42-8
Cisco ME 3400 Ethernet Access Switch Software Configuration Guide
OL-9639-07
Chapter 42 Configuring IP Multicast Routing
Configuring IP Multicast Routing
PIM uses both source trees and RP-rooted shared trees to forward datagrams (described in the “PIM
DM” section on page 42-4 and the “PIM SM” section on page 42-4). The RPF check is performed
differently for each:
• If a PIM router or multilayer switch has a source-tree state (that is, an (S,G) entry is present in the
multicast routing table), it performs the RPF check against the IP address of the source of the
multicast packet.
• If a PIM router or multilayer switch has a shared-tree state (and no explicit source-tree state), it
performs the RPF check on the RP address (which is known when members join the group).
Sparse-mode PIM uses the RPF lookup function to decide where it needs to send joins and prunes:
• (S,G) joins (which are source-tree states) are sent toward the source.
• (*,G) joins (which are shared-tree states) are sent toward the RP.
Dense-mode PIM uses only source trees and use RPF as previously described.
Configuring IP Multicast Routing
• Default Multicast Routing Configuration, page 42-8
• Multicast Routing Configuration Guidelines, page 42-9
• Configuring Basic Multicast Routing, page 42-10 (required)
• Configuring PIM Stub Routing, page 42-12 (optional)
• Configuring Source-Specific Multicast, page 42-13
• Configuring Source Specific Multicast Mapping, page 42-17
• Configuring a Rendezvous Point, page 42-22 (required if the interface is in sparse-dense mode, and
you want to treat the group as a sparse group)
• Using Auto-RP and a BSR, page 42-32 (required for non-Cisco PIMv2 devices to interoperate with
Cisco PIM v1 devices))
• Monitoring the RP Mapping Information, page 42-33 (optional)
• Troubleshooting PIMv1 and PIMv2 Interoperability Problems, page 42-33 (optional)
Default Multicast Routing Configuration
Table 42-2 shows the default multicast routing configuration.
198.14.32.0/32 Fast Ethernet 0/1
204.1.16.0/24 Fast Ethernet 0/2
Table 42-1 Routing Table Example for an RPF Check (continued)
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