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Configuring IP Multicast Routing
Configuring IP Multicast over ATM Point-to-Multipoint Virtual Circuits
IPC-436
Cisco IOS IP Configuration Guide
You must have ATM configured for multipoint signalling. Refer to the “Configuring ATM” chapter in
the Cisco IOS Wide-Area Networking Configuration Guide for more information on how to configure
ATM for point-to-multipoint signalling.
You also must have IP multicast routing and PIM sparse mode configured. This feature does not work
with PIM dense mode.
To configure IP multicast over ATM point-to-multipoint VCs, perform the tasks described in the
following sections. The task in the first section is required; the task in the remaining section is optional.
• Enabling IP Multicast over ATM Point-to-Multipoint VCs (Required)
• Limiting the Number of VCs (Optional)
Enabling IP Multicast over ATM Point-to-Multipoint VCs
To enable PIM to open ATM point-to-multipoint VCs for each multicast group that a receiver joins, use
the following commands in interface configuration mode on the ATM interface:
The atm multipoint-signaling interface configuration command is required so that static map
multipoint VCs can be opened. The router uses existing static map entries that include the broadcast
keyword to establish multipoint calls. You must have the map list to act like a static ARP table.
Use the show ip pim vc EXEC command to display ATM VC status information for multipoint VCs
opened by PIM.
See the “IP Multicast over ATM Point-to-Multipoint VC Example” section later in this chapter for an
example of how to enable IP multicast over ATM point-to-multipoint VCs.
Limiting the Number of VCs
By default, PIM can open a maximum of 200 VCs. When the router reaches this number, it deletes
inactive VCs so it can open VCs for new groups that might have activity. To change the maximum
number of VCs that PIM can open, use the following command in interface configuration mode:
Command Purpose
Step 1
Router(config-if)# ip pim multipoint-signalling
Enables IP multicast over ATM point-to-multipoint VCs.
Step 2
Router(config-if)# atm multipoint-signalling
Enables point-to-multipoint signaling to the ATM
switch.
Command Purpose
Router(config-if)# ip pim vc-count number
Changes the maximum number of VCs that PIM can open.