D-Link DES-3350SR Reference Manual - Page 119

DES-3350SR Layer 3 Fast Ethernet Switch User's Guide MAC Address : 01-00-5E-00-00-00 Egress Ports : 1-5, 26 Mode : Static Total Entries : 1 local> config fdb aging_time Purpose Used to set the aging time of the forwarding database. Syntax config fdb aging_time 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 1,000,000 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 A very long aging time can result in dynamic forwarding table entries that are out-of-date or no longer exist.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. 119