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PowerConnect B-Series FCX Configuration Guide 465
53-1002266-01
Configuring protocol VLANs with dynamic ports
13
Aging of dynamic ports
When you add the ports to the VLAN, the software automatically adds them all to the VLAN.
However, dynamically added ports age out. If the age time for a dynamic port expires, the software
removes the port from the VLAN. If that port receives traffic for the IP subnet or IPX network, the
software adds the port to the VLAN again and starts the aging timer over. Each time the port
receives traffic for the VLAN's IP subnet or IPX network, the aging timer starts over.
NOTE
You can disable VLAN membership aging of dynamically added ports. Refer to “Disabling
membership aging of dynamic VLAN ports” on page 465).
Dynamic ports within any protocol VLAN age out after 10 minutes, if no member protocol traffic is
received on a port within the VLAN. The aged out port, however, remains as a candidate dynamic
port for that VLAN. The port becomes active in the VLAN again if member protocol traffic is received
on that port.
Once a port is re-activated, the aging out period for the port is reset to 20 minutes. Each time a
member protocol packet is received by a candidate dynamic port (aged out port) the port becomes
active again and the aging out period is reset for 20 minutes.
Disabling membership aging of dynamic VLAN ports
You can disable VLAN membership aging of ports that are dynamically assigned to protocol or
subnet-based VLANs. This feature resolves the connectivity issue that may occur in certain
configurations when protocol or subnet VLANs are configured with dynamic port membership.
NOTE
This issue does not occur with statically assigned VLAN memberships. Thus, enable this feature only
if your configuration includes dynamically assigned VLAN memberships for protocol or subnet
VLANs.
To enable this feature, enter commands such as the following.
PowerConnect(config)# vlan 10 by port
PowerConnect(config-vlan-10)# interface ethernet 1/1 to 1/5
PowerConnect(config-vlan-10)# ip-proto name IP_Prot_VLAN
PowerConnect(config-vlan-ip-proto)# no-dynamic-aging
PowerConnect(config-vlan-ip-proto)# write memory
These commands create an IP protocol VLAN and disable the VLAN membership aging of ports that
are dynamically assigned to the protocol VLAN.
Syntax: [no] no-dynamic-aging
Enter the no form of the command to disable this feature after it has been enabled.
By default, VLAN membership of dynamically assigned ports will age out after a period of time if no
packets belonging to that protocol or subnet VLAN are received by the CPU.
The output of the show running-config command indicates if the no-dynamic-aging feature is
enabled for a specific protocol or subnet VLAN.