Leaving A Multicast Group - Cisco 7604 Configuration Manual

Ios software configuration guide

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Understanding How MLDv2 Snooping Works

Figure 29-2 Second Host Joining a Multicast Group

Table 29-2 Updated MLDv2 Snooping Forwarding Table

Destination MAC Address

0100.5exx.xxxx

0100.5e01.0203

Leaving a Multicast Group

These sections describe leaving a multicast group:

Normal Leave Processing

Interested hosts must continue to respond to the periodic MLDv2 general queries. As long as at least one

host in the VLAN responds to the periodic MLDv2 general queries, the multicast router continues

forwarding the multicast traffic to the VLAN. When hosts want to leave a multicast group, they can

either ignore the periodic MLDv2 general queries (called a "silent leave"), or they can send an MLDv2

filter mode change record.

When MLDv2 snooping receives a filter mode change record from a host that configures the EXCLUDE

mode for a group, MLDv2 snooping sends out a MAC-addressed general query to determine if any other

hosts connected to that interface are interested in traffic for the specified multicast group.

If MLDv2 snooping does not receive an MLDv2 report in response to the general query, MLDv2

snooping assumes that no other hosts connected to the interface are interested in receiving traffic for the

specified multicast group, and MLDv2 snooping removes the interface from its Layer 2 forwarding table

entry for the specified multicast group.

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

Normal Leave Processing, page 29-6

Fast-Leave Processing, page 29-7

Type of Packet

Configuring MLDv2 Snooping for IPv6 Multicast Traffic

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