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Dell Configuration Guide for the S4048–ON System 9.14.2.4

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Configuring a Designated Router

Multiple PIM-SM routers might be connected to a single local area network (LAN) segment. One of these routers is elected to act on behalf of directly connected hosts. This router is the designated router (DR).

The DR is elected using hello messages. Each PIM router learns about its neighbors by periodically sending a hello message out of each PIM-enabled interface. Hello messages contain the IPv4 or IPv6 address of the interface out of which it is sent and a DR priority value. The router with the greatest priority value is the DR. If the priority value is the same for two routers, then the router with the greatest IPv4 or IPv6 address is the DR. By default, the DR priority value is 192, so the IP address determines the DR.
  • Assign a DR priority value.
    INTERFACE mode
    {ip | ipv6} pim dr-priority priority-value
  • Change the interval at which a router sends hello messages.
    INTERFACE mode
    {ip | ipv6} pim query-interval seconds
  • Display the current value of these parameter.
    EXEC Privilege mode
    show {ip | ipv6} pim interface

Example of Viewing PIM Enabled Interface

Following is an example of show ip pim summary command output:

DellEMC# show ip pim summary

PIM TIB version 495
Uptime 22:44:52
Entries in PIM-TIB/MFC : 2/2

Active Modes :
        PIM-SNOOPING

Interface summary:
        1 active PIM interface
        0 passive PIM interfaces
        3 active PIM neighbors

TIB summary:
       1/1 (*,G) entries in PIM-TIB/MFC
       1/1 (S,G) entries in PIM-TIB/MFC
       0/0 (S,G,Rpt) entries in PIM-TIB/MFC

       0 PIM nexthops
       0 RPs
       0 sources
       0 Register states

Message summary:
       2582/2583 Joins sent/received
       5/0 Prunes sent/received
       0/0 Candidate-RP advertisements sent/received
       0/0 BSR messages sent/received
       0/0 State-Refresh messages sent/received
       0/0 MSDP updates sent/received
       0/0 Null Register messages sent/received
       0/0 Register-stop messages sent/received

Data path event summary:
       0 no-cache messages received
       0 last-hop switchover messages received
       0/0 pim-assert messages sent/received
       0/0 register messages sent/received
DellEMC#

Following is an example of show ipv6 pim interface command output:

Dell#show ipv6 pim interface
Interface Ver/ Nbr   Query DR
          Mode Count Intvl Prio

Te 1/3   v2/S 1     30    1
  Address : fe80::201:e8ff:fe02:140f
  DR : this router

Te 1/11  v2/S 0     30    1
  Address : fe80::201:e8ff:fe02:1417
  DR : this router
Dell#

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