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Chapter 8
Configuring VLANs
Assigning VLAN Port Membership Modes
You configure a port to belong to a VLAN by assigning a membership mode that determines the kind of
traffic the port carries and the number of VLANs it can belong to.
and characteristics.
Table 8-2
Port Membership Modes
Membership Mode VLAN Membership Characteristics
Static-access
A static-access port can belong to one VLAN and is manually assigned. By default, all ports are
static-access ports assigned to VLAN 1.
Multi-VLAN
A multi-VLAN port can belong to up to 250 VLANs (some models only support 64 VLANs) and is
manually assigned. You cannot configure a multi-VLAN port when a trunk is configured on the switch.
VLAN traffic on the multi-VLAN port is not encapsulated.
Trunk (ISL, ATM,
A trunk is a member of all VLANs in the VLAN database by default, but membership can be limited by
or
configuring the allowed-VLAN list. You can also modify the pruning-eligible list to block flooded traffic
IEEE 802.1Q)
to VLANs on trunk ports that are included in the list.
VLAN Trunking Protocol (VTP) maintains VLAN configuration consistency by managing the addition,
deletion, and renaming of VLANs on a network-wide basis. VTP exchanges VLAN configuration
messages with other switches over trunk links.
Note
Dynamic access
A dynamic-access port can belong to one VLAN and is dynamically assigned by a VLAN Membership
Policy Server (VMPS). The VMPS can be a Catalyst 5000 series switch but never a Catalyst 2900 XL
or Catalyst 3500 XL switch.
When a port belongs to a VLAN, the switch learns and manages the addresses associated with the port
on a per-VLAN basis. For more information, see the
page
78-6511-08
By using the Asynchronous Transfer Mode (ATM) module CLI, you can map the LAN emulation
(LANE) client to a VLAN or bind one or more permanent virtual connections (PVCs) to a
VLAN. The VLAN ID is then displayed in the Assigned VLANs column of the VLAN
Membership window. An ATM port can only be a trunk port. For more information, refer to the
Catalyst 2900 Series XL ATM Modules Installation and Configuration Guide.
6-15.
Catalyst 2900 Series XL and Catalyst 3500 Series XL Software Configuration Guide
Assigning VLAN Port Membership Modes
Table 8-2
lists the membership modes
"Managing the MAC Address Tables" section on
8-5
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Troubleshooting
