Administrator Guide

To configure a global expiry time or to configure the expiry time for a particular (S,G) entry, 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.
Dell(conf)#ip pim sparse-mode sg-expiry-timer 1800
To display the expiry time configuration, use the show running-configuration pim command from EXEC Privilege mode.
Configuring a Static Rendezvous Point
The rendezvous point (RP) is a PIM-enabled interface on a router that acts as the root a group-specific 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
Dell#sh run int loop0
!
interface Loopback 0
ip address 1.1.1.1/32
ip pim sparse-mode
no shutdown
Dell#sh run pim
!
ip pim rp-address 1.1.1.1 group-address 224.0.0.0/4
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 configuration.
Use the following command if you have configured 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 configured RPs.
• Use the override option to override bootstrap router updates with your static RP configuration.
ip pim rp-address
To display the assigned RP for a group, use the show ip pim rp command from EXEC privilege mode.
Dell#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.
Dell#show ip pim rp mapping
PIM Group-to-RP Mappings
Group(s): 224.0.0.0/4, Static
RP: 165.87.50.5, v2
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 IP address of the interface out of which it is sent and a DR priority value. The router
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PIM Sparse-Mode (PIM-SM)