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LGB5128A User Manual
76
Port :
Switch port number.
Mode :
Indicates the filtering mode maintained per (VLAN ID, port number, Group Address) basis.
It can be either Include or Exclude.
Source Address :
IP Address of the source. Currently, system limits the total number of IP source addresses
for filtering to be 128.
Type :
Indicates the Type. It can be either Allow or Deny.
Auto-refresh
Click on the auto-refresh box and the device will refresh the log automatically.
Upper right icon (Refresh, <<, >> )
Click on these icons to refresh the IGMP Group Status manually or go to the
for next/up page or entry.
3-6 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: A application such as 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 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.