The show router pim interface command is used on the Nokia 7750 SR to display detailed operational parameters for interfaces on which PIM is enabled. The output of this command explicitly includes the "DR Address" field, which shows the IP address of the router that has been elected as the Designated Router (DR) for that specific network segment. This provides a direct and unambiguous way to verify the PIM DR.

A. Show router pim status: This command provides global PIM information, such as the operational state, Rendezvous Point (RP) set, and Bootstrap Router (BSR) information, not per-interface DR details.

B. Show router pim neighbor: This command lists all discovered PIM neighbors on a link, their uptime, and hold timers, but it does not explicitly state which neighbor is the elected DR.

D. Show router pim statistics: This command displays counters for various PIM control messages (e.g., Hellos, Joins, Prunes). It is used for monitoring traffic, not for viewing state information like the DR.

1. Nokia 7450 ESS, 7750 SR, 7950 XRS, and VSR Multicast Routing Protocols Guide, Release 20.10.R1

Section: PIM Command Reference -> PIM Show Commands -> show router pim interface

Content: The documentation describes the command and provides sample output that includes the DR Address field. For example:

A:ALA-48# show router pim interface "system"

===============================================================================

PIM Interface "system"

===============================================================================

Interface Name : system

IP Address : 10.10.10.1/32

Admin Status : Up Oper Status : Up

PIM Mode : Sparse PIM Oper Mode : Sparse

Hello Interval (s) : 30 Hello Expiry (s) : 88

DR Priority : 1 DR Address : 0.0.0.0

...

This sample confirms the command's utility for verifying the DR address. (Note: 0.0.0.0 indicates no DR is needed on a point-to-point or loopback interface).

2. Nokia 7750 SR OS MPLS Guide, Release 16.0.R1

Section: PIM -> Monitoring and Troubleshooting PIM

Content: This section details the use of various show commands for PIM verification. It specifies that show router pim interface is the command to check interface-specific PIM parameters, which includes the Designated Router. It contrasts this with show router pim neighbor for neighbor adjacencies and show router pim status for global state.