Filter
Top Products
DES-7200 Configuration Guide Chapter 9 MLD Snooping Configuration
9-2
Figure 1 Two types of MLD Snooping ports
Multicast Router Port: a multicast device of the switch to connect layer 3, e.g., Eth
0 / 1 port;
Member Port: the short form of the IPv6 multicast group member port, also called
Listener Port. For example, the Access Switch Eth0/2、Eth0/3 and Eth0/4 port.
9.1.2.2 Understanding MLD Profiles
MLD Profiles are actually some group filters, which can define a series of
multicast address ranges, and permit or deny the access of those multicast
addresses, providing usage for different functions of the following "multicast
address ranges for SVGL mode application", "multicast data area to be filtered by
router port", "MLD Filtering range", etc.
9.1.2.3 Understanding different kinds of
working modes of MLD Snooping
DISABLE mode: Under this mode, MLD Snooping is out of function, i.e., layer 2
multicast equipment does not "snoop" the MLD message between hosts and
router, and multicast frames are broadcast in VLAN.
IVGL (Independent VLAN Group Learn) working mode: Under this mode,
multicast stream among all VLANs is inter-independent. A host can only request
multicast stream from the router port in the same VLAN where the host is located;
switch can only transmit the multicast data flow being received from any VLAN to
listener ports in the same VLAN.
SVGL (Shared VLAN Group Learn) working mode: Under this mode, hosts of
each VLAN share a multicast stream and may request for multicast stream across
the VLAN. When specifying a shared VLAN, only the multicast data flow of the
VLAN may transmit to other hosts across the VLAN. So long as multicast data
flow belongs to Shared VLAN, they can be transmitted to the listener ports of this
multicast address, even if some listener ports do not belong to Shared VLAN.
Under SVGL mode, it is necessary to use MLD Profile to allocate a number of
multicast address ranges to SVGL, within such ranges the listener ports of the
multicast forwarding-table may transmit across VLAN. Under default condition, all