Configuring Protocol Vlans With Dynamic Ports; Aging Of Dynamic Ports - Foundry Networks Switch and Router Installation And Configuration Manual

BigIron(config-vif-4)# appletalk zone-name DD
BigIron(config-vif-4)# appletalk routing
BigIron(config-vif-4)# write memory

Configuring Protocol VLANs With Dynamic Ports

The configuration examples for protocol VLANs in the sections above show how to configure the VLANs using
static ports. You also can configure the following types of protocol VLANs with dynamic ports:
• AppleTalk protocol
• IP protocol
• IPX protocol
• IP sub-net
• IPX network
NOTE: The software does not support dynamically adding ports to AppleTalk cable VLANs. Conceptually, an
AppleTalk cable VLAN comprises a single network cable, connected to a single port. Therefore, dynamic addition
and removal of ports is not applicable.
NOTE: This feature applies only to Chassis Layer 3 Switches and the TurboIron/8.
NOTE: You cannot route to or from protocol VLANs with dynamically added ports.

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 sub-net 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 sub-net or IPX network,
the aging timer starts over.
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.
Configuration Guidelines
• You cannot dynamically add a port to a protocol VLAN if the port has any routing configuration parameters.
For example, the port cannot have a virtual interface, IP sub-net address, IPX network address, or AppleTalk
network address configured on it.
• Once you dynamically add a port to a protocol VLAN, you cannot configure routing parameters on the port.
• Dynamic VLAN ports are not required or supported on AppleTalk cable VLANs.
Configuring an IP, IPX, or AppleTalk Protocol VLAN with Dynamic Ports
To configure an IP, IPX, or AppleTalk protocol VLAN with dynamic ports, use one of the following methods.
USING THE CLI
To configure port-based VLAN 10, then configure an IP protocol VLAN within the port-based VLAN with dynamic
ports, enter the following commands such as the following:
December 2000
Configuring Virtual LANs (VLANs)
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