DGS-3312SR Layer 3 Gigabit Switch
84
config multicast_fdb
separated by a dash. For example, 1:3 specifies switch
number 1, port 3. 2:4 specifies switch number 2, port 4. 1:3-
2:4 specifies all of the ports between switch 1, port 3 and
switch 2, port 4
−
in numerical order.
Restrictions Only
administrator-level users can issue this command.
Example usage:
To add multicast MAC forwarding:
DGS-3312SR:4#config multicast_fdb default 01-00-00-00-00-01 add 1:1-1:5
Command: config multicast_fdb default 01-00-00-00-00-01 add 1:1-1:5
Success.
DGS-3312SR:4#
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forwarding table entries that are out-of-date or no longer exist.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. The default is 300 seconds.
Restrictions Only
administrator-level users can issue this command.
Example usage:
To set the fdb aging time:
DGS-3312SR:4#config fdb aging_time 300
Command: config fdb aging_time 300
Success.
DGS-3312SR:4#
