Cisco 7604 Configuration Manual page 477

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Configuring PIM Snooping

This chapter describes how to configure protocol independent multicast (PIM) snooping on the

Cisco 7600 series routers. Release 12.2(17a)SX and later releases support PIM snooping.

For complete syntax and usage information for the commands used in this chapter, refer to the Cisco IOS

Master Command List, Release 12.2SX at this URL:

http://www.cisco.com/en/US/docs/ios/mcl/122sxmcl/12_2sx_mcl_book.html

This chapter consists of these sections:

For additional information (including configuration examples and troubleshooting information), see the

documents listed on this page:

http://www.cisco.com/en/US/products/hw/routers/ps368/tsd_products_support_series_home.html

Understanding How PIM Snooping Works

In networks where a Layer 2 router interconnects several routers, such as an Internet exchange point

(IXP), the router floods IP multicast packets on all multicast router ports by default, even if there are no

multicast receivers downstream. With PIM snooping enabled, the router restricts multicast packets for

each IP multicast group to only those multicast router ports that have downstream receivers joined to that

group. When you enable PIM snooping, the router learns which multicast router ports need to receive

the multicast traffic within a specific VLAN by listening to the PIM hello messages, PIM join and prune

messages, and bidirectional PIM designated forwarder-election messages.

Understanding How PIM Snooping Works, page 31-1

Default PIM Snooping Configuration, page 31-4

PIM Snooping Configuration Guidelines and Restrictions, page 31-4

Configuring PIM Snooping, page 31-5

Cisco 7600 Series Router Cisco IOS Software Configuration Guide, Release 12.2SX

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