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xStack® DES-3528/DES-3552 Series Layer 2 Fast Ethernet Switch CLI Reference Manual
config multicast_fdb
Purpose
Used to configure the Switch’s multicast MAC address forwarding database.
Syntax
config multicast_fdb <vlan_name 32> <macaddr> [add | delete] <portlist>
Description
This command configures the multicast MAC address forwarding table.
Parameters
<vlan_name 32> − The name of the VLAN on which the MAC address resides.
<macaddr> − The MAC address that will be added to the multicast forwarding table.
[add | delete] − add will add ports to the forwarding table. delete will remove ports from the
multicast forwarding table.
<portlist> − Specifies a port or range of ports to be configured.
Restrictions
Only Administrator and Operator-level users can issue this command.
Example usage:
To add multicast MAC forwarding:
DES-3528:5#config multicast_fdb default 01-00-00-00-00-01 add 1-5
Command: config multicast_fdb default 01-00-00-00-00-01 add 1-5
Success.
DES-3528:5#
config fdb aging_time
Purpose
Used to set the aging time of the forwarding database.
Syntax
config fdb aging_time <sec 10-1000000>
Description
The aging time affects the learning process of the Switch. Dynamic forwarding table entries,
which are made up of the source MAC addresses and their associated port numbers, are
deleted from the table if they are not accessed within the aging time. The aging time can be
from 10 to 1000000 seconds with a default value of 300 seconds. A very long aging time can
result in dynamic forwarding table entries that are out-of-date or no longer exist. This may
cause incorrect packet forwarding decisions by the Switch. If the aging time is too short
however, many entries may be aged out too soon. This will result in a high percentage of
received packets whose source addresses cannot be found in the forwarding table, in which
case the Switch will broadcast the packet to all ports, negating many of the benefits of having
a switch.
Parameters
<sec 10-1000000> − The aging time for the MAC address forwarding database value. The
value in seconds may be between 10 and 1000000 seconds.
Restrictions
Only Administrator and Operator-level users can issue this command.
Example usage:
To set the FDB aging time:
DES-3528:5#config fdb aging_time 300
Command: config fdb aging_time 300
Success.
DES-3528:5#
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