Configuring Auto-Rp - Cisco Catalyst 4500 Series Configuration Manual

Chapter 35 Configuring IP Multicast

Configuring Auto-RP

Auto-rendezvous point (Auto-RP) automates the distribution of group-to-rendezvous point (RP)
mappings in a PIM network. To make Auto-RP work, a router must be designated as an RP mapping
agent, which receives the RP announcement messages from the RPs and arbitrates conflicts. The RP
mapping agent then sends the consistent group-to-RP mappings to all other routers by way of dense
mode flooding.
All routers automatically discover which RP to use for the groups they support. The Internet Assigned
Numbers Authority (IANA) has assigned two group addresses, 224.0.1.39 and 224.0.1.40, for Auto-RP.
The mapping agent receives announcements of intention to become the RP from Candidate-RPs. The
mapping agent then announces the winner of the RP election. This announcement is made independently
of the decisions by the other mapping agents.
To configure a rendezvous point, perform this task:
Command or Action
Step 1
Switch> enable
Step 2
Switch# configure terminal
Step 3
Switch(config)# ip multicast-routing
Step 4
Switch(config)# interface [FastEthernet |
GigabitEthernet | Loopback | Null |
Port-channel | TenGigabitEthernet | Tunnel |
Vlan] number
Step 5
Switch(config-if)# ip pim [sparse-mode |
sparse-dense-mode]
Step 6
Switch(config-if)# exit
Step 7
Repeat Steps 4 and 5 on all PIM interfaces.
Step 8
Switch(config)# ip pim autorp listener
OL-25340-01
Purpose
Enables privileged EXEC mode.
Enters global configuration mode.
Enables IP multicast routing.
Selects an interface that is connected to hosts on which PIM
can be enabled.
Enables PIM sparse or sparse-dense mode on an interface.
When configuring Auto-RP in sparse mode, you must also
configure the Auto-RP listener in the next step.
Returns to global configuration mode.
—
Causes IP multicast traffic for the two Auto-RP groups
224.0.1.39 and 224.0.1.40 to be PIM dense mode flooded
across interfaces operating in PIM sparse mode.
• Skip this step if you are configuring sparse-dense mode
in Step 8.
Software Configuration Guide—Release IOS XE 3.3.0SG and IOS 15.1(1)SG
Configuring IP Multicast Routing
35-17