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CHAPTER 8: MULTICAST
First Page: Updates the system log entries, turn to the first page.
Next Page: Updates the group information entries, turn to the next page.
8.2 MLD SNOOPING
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: This is a function of the application software, not of MLD.)
When MLD snooping is enabled on a VLAN, the switch minimizes 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.
Listener
(MLD host)
Listener
(MLD host)
Switch
Source
MLD snooping enabled
FIGURE 8-6.
8.2.1 BASIC CONFIGURATION
The section will explain 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 Multicast, MLD Snooping and Basic Configuration.
2. Select to turn on or off the Global configuration parameters.
3. Select the port to join Router port and Fast Leave.
4. Scroll to select the Throtting mode with unlimited or 1 to 10.
