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Catalyst 2950 and Catalyst 2955 Switch Command Reference
0L-10102-01
Chapter 2 Catalyst 2950 and 2955 Cisco IOS Commands
switchport access
switchport access
Use the switchport access interface configuration command to configure a port as a static-access or
dynamic-access port. If the mode is set to access, the port operates as a member of the configured VLAN.
If set to dynamic, the port starts discovery of its VLAN assignment based on the incoming packets it
receives. Use the no form of this command to reset the access mode to the default VLAN for the switch.
switchport access vlan {vlan-id | dynamic}
no switchport access
Syntax Description
Defaults All ports are in static-access mode in VLAN 1 if the port is not connected to a device running Dynamic
Trunking Protocol (DTP). The default access VLAN for an access port is VLAN 1.
All ports are dynamic trunk ports.
A dynamic-access port is initially a member of no VLAN and receives its assignment based on the packet
it receives.
Command Modes Interface configuration
Command History
Usage Guidelines The no switchport access command resets the access mode VLAN to the appropriate default VLAN for
the device.
The port must be in access mode before the switchport access vlan command can take effect. For more
information, see the switchport mode command.
An access port can be assigned to only one VLAN.
The VMPS server (such as a Catalyst 6000 series switch) must be configured before a port is configured
as dynamic.
These restrictions apply to dynamic-access ports:
access vlan
vlan-id
Configure the interface as a static-access port. The range is 1 to 4094.
access vlan
dynamic
Specify that the access mode VLAN is dependent on the VLAN Membership
Policy Server (VMPS) protocol. The port is assigned to a VLAN based on the
source MAC address of a host (or hosts) connected to the port. The switch sends
every new MAC address received to the VMPS server to obtain the VLAN name
to which the dynamic-access port should be assigned. If the port already has a
VLAN assigned and the source has already been approved by the VMPS, the
switch forwards the packet to the VLAN.
Release Modification
12.0(5.2)WC(1) This command was introduced.
12.1(6)EA2 The dynamic keyword was added.
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