Users Guide

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
with the greatest priority value is the DR. If the priority value is the same for two routers, then the router with the greatest IP 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 pim dr-priority priority-value
• Change the interval at which a router sends hello messages.
INTERFACE mode
ip pim query-interval seconds
• Display the current value of these parameter.
EXEC Privilege mode
show ip pim interface
Creating Multicast Boundaries and Domains
A PIM domain is a contiguous set of routers that all implement PIM and are configured to operate within a common boundary defined by
PIM multicast border routers (PMBRs).
PMBRs connect each PIM domain to the rest of the Internet.
Create multicast boundaries and domains by filtering inbound and outbound bootstrap router (BSR) messages per interface. The following
command is applied to the subsequent inbound and outbound updates. Timeout removes existing BSR advertisements.
• Create multicast boundaries and domains by filtering inbound and outbound BSR messages per interface.
ip pim bsr-border
• Remove candidate RP advertisements.
clear ip pim rp-mapping
PIM Sparse-Mode (PIM-SM)
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