Cisco 3845 - Security Bundle Router Software Guide

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Cisco ME 3800X and 3600X Switch Software Configuration Guide
OL-23400-01
Chapter 33 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 33-4 and the “PIM SM” section on page 33-4). 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 33-8
• Multicast Routing Configuration Guidelines, page 33-9
• Configuring Basic Multicast Routing, page 33-10 (required)
• Configuring PIM Stub Routing, page 33-12 (optional)
• Configuring Source-Specific Multicast, page 33-13
• Configuring Source Specific Multicast Mapping, page 33-16
• Configuring a Rendezvous Point, page 33-22 (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 33-31 (required for non-Cisco PIMv2 devices to interoperate with
Cisco PIM v1 devices))
• Monitoring the RP Mapping Information, page 33-32 (optional)
• Troubleshooting PIMv1 and PIMv2 Interoperability Problems, page 33-32 (optional)
Default Multicast Routing Configuration
Table 33-2 shows the default multicast routing configuration.
Table 33-2 Default Multicast Routing Configuration
Feature Default Setting
Multicast routing Disabled on all interfaces.
PIM version Version 2.
PIM mode No mode is defined.
PIM RP address None configured.
PIM domain border Disabled.
PIM multicast boundary None.

Cisco 3845 - Security Bundle Router Specifications

General

Brand	Cisco
Model	3845 - Security Bundle Router
Category	Switch
Language	English