Understanding Mobile Port Properties; What Is A Configured Default Vlan; What Is A Secondary Vlan - Alcatel OmniSwitch 6624 Network Configuration Manual

Assigning Ports to VLANs

Understanding Mobile Port Properties

Dynamic assignment of mobile ports occurs without user intervention when mobile port traffic matches
VLAN criteria. When ports are dynamically assigned, however, the following configurable mobile port
properties affect how a port uses its configured default VLAN and how long it retains a VLAN port associ-
ation (VPA):
Mobile Port Property If enabled
Default VLAN
Restore default VLAN Port does not retain a dynamic VPA when
The effects of enabling or disabling mobile port properties are described through the following diagrams:
How Mobile Port Traffic that Does Not Match any VLAN Rules is Classified on
•
How Mobile Port VLAN Assignments Age on
•

What is a Configured Default VLAN?

Every switch port, mobile or non-mobile, has a configured default VLAN. Initially, this is VLAN 1 for all
ports, but is configurable using the
Assigning Ports to VLANs" on page
To view current VPA information for the switch, use the
VLAN associations are identified with a value of default in the type field. For more information, see
"Verifying VLAN Port Associations and Mobile Port Properties" on page

What is a Secondary VLAN?

All mobile ports start out with a configured default VLAN assignment. When mobile port traffic matches
VLAN criteria, the port is assigned to that VLAN. Secondary VLANs are any VLAN a port is subse-
quently assigned to that is not the configured default VLAN for that port.
A mobile port can obtain more than one secondary VLAN assignment under the following conditions:
Mobile port receives 802.1Q packets that contain a VLAN ID that matches a VLAN that has VLAN
•
mobile tagging enabled. For example, if a mobile port receives packets tagged for VLAN 10, 20 and 30
and these VLANs have mobile tagging enabled, the mobile port is dynamically assigned to all three
VLANs. VLAN 10, 20, and 30 are now all secondary VLAN assignments for this mobile port.
Mobile port receives IP and IPX protocol packets and one VLAN has an IP protocol rule and another
•
VLAN has an IPX protocol rule. The mobile port is dynamically assigned to both VLANs, which are
now considered secondary VLANs for that port.
OmniSwitch 6624/6648 Network Configuration Guide
Port traffic that does not match any VLAN
rules configured on the switch is flooded
on the port's configured default VLAN
until the port is dynamically assigned to
another VLAN. Then this traffic is filtered
on the new VLAN.
the traffic that triggered the assignment
ages out of the switch MAC address table
(forwarding database).
vlan port default
6-4.
Understanding Mobile Port Properties
If disabled
Port traffic that does not match any
VLAN rules is discarded until the
port is dynamically assigned to
another VLAN. Then this traffic is
filtered on the new VLAN.
Port retains a dynamic VPA when
the qualifying traffic ages out of the
switch MAC address table.
page 6-15.
command. For more information, see
show vlan port command. Configured default
6-19.
April 2004
page 6-14.
"Statically
page 6-13