status. At present, the status of the loopback
interface, NULL interface, CPOS interface, and AUX interface cannot be tracked.
For VRRP for IPv6, run the following commands:
1. Run:
system-view
The system view is displayed.
2. Run:
interface interface-type interface-number
The interface view is displayed.
3. Run:
vrrp6 vrid virtual-router-id track interface interface-type interface-
number [ increased value-increased | reduced value-reduced ]
The status of the specified interface is tracked.
– By default, when the tracked interface goes Down, the priority of the tracking
VRRP backup group decreases by 10.
– increased value-increased specifies the value by which the priority increases when
the tracked interface goes Down. The value ranges 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 interface goes Down. The value ranges from 1 to 255. The lowest
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4 VRRP Configuration
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