Allied Telesis AT-AR300 manual Where Stepvalue is a decimal number in the range 1 to

Software Release 2.3.1 27

If the PROPORTIONAL option is specified, the virtual router reduces the priority to a percentage of the original priority in proportion the percentage of available ports. For example, if a router has five ports and a port fails, the router will drop its priority by a fifth of the original priority.

SET VRRP=vr-identifier[ADINTERVAL=1..255] [AUTHENTICATION={NONEPLAINTEXT}] [PASSWORD=password] [PORTMONITORING={ONOFF} [STEPVALUE={stepvalue PROPORTIONAL}]] [PREEMPT={ONOFF}] [PRIORITY=1..254]

where:

■stepvalue is a decimal number in the range 1 to 254.

This command only changes the parameters on this router. It is important that all routers involved in a virtual router are configured with the same values for the VRRP virtual router identifier, IP address, advertisement interval, pre-empt mode, authentication type, and password. Inconsistent configuration will cause advertisement packets to be rejected and the virtual router will not perform properly.

The PORTMONITORING parameter is valid when the VR is providing redundancy over a VLAN. The PORTMONITORING parameter specifies whether the VRRP should monitor the ports of the VLAN and alter the priority value if ports fail or are disabled. If the PORTMONITORING parameter is set to ON, the STEPVALUE parameter may also be specified. The default is OFF.

The STEPVALUE parameter specifies the value by which the priority of the VR should be decremented each time a VLAN port fails, or is disabled when the PORTMONITORING parameter is set to ON. If a number is specified, the priority of the VR will be reduced by this value each time a VLAN port fails or is disabled. If PROPORTIONAL is specified, the VR will reduce the priority to a percentage of the original priority in proportion to the percentage of available ports. The value specified for the STEPVALUE parameter is retained when port monitoring is disabled.

For instance, to enable the PORTMONITORING feature on the virtual router number 10 and set the step value to 100, use the following command:

SET VRRP VRID=10 PORTMONITORING=ON STEPVALUE=100

The SHOW VRRP command now shows port monitoring information.

Table 7: New parameters displayed in the output of the SHOW VRRP command.

Parameter	Meaning
Port Monitoring	Indicates whether the port monitoring feature is ON or OFF.
	This parameter is only displayed if the VR is operating over
	a VLAN interface.
Step value	If a number is shown (e.g. “40”), this indicates the value by
	which the priority of the VR will be reduced for each VLAN
	port that fails or is disabled. If “PROPORTIONAL” is shown,
	the priority will be reduced in proportion to the percentage
	of VLAN ports that are out of service.

Software Release 2.3.1 C613-10325-00 REV B