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Dell EMC SmartFabric OS10 User Guide Release 10.5.1

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Configure designated router priority

Multiple PIM-SM routers can connect to a single local area network (LAN) segment. One of these routers is elected as the designated router (DR).

The DR is elected using hello messages. Each PIM router learns about its neighbors by periodically sending a hello message from each PIM-enabled interface. Hello messages contain the interface IP address from where it is sent and a DR priority value. The router with the highest priority value becomes the DR. If the priority value is the same for two routers, the router with the highest IP address is the DR. By default, the DR priority value is 1, so the IP address determines the DR.

To configure DR priority, use the following command:

OS10# configure terminal
OS10(config)# interface vlan 100
OS10(conf-if-vl-100)# ip pim dr-priority 200

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