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Routing & Switching · Advanced

PIM Designated Router

The PIM router elected on a multiaccess segment (highest DR priority, then highest IP) to send joins and registers for local hosts.

Definition

On the source side the DR registers sources with the RP; on the receiver side it sends joins toward the RP or source. The PIM DR differs from the IGMPv2 querier, which is the lowest IP.

Example

ip pim dr-priority 100

Exam tip

PIM DR = highest IP; IGMPv2 querier = lowest IP. A favorite trick question.

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