Cisco 7604 Configuration Manual page 449

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Configuring MLDv2 Snooping for IPv6 Multicast Traffic

Figure 29-1 Initial MLDv2 Listener Report

Multicast router A sends an MLDv2 general query to the router, which forwards the query to ports 2

through 5 (all members of the same VLAN). Host 1 wants to join an IPv6 multicast group and multicasts

an MLDv2 report to the group with the equivalent MAC destination address of 0x0100.5E01.0203.

When the router snoops the MLDv2 report multicast by Host 1, the router uses the information in the

MLDv2 report to create a forwarding-table entry, as shown in

of Host 1, the multicast router, and the router.

Table 29-1 MLDv2 Snooping Forwarding Table

Destination MAC Address

0100.5exx.xxxx

0100.5e01.0203

The router hardware can distinguish MLDv2 information packets from other packets for the multicast

group. The first entry in the table tells the router to send only MLDv2 packets to the CPU. This prevents

the router from becoming overloaded with multicast frames. The second entry tells the router to send

frames addressed to the 0x0100.5E01.0203 multicast MAC address that are not MLDv2 packets

(!MLDv2) to the multicast router and to the host that has joined the group.

If another host (for example, Host 4) sends an unsolicited MLDv2 report for the same group

message is not flooded to other ports. Any known multicast traffic is forwarded to the group and not to

Type of Packet

29-2), the router snoops that message and adds the port number of Host 4 to the forwarding table

29-2. Because the forwarding table directs MLDv2 messages only to the router, the

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

MLDv2 report

Understanding How MLDv2 Snooping Works

29-1, that includes the port numbers

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