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724-746-5500 | blackbox.com
Page 81
Chapter 3: Configuration
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.
Figure 3-32. MLD Snooping Enabled screen.
3.6.1 Basic Configuration
This section will show you how to configure the MLD Snooping basic configuration and parameters:
Web Interface:
To configure the MLD Snooping Configuration in the Web interface:
1. Click Configuration, MLD Snooping, Basic Configuration.
2. Check to enable or disable the Global configuration parameters. Check the port to join Router port and Fast Leave.
3. Scroll to select the Throttling mode with unlimited or 1 to 10.
4. Click to save the setting.
5. To cancel the setting, click the Reset button to revert to previously saved values.
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