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Catalyst 3750-E and 3560-E Switch Software Configuration Guide
OL-9775-08
Chapter 46 Configuring IP Multicast Routing
Configuring IP Multicast Routing
To remove an RP address, use the no ip pim rp-address ip-address [access-list-number] [override]
global configuration command.
This example shows how to configure the address of the RP to 147.106.6.22 for multicast
gr
oup 225.2.2.2 only:
Switch(config)# access-list 1 permit 225.2.2.2 0.0.0.0
Switch(config)# ip pim rp-address 147.106.6.22 1
Configuring Auto-RP
Auto-RP uses IP multicast to automate the distribution of group-to-RP mappings to all Cisco routers and
multilayer switches in a PIM network. It has these benefits:
• It is easy to use multiple RPs within a network to serve different group ranges.
• It provides load splitting among different RPs and arrangement of RPs according to the location of
group participants.
• It avoids inconsistent, manual RP configurations on every router and multilayer switch in a PIM
network, which can cause connectivity problems.
Follow these guidelines when configuring Auto-RP:
• If you configure PIM in sparse mode or sparse-dense mode and do not configure Auto-RP, you must
manually configure an RP as described in the “Manually Assigning an RP to Multicast Groups”
section on page 46-24.
• If routed interfaces are configured in sparse mode, Auto-RP can still be used if all devices are
configured with a manual RP address for the Auto-RP groups.
• If routed interfaces are configured in sparse mode and you enter the ip pim autorp listener global
configuration command, Auto-RP can still be used even if all devices are not configured with a
manual RP address for the Auto-RP groups.
Step 3
access-list access-list-number {deny |
permit} source [source-wildcard]
Create a standard access list, repeating the command as many times as
necessary.
• For access-list-number, enter the access list number specified in
Step 2.
• The deny keyword denies access if the conditions are matched. The
permit keyword permits access if the conditions are matched.
• For source, enter the multicast group address for which the RP should
be used.
• (Optional) For source-wildcard, enter the wildcard bits in dotted
decimal notation to be applied to the source. Place ones in the bit
positions that you want to ignore.
Recall that the access list is always terminated by an implicit deny
s
tatement for everything.
Step 4
end Return to privileged EXEC mode.
Step 5
show running-config Verify your entries.
Step 6
copy running-config startup-config (Optional) Save your entries in the configuration file.
Command Purpose
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