Allied Telesis AlliedWare Plus Operating System Version 5.4.4C (x310-26FT,x310-26FP,x310-50FT,x310-50FP) - Manual (Page 351)

Switching Introduction
Software Reference for x310 Series Switches
C613-50046-01 REV A AlliedWare Plus TM Operating System - Version 5.4.4C 14.9
To set the mac address-table ageing-time to 1000 seconds:
To display general switch settings, including settings for switch learning and the switch
ageing timer, use the
show system command on page 8.46 .
The Forwarding Process
After a VID is assigned to a frame using the ingress rules, the switch forwards it to the
destination MAC address specified in the frame. To do this the switch must learn which
MAC addresses are available on each port for each VLAN. When the destination MAC
address is not found, the switch floods the frame on all ports that are members of the
VLAN except the port on which the frame was received.
The forwarding database (also known as the MAC Address table) determines the egress
port on which the destination MAC address has been learned. MAC addresses are learned
dynamically as part of the Layer 2 switching process.
The forwarding database is ordered according to MAC address and VLAN identifier. This
means a MAC address can appear more than once in the forwarding database having
been learned on the same port but for different VLANs. This could occur if the IP address of
an end station is changed thereby moving the end station to a different IP subnet-based
VLAN while still connected to the same switch port. When the forwarding database
ageing process is enabled, old entries in the forwarding database are deleted after a
user-configurable period.
If the destination address is found, the switch discards the frame when the port is not in
the STP forwarding or disabled state if the destination address is on the same port as the
source address, or if there is a static filter entry for the destination address set to discard
(see
“Layer 2 Filtering” on page 14.11 ). Otherwise, the frame is forwarded on the
indicated port.
Forwarding occurs only when the port on which the frame was received is in the Spanning
Tree forwarding or disabled state. The destination address is then looked up in the
forwarding database for the VLAN.
The Egress Rules
After the forwarding process has determined from which ports and transmission queues
to forward a frame, the egress rules for each port determine whether the outgoing frame
is VLAN-tagged with its numerical VLAN identifier (VID).
A port must belong to a VLAN at all times unless the port has been set as the mirror port
for the switch.
awplus#
configure terminal Enter the config terminal mode
awplus(config)#
mac address-table ageing-time 1000 Set the ageing time to 1000
seconds