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GS700TR Smart Switch Software Administration Manual
3-36 Configuring Switching Information
v1.0, May, 2008
2. Click Cancel to cancel the configuration on the screen and reset the data on the screen to the
latest value of the switch.
3. If you make any configuration changes, click Apply to apply the new settings to the switch.
Configuration changes take effect immediately.
Viewing Multicast Forwarding Database Information
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, then the
packet is either flooded to all ports in the VLAN or discarded, depending on the switch
configuration. If a match is found, then the packet is forwarded only to the ports that are members
of that multicast group.
The Switching > Multicast folder contains links to the following pages:
Host TImeout Specify the amount of time you want the switch to wait for a report for a
particular group on a particular interface before it deletes that interface
from the group. Enter a value between 1 and 3600 seconds. The
default is 260 seconds.
Max Response Time Specify the amount of time you want the switch to wait after sending a
query on an interface because it did not receive a report for a particular
group on that interface. Enter a value greater or equal to 1 and less
than the Group Membership Interval in seconds. The default is 10
seconds. The configured value must be less than the Group
Membership Interval.
MRouter Timeout Specify the amount of time you want the switch to wait to receive a
query on an interface before removing it from the list of interfaces with
multicast routers attached. Enter a value between 0 and 3600 seconds.
The default is 0 seconds. A value of zero indicates an infinite timeout;
i.e., no expiration.
Fast Leave Admin Mode Select the Fast Leave mode for a particular interface from the menu.
The default is Disable.
Table 3-23. IGMP Snooping Interface Configuration Fields (continued)
Field Description