D-Link 3312SR Reference Manual - Page 90

DGS-3312SR Layer 3 Gigabit Switch 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. 1:32:4 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 Syntax Description Parameters Restrictions Used to set the aging time of the forwarding database. config fdb aging_time 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 A very long aging time can result in dynamic forwarding table entries that are out-of-date or no longer exist.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. − 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. 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# 84