3Com Switch 8800 Advanced Software V5 Configuration Guide

770 CHAPTER 54: VRRP CONFIGURATION
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CAUTION:
■ The priority of an IP address owner is always 255 and not configurable.
■ Interface tracking is not configurable to an IP address owner.
■ Tracked interfaces can only be VLAN interfaces.
■ The priority of a device is restored if the state of the interface under tracking
changes from down to up.
Configuring VRRP Packet
Attributes
Configuration prerequisites
Before configuring the relevant attributes of VRRP packets, you should first create
the standby group and configure the virtual IP address.
Configuration procedure
Follow these steps to configure VRRP packet attributes:
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■ You may configure different authentication modes and authentication keys for
the standby groups on an interface. However, the members of the same
standby group must use the same authentication mode and authentication key.
■ Factors like excessive traffic or different timer setting on switches can cause the
Backup timer to time-out abnormally and trigger a change of the state. To
Configure the switch in the
standby group to work in
preemption mode and
configure preemption delay
vrrp vrid virtual-router-id
preempt-mode [ timer
delay delay-value ]
Optional
The switch in the standby
group works in preemption
mode and the preemption
delay is 0 seconds by default.
If the switch in the standby
group works in non
preemption mode, the
preemption delay changes to
zero seconds automatically.
Configure the interface to be
tracked
vrrp vrid virtual-router-id
track interface interface-type
interface-number [ reduced
priority-reduced ]
Optional
No interface is being tracked
by default.
To do... Use the command... Remarks
To do... Use the command... Remarks
Enter system view system-view -
Enter VLAN interface view interface interface-type
interface-number
-
Configure the authentication
mode and authentication key
when the standby groups
send and receive VRRP
packets
vrrp vrid virtual-router-id
authentication-mode { md5
| simple } key
Optional
Authentication is not
performed by default
Configure the time interval for
the Master in the standby
group to send VRRP
advertisement
vrrp vrid virtual-router-id
timer advertise
adver-interval
Optional
1 second by default
Disable TTL check on VRRP
packets
vrrp un-check ttl Optional
Enabled by default