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Dell PowerEdge FN I/O Module Configuration Guide 9.10(0.0)

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Changing the Advertisement Interval

By default, the MASTER router transmits a VRRP advertisement to all members of the VRRP group every one second, indicating it is operational and is the MASTER router.

If the VRRP group misses three consecutive advertisements, the election process begins and the BACKUP virtual router with the highest priority transitions to MASTER.
  • NOTE: To avoid throttling VRRP advertisement packets, Dell Networking recommends increasing the VRRP advertisement interval to a value higher than the default value of one second. If you do change the time interval between VRRP advertisements on one router, change it on all participating routers.

If are using VRRP version 2, you must configure the timer values in multiple of whole seconds. For example a timer value of 3 seconds or 300 centisecs are valid and equivalent. However, a time value of 50 centisecs is invalid because it not a multiple of 1 second. If you are using VRRP version 3, you must configure the timer values in multiples of 25 centisecs.

If you are configured for VRRP version 2, the timer values must be in multiples of whole seconds. For example, timer value of 3 seconds or 300 centisecs are valid and equivalent.  However,  a timer value of 50 centisecs is invalid because it not is not multiple of 1 second.

If are using VRRP version 3, you must configure the timer values in multiples of 25 centisecs.

To change the advertisement interval in seconds or centisecs, use the following command. A centisecs is 1/100 of a second.

  1. Change the advertisement interval setting. INTERFACE-VRID mode advertise-interval seconds The range is from 1 to 255 seconds. The default is 1 second.

  2. For VRRPv3, change the advertisement centisecs interval setting. INTERFACE-VRID mode advertise-interval centisecs centisecs

The range is from 25 to 4075 centisecs in units of 25 centisecs.

The default is 100 centisecs.

Example of the advertise-interval Command

The following example shows how to change the advertise interval using the advertise-interval command. 

Dell(conf-if-te-1/1)#vrrp-group 111
                                 Dell(conf-if-te-1/1-vrid-111)#advertise-interval 10
                                 Dell(conf-if-te-1/1-vrid-111)#

The following example shows how to verify the advertise interval change using the show conf command 

Dell(conf-if-te-1/1-vrid-111)#show conf
                                 !
                                 vrrp-group 111
                                 
                                 advertise-interval 10
                                 authentication-type simple 7 387a7f2df5969da4
                                 no preempt
                                 priority 255
                                 virtual-address 10.10.10.1
                                 virtual-address 10.10.10.2
                                 virtual-address 10.10.10.3
                                 virtual-address 10.10.10.10
                                 Dell(conf-if-te-1/1-vrid-111)#

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