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4.4.12
Multicast Forwarding Database
The Layer 2 Multicast Forwarding Database (MFDB) is used by the switch to make
forwarding decisions for packets that arrive with a multicast destination MAC
address. By limiting multicasts to only certain ports in the switch, traffic is prevented
from going to parts of the network where that traffic is unnecessary.
When a packet enters the switch, the destination MAC address is combined with the
VLAN ID and a search is performed in the Layer 2 Multicast Forwarding Database. If
no match is found, the packet is either flooded to all ports in the VLAN or discarded,
depending on the switch configuration. If a match is found, the packet is forwarded
only to the ports that are members of that multicast group.
4.4.12.1
Summary
The Multicast Forwarding Database Summary page displays the entries in the multi-
cast forwarding database (MFDB) on the device. The MFDB holds the port member-
ship information for all active multicast address entries and is used to make
forwarding decisions for frames that arrive with a multicast destination MAC address.
The key for an entry consists of a VLAN ID and MAC address pair. Entries may con-
tain data for more than one protocol.
To access this page, click Switching > Multicast Forwarding Database > Sum-
mary.
Figure 4.216 Switching > Multicast Forwarding Database > Summary
Description
The operational state of the MLD Snooping Querier on a VLAN, which
is one of the following:
Querier: The snooping switch is the querier in the VLAN. The
snooping switch will send out periodic queries with a time interval
equal to the configured querier query interval. If the snooping
switch sees a better querier (numerically lower) in the VLAN, it
moves to non-querier mode.
Non-Querier: The snooping switch is in non-querier mode in the
VLAN. If the querier expiry interval timer expires, the snooping
switch moves into querier mode.
Disabled: The snooping querier is not operational on the VLAN.
The snooping querier moves to the disabled mode when MLD
snooping is not operational on the VLAN, when the querier
address is not configured, or the network management address
is not configured.
The operational MLD protocol version of the querier.
The IPv6 address of the last querier from which a query was snooped
on the VLAN.
The MLD protocol version of the last querier from which a query was
snooped on the VLAN.
The maximum response time to be used in the queries that are sent by
the snooping querier.
Click Refresh to update the screen.
197
EKI-9500 Series User Manual
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