Alcatel 9000 Guia do Utilizador descarregar pdf (Página 162)

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Understanding Mobile Port Properties Assigning Ports to VLANs

page 7-12 OmniSwitch 6800/6850/9000 Network Configuration Guide June 2006

When BPDU ignore is enabled and the mobile port receives a BPDU, the following occurs:

• The port retains its mobile status and remains eligible for dynamic VLAN assignment.

• The port is not included in the Spanning Tree algorithm.

Note. Enabling BPDU ignore is not recommended. In specific cases where it is required, such as connect-

ing legacy networks to mobile port networks, make sure that ignoring BPDU on a mobile port will not

cause network loops to go undetected. Connectivity problems could also result if a mobile BPDU port

dynamically moves out of its configured default VLAN where it provides traffic flow to/from the network.

The following command enables mobility and BPDU ignore on port 8 of slot 3:

-> vlan port mobile 3/8 BPDU ignore enable

Enabling mobility on an active port that sends or receives BPDU (e.g. ports that connect two switches and

Spanning Tree is enabled on both the ports and their assigned VLANs) is not allowed. If mobility is

required on this type of port, enable mobility and the BPDU ignore parameter when the port is not active.

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):

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 page 7-14.

• How Mobile Port VLAN Assignments Age on page 7-15.

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 vlan port default command. For more information, see “Statically

Assigning Ports to VLANs” on page 7-4.

To view current VPA information for the switch, use the show vlan port command. Configured default

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 7-19.

Mobile Port Property If enabled If disabled

Default VLAN Port traffic that does not match any VLAN

rules configured on the switch is flooded

on the port’s configured default VLAN.

Port traffic that does not match any

VLAN rules is discarded.

Restore default VLAN Port does not retain a dynamic VPA when

the traffic that triggered the assignment

ages out of the switch MAC address table

(forwarding database).

Port retains a dynamic VPA when

the qualifying traffic ages out of the

switch MAC address table.

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