Foundry Configuration Guide for the FESX, FSX, and FWSX
22 - 18 © Foundry Networks, Inc. December 2005
To disable preemption on a Backup, enter commands such as the following:
Router1(config)# inter e 1/6
Router1(config-if-1/6)# ip vrrp vrid 1
Router1(config-if-1/6-vrid-1)# non-preempt-mode
Syntax: non-preempt-mode
The syntax is the same for VRRP and VRRPE.
Forcing a Master Router To Abdicate to a Standby Router
You can force a VRRP Master to abdicate (give away control) of a VRID to a Backup by temporarily changing the
Master’s priority to a value less than the Backup’s.
The VRRP Owner always has priority 255. You can even use this feature to temporarily change the Owner’s
priority to a value from 1 – 254.
NOTE: When you change a VRRP Owner’s priority, the change takes effect only for the current power cycle. The
change is not saved to the startup-config file when you save the configuration and is not retained across a reload
or reboot. Following a reload or reboot, the VRRP Owner again has priority 255.
To temporarily change the Master’s priority, use the following CLI method.
To change the Master’s priority, enter commands such as the following:
FastIron SuperX Router(config)# ip int eth 1/6
FastIron SuperX Router(config-if-1/6)# ip vrrp vrid 1
FastIron SuperX Router(config-if-1/6-vrid-1)# owner priority 99
Syntax: [no] owner priority | track-priority <num>
The <num> parameter specifies the new priority and can be a number from 1 – 254.
When you press Enter, the software changes the priority of the Master to the specified priority. If the new priority
is lower than at least one Backup’s priority for the same VRID, the Backup takes over and becomes the new
Master until the next software reload or system reset.
To verify the change, enter the following command from any level of the CLI:
FastIron SuperX Router(config-if-1/6-vrid-1)# show ip vrrp
Total number of VRRP routers defined: 1
Interface ethernet 1/6
auth-type no authentication
VRID 1
state backup
administrative-status enabled
mode owner
priority 99
current priority 99
hello-interval 1 sec
ip-address 192.53.5.1
backup routers 192.53.5.2
This example shows that even though this Layer 3 Switch is the Owner of the VRID (“mode owner”), the Layer 3
Switch’s priority for the VRID is only 99 and the state is now “backup” instead of “active”. In addition, the
administrative status is “enabled”.
To change the Master’s priority back to the default Owner priority 255, enter “no” followed by the command you
entered to change the priority. For example, to change the priority of a VRRP Owner back to 255 from 99, enter
the following command:
FastIron SuperX Router(config-if-1/6-vrid-1)# no owner priority 99
You cannot set the priority to 255 using the owner priority command.
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