Concept Guide

To congure a global expiry time, use the following command.
Enable global expiry timer for S, G entries.
CONFIGURATION mode
ip pim sparse-mode sg-expiry-timer seconds
The range is from 211 to 86,400 seconds.
The default is 210.
NOTE: The global expiry time for all [S, G] entries can vary from 360 to 420 seconds.
Conguring a Static Rendezvous Point
The rendezvous point (RP) is a PIM-enabled interface on a router that acts as the root a group-specic tree; every group must have an RP.
• Identify an RP by the IP address of a PIM-enabled or Loopback interface.
ip pim rp-address address group-address group-address mask [override]
Overriding Bootstrap Router Updates
PIM-SM routers must know the address of the RP for each group for which they have (*,G) entry.
This address is obtained automatically through the bootstrap router (BSR) mechanism or a static RP conguration.
Use the following command if you have congured a static RP for a group. If you do not use the override option with the following
command, the RPs advertised in the BSR updates take precedence over any statically congured RPs.
• Use the override option to use statically congured RP instead of the longest prex match of the congured group address
associated with a dynamic RP.
ip pim rp-address address {group-address group-address mask} [override]
Examples of Viewing the Rendezvous Point (Multicast Group) Information
To display the assigned RP for a group, use the show ip pim rp [mapping | group-address] command from EXEC privilege
mode.
Following is an example of show ip pim rp command output:
DellEMC#show ip pim rp
Group RP
225.0.1.40 165.87.50.5
226.1.1.1 165.87.50.5
To display the assigned RP for a group range (group-to-RP mapping), use the show ip pim rp mapping command in EXEC privilege
mode.
Following is an example of show ip pim rp mapping command output:
DellEMC#show ip pim rp mapping
PIM Group-to-RP Mappings
Group(s): 224.0.0.0/4, Static
RP: 165.87.50.5, v2
Conguring 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 address of the interface out of which it is sent and a DR priority value. The router
PIM Sparse-Mode (PIM-SM)
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