Understanding How Mldv2 Snooping Works; Mldv2 Snooping Overview - Cisco 7604 Configuration Manual
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Understanding How MLDv2 Snooping Works
Understanding How MLDv2 Snooping Works
These sections describe MLDv2 snooping:
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MLDv2 Snooping Overview
MLDv2 snooping allows Cisco 7600 series routers to examine MLDv2 packets and make forwarding
decisions based on their content.
You can configure the router to use MLDv2 snooping in subnets that receive MLDv2 queries from either
MLDv2 or the MLDv2 snooping querier. MLDv2 snooping constrains IPv6 multicast traffic at Layer 2
by configuring Layer 2 LAN ports dynamically to forward IPv6 multicast traffic only to those ports that
want to receive it.
MLDv2, which runs at Layer 3 on a multicast router, generates Layer 3 MLDv2 queries in subnets where
the multicast traffic needs to be routed. For information about MLDv2, see this publication:
http://www.cisco.com/en/US/docs/ios/ipv6/configuration/guide/12_2sx/ipv6_12_2sx_book.html
You can configure the MLDv2 snooping querier on the router to support MLDv2 snooping in subnets
that do not have any multicast router interfaces. For more information about the MLDv2 snooping
querier, see the
MLDv2 (on a multicast router) or the MLDv2 snooping querier (on the supervisor engine) sends out
periodic general MLDv2 queries that the router forwards through all ports in the VLAN, and to which
hosts respond. MLDv2 snooping monitors the Layer 3 MLDv2 traffic.
PFC/DFC 3B/3BXL does not support source-only Layer 2 entries and therefore IPv6 multicast flooding
Note
cannot be prevented in a source-only network.
If a multicast group has only sources and no receivers in a VLAN, MLDv2 snooping constrains the
Note
multicast traffic to only the multicast router ports.
Cisco 7600 Series Router Cisco IOS Software Configuration Guide, Release 12.2SX
29-2
MLDv2 Snooping Overview, page 29-2
MLDv2 Messages, page 29-3
Source-Based Filtering, page 29-3
Explicit Host Tracking, page 29-3
MLDv2 Snooping Proxy Reporting, page 29-4
Joining an IPv6 Multicast Group, page 29-4
Leaving a Multicast Group, page 29-6
Understanding the MLDv2 Snooping Querier, page 29-7
"Enabling the MLDv2 Snooping Querier" section on page
Chapter 29
Configuring MLDv2 Snooping for IPv6 Multicast Traffic
29-9.
OL-4266-08
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