Configuring a DR Priority

This task assumes that IPv6 PIM is configured on your network.

The DR priority option lets a network administrator give preference to a particular router in the DR election process by giving it a numerically higher DR priority. To set a DR priority higher than the default value of 1, use the ipv6 pim dr-priority command as shown in the following configuration example. 

device# configure terminal
device(config)# interface ethernet 3/2/4
device(config-if-e10000-3/2/4)# ipv6 pim dr-priority 50

To set a DR priority higher than the default value of 1 on a virtual Ethernet interface 10. 

device# configure terminal
device(config)# interface ve 10
device(config-vif-10)# ipv6 pim dr-priority 50

The following information may be useful for troubleshooting when setting the DR priority:

  • If more than one router has the same DR priority on a subnet (as in the case of default DR priority on all), the router with the numerically highest IPv6 address on that subnet will get elected as the DR.
  • The DR priority information is used in the DR election only if all the IPv6 PIM routers connected to the subnet support the DR priority option. If there is at least one IPv6 PIM router on the subnet that does not support this option, then the DR election falls back to the backwards compatibility mode in which the router with the numerically highest IPv6 address on the subnet is declared the DR regardless of the DR priority values.
Parent topic: IPv6 PIM Sparse