Alcatel-Lucent 6850-48 Guida Di Rete

Dynamically Assigning Ports to VLANs

Assigning Ports to VLANs

page 6-8

OmniSwitch AOS Release 6 Network Configuration Guide

VLAN rule classification triggers dynamic VLAN port assignment when traffic received on a mobile port 
matches the criteria defined in a VLAN rule. Different rule types are available for classifying different 
types of network device traffic (see 

 for more information). 

Note the following items when using VLAN rule classification:

• IP network address rules are applied to traffic received on both mobile and fixed ports. If traffic 

contains a source IP address that is included in the subnet specified by the rule, the traffic is dropped. 
This does not occur, however, if the IP network address rule is configured on the default VLAN for the 
fixed port.

• If the contents of a mobile port frame matches the values specified in both an IP network address rule 

and a port-protocol binding rule, the IP network address rule takes precedence. However, if the 
contents of such frame violates the port-protocol binding rule, the frame is dropped. See 

 for more information about rule precedence.

• When an active device is disconnected from a mobile port and connected to a fixed port, the source 

MAC address of that device is not learned on the fixed port until the MAC address has aged out and no 
longer appears on the mobile port.

• If a VLAN is administratively disabled, dynamic mobile port assignments are retained but traffic on 

these ports is filtered for the disabled VLAN. However, VLAN rules remain active and continue to 
classify mobile port traffic for VLAN membership.

• When a VLAN is deleted from the switch configuration, all rules defined for that VLAN are automati-

cally removed and any static or dynamic port assignments are dropped.

The following example illustrates how mobile ports are dynamically assigned using VLAN rules to clas-
sify mobile port traffic. This example includes diagrams showing the initial VLAN port assignment 
configuration and a diagram showing how the configuration looks after mobile port traffic is classified.

In the initial VLAN port assignment configuration shown on 

• All three ports have workstations that belong to three different IP subnets (130.0.0.0, 138.0.0.0, and 

140.0.0.0). 

• Mobility is enabled on each of the workstation ports.

• VLAN 1 is the configured default VLAN for each port. 

• Three additional VLANs are configured on the switch, each one has an IP network address rule defined 

for one of the IP subnets.