Configuring a DR Priority

The DR priority option lets you give preference to a particular device in the DR election process by assigning it a numerically higher DR priority. This value can be set for IPv4 interfaces. To set a DR priority higher than the default value of 1, use the ip pim dr-priority command as shown in the following configuration example: 

device# configure terminal
device(config)# interface ethernet 1/3/24
device(config-if-e10000-1/3/24)# ip pim dr-priority 50

The following information may be useful for troubleshooting.

  • If more than one device has the same DR priority on a subnet (as in the case of default DR priority on all), the device with the numerically highest IP address on that subnet is elected as the DR.
  • The DR priority information is used in the DR election ONLY IF ALL the PIM devices connected to the subnet support the DR priority option. If there is at least one PIM device on the subnet that does not support this option, then the DR election falls back to the backwards compatibility mode in which the device with the numerically highest IP address on the subnet is declared the DR regardless of the DR priority values.
Parent topic: PIM Dense