IPv6 Configuration Guide K/KA/KB.15.15

Example 57 MLD counters for a single VLAN
HP Switch# show ipv6 mld vlan 8 counters
MLD Service Vlan Counters
VLAN ID : 8 Name : VLAN8
Rx Tx
---- ----
V1 All Hosts Query 55 888
V2 All Hosts Query 0 0
V1 Group Specific Query 0 0
V2 Group Specific Query 0 0
Group and Source Specific Query 0 0
V2 Member Report 15 0
V1 Member Join 15 0
V1 Member Leave 30 0
Forward to Routers 83 0
Forward to VLAN 48 0
Errors:
Unknown MLD Type 2
Unknown Packet 3
Malformed Packet 0
Bad Checksum 0
Martian Source 0
Packet Received on MLD-disabled Interface 0
Interface Wrong Version Query 0
Port Counters:
Fast Leave : 4
Forced Fast Leave : 0
Membership Timeout : 8
MLD snooping
There are several roles that network devices may play in an IPv6 multicast environment:
MLD host
A network node that uses MLD to "join" (subscribe to) one or more multicast
groups.
Multicast router
A router that routes multicast traffic between subnets.
Querier
A switch or multicast router that identifies MLD hosts by sending out MLD queries
to which the MLD hosts respond.
A network node that acts as a source of IPv6 multicast traffic is only an indirect participant in MLD
snooping—it just provides multicast traffic, and MLD does not interact with it. (However, in an
application like desktop conferencing a network node may act as both a source and an MLD host,
but MLD interacts with that node only in its role as an MLD host.)
A source node creates multicast traffic by sending packets to a multicast address. In IPv6, addresses
with the first eight bits set (that is, "FF" as the first two characters of the address) are multicast
addresses, and any node that listens to such an address will receive the traffic sent to that address.
Application software running on the source and destination systems cooperates to determine what
multicast address to use. (This is a function of the application software, not of MLD.)
MLD snooping 79