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2-6 MLD Snooping
Curiously enough, 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 doesn’t interact with it. (Note, however, that 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. (Note that this is a
function of the application software, not of MLD.)
When MLD snooping is enabled on a VLAN, the switch acts to minimize
unnecessary multicast traffic. If the switch receives multicast traffic destined
for a given multicast address, it forwards that traffic only to ports on the
VLAN that have MLD hosts for that address. It drops that traffic for ports on
the VLAN that have no MLD hosts
2-6.1 Basic Configuration
The section will let you understand how to configure the MLD Snooping
basic configuration and the parameters .