Vlan Port Membership Modes - Cisco Catalyst 2975 Software Configuration Manual

Chapter 13 Configuring VLANs

VLAN Port Membership Modes

You configure a port to belong to a VLAN by assigning a membership mode that specifies the kind of
traffic the port carries and the number of VLANs to which it can belong.
modes and membership and VTP characteristics.
Table 13-1 Port Membership Modes and Characteristics
Membership Mode
Static-access
Trunk (IEEE 802.1Q)
Dynamic access
Voice VLAN
For more detailed definitions of access and trunk modes and their functions, see
page
OL-19720-02
VLAN Membership Characteristics
A static-access port can belong to one VLAN and is
manually assigned to that VLAN.
For more information, see the
Static-Access Ports to a VLAN" section on
page 13-9.
A trunk port is a member of all VLANs by default,
including extended-range VLANs, but membership
can be limited by configuring the allowed-VLAN list.
You can also modify the pruning-eligible list to block
flooded traffic to VLANs on trunk ports that are
included in the list.
For information about configuring trunk ports, see
the "Configuring an Ethernet Interface as a Trunk
Port" section on page 13-15.
A dynamic-access port can belong to one VLAN
(VLAN ID 1 to 4094) and is dynamically assigned by
a VMPS. The VMPS can be a Catalyst 5000 or
Catalyst 6500 series switch, for example, but never a
Catalyst 2975 switch. The Catalyst 2975 switch is a
VMPS client.
You can have dynamic-access ports and trunk ports
on the same switch, but you must connect the
dynamic-access port to an end station or hub and not
to another switch.
For configuration information, see the
Dynamic-Access Ports on VMPS Clients" section on
page 13-26.
A voice VLAN port is an access port attached to a
Cisco IP Phone, configured to use one VLAN for
voice traffic and another VLAN for data traffic from
a device attached to the phone.
For more information about voice VLAN ports, see
Chapter 14, "Configuring Voice VLAN."
13-13.
VTP Characteristics
VTP is not required. If you do not want VTP
to globally propagate information, set the
VTP mode to transparent. To participate in
"Assigning
VTP, there must be at least one trunk port on
the switch stack connected to a trunk port of
a second switch or switch stack.
VTP is recommended but not required. 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.
VTP is required.
Configure the VMPS and the client with the
same VTP domain name.
To participate in VTP, at least one trunk port
on the switch stack must be connected to a
trunk port of a second switch or switch
stack.
"Configuring
VTP is not required; it has no effect on a
voice VLAN.
Catalyst 2975 Switch Software Configuration Guide
Understanding VLANs
Table 13-1 lists the membership
Table 13-4 on
13-3