Cisco IE 4000, Software Configuration Manual

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Configuring IP Multicast Routing
Configuring IP Multicast Routing
Verifying SSM Mapping Configuration
Configuring a Rendezvous Point
You must have an RP if the interface is in sparse-dense mode and if you want to treat the group as a sparse group. You
can use several methods, as described in these sections:

Manually Assigning an RP to Multicast Groups, page 697

Configuring Auto-RP, page 699 (a standalone, Cisco-proprietary protocol separate from PIMv1)

Configuring PIMv2 BSR, page 704 (a standards track protocol in the Internet Engineering Task Force (IETF)
You can use Auto-RP, BSR, or a combination of both, depending on the PIM version you are running and the types of
routers in your network. For more information, see
PIMv1 and PIMv2 Interoperability, page 686 and the Auto-RP and BSR
Configuration Guidelines, page 686 .
Manually Assigning an RP to Multicast Groups
This section explains how to manually configure an RP. If the RP for a group is learned through a dynamic mechanism
(such as Auto-RP or BSR), you need not perform this task for that RP.
Senders of multicast traffic announce their existence through register messages received from the source’s first-hop
router (designated router) and forwarded to the RP. Receivers of multicast packets use RPs to join a multicast group by
using explicit join messages. RPs are not members of the multicast group; rather, they serve as a
meeting place for
multicast sources and group members.
You can configure a single RP for multiple groups defined by an access list. If there is no RP configured for a group, the
multilayer switch treats the group as dense and uses the dense-mode PIM techniques. This procedure is optional.
BEFORE YOU BEGIN
Review the Information About PIM, page 677 and Guidelines and Limitations, page 686 .
Command Purpose
show ip igmp ssm-mapping Display information about SSM mapping.
show ip igmp ssm-mapping
group-address
Display the sources that SSM mapping uses for a particular
group.
show ip igmp groups [ group-name |
group-address | interface-type
interface-number ] [ detail ]
Display the multicast groups with receivers that are directly
connected to the router and that were learned through IGMP.
show host Display the default domain name, the style of name lookup
service, a list of name server hosts, and the cached list of
hostnames and addresses.
debug ip igmp group-address Display the IGMP packets received and sent and IGMP
host-related events.