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3-6 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
3-6.1 Basic Configuration
The section will let you understand how to configure the MLD Snooping basic configuration
and the parameters .
Web Interface
To configure the MLD Snooping Configuration in the web interface:
1. Click Configuration, MLD Snooping, Basic Configuration
2. Evoke to enable or disable the Global configuration parameters
Evoke the port to join Router port and Fast Leave.
3. Scroll to select the Throtting mode with unlimited or 1 to 10
4. Click the save to save the setting
5. If you want to cancel the setting then you need to click the Reset button.
It will revert to previously saved values
Figure 3-6.1: The MLD Snooping Basic Configuration.
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Publication date: March, 2012
Revision A1
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