PLANET XGS3-24040 - Manual (Page 815)

55-1
Chapter 55 Commands for IPv6
VRRPv3 Configuration
55.1 advertisement-interval
Command: advertisement-interval <adver_interval>
Function: Configure the advertisement interval of VRRPv3.
Parameters: <adver_interval> is the interval of sending VRRPv3 advertisement messages, in
centiseconds, ranging from 100 to 1000, and has to be a multiple of 100.
Command Mode: VRRPv3 Protocol Mode.
Default: <adver_interval> is 100 centiseconds (1 second) by default.
Usage Guide: The Master in a VRRPv3 backup group will send a VRRPv3 message to notify other
routers (layer-three switches) in the group that it is working normally at intervals. This interval is
adver_interval. If the Backup hasn’t received any VRRPv3 message from Master over a certain period
of time (the length of the time is master_down_interval), it will assume that the master is not working
normally and will change the state of itself to Master.
Uses can use this command to adjust the interval of VRRPv3 advertisement messages sent by
Master. For the members in the same backup group, this attribute should have same value. For Backup,
the value of its master_down_interval should be three times more than adver_interval. If the network
flow is too big or different routers (or layer-three switches) have different timers, master_down_interval
might has a time-out, which will cause a state change as a result. This kind of situation can be solved by
prolonging adver_interval or setting a longer preempts delay time.
Example: Configure the VRRPv3 advertisement interval as 300 centiseconds.
Switch(config-router)# advertisement-interval 300
55.2 circuit-failover
Commands: circuit-failover {vlan<ID>| IFNAME} <value_reduced>
no circuit-failover
Function: Configures the VRRPv3 monitor interface.
Parameters: {vlan<ID>| IFNAME} is the name for the interface to be monitored.
<value_reduced> stands for the amount of priority decreased, the range value is from 1 to
253.
Command mode: VRRPv3 Protocol Configuration Mode.
Default: Not configured by default.
Usage Guide: The interface monitor function is a valuable extension to backup function, which not only
enable VRRPV3 to provide backup function on router (or L3 Ethernet switch) fail, but also allow
decreasing the priority of a router (or L3 Ethernet switch) to ensure smooth implementation of backup
function when status of that network interface is down.
When this command is used, if the status of an interface monitored turns from up to down, then the
priority of that very router (or L3 Ethernet switch) in its Standby cluster will decrease (If the priority of that
value_reduced is higher than interface configuration, then the corresponding router is down, the priority
of interface in Backup decrease until 0), lest Backup cannot changes its status due to lower priority than
the Master when the Master fails. After the interface monitored turns up over again, the priority of
corresponding router (or L3 Ethernet switch) will restore in Backup.
Example: Configuring VRRPv3 monitor interface to VLAN 2 and decreasing amount of priority to 10.
Switch(Config-router)# circuit-failover vlan 2 10