Vlan Port Membership Modes - Cisco Catalyst 2950 Software Configuration Manual

Chapter 16 Configuring VLANs

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 to which it can belong.
modes and membership and VTP characteristics.
Table 16-1 Port Membership Modes
Membership Mode VLAN Membership Characteristics
Static-access A static-access port can belong to one VLAN and is
manually assigned to that VLAN. For more information,
see the
section on page
802.1Q trunk 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
Dynamic access 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 2950 or 2955
switch.
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 and not to another switch.
For configuration information, see the
Dynamic Access Ports on VMPS Clients" section on
page
Voice VLAN 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
For more detailed definitions of the modes and their functions, see
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
78-11380-12
"Assigning Static-Access Ports to a VLAN"
16-11.
16-17.
16-28.
Chapter 18, "Configuring Voice VLAN."
7-19.
VTP Characteristics
VTP is not required. If you do not want
VTP to globally propagate information, set
the VTP mode to transparent to disable
VTP. To participate in VTP, there must be
at least one trunk port on the switch
connected to a trunk port of a second
switch.
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.
You can change the reconfirmation interval
and retry count on the VMPS client switch.
"Configuring
VTP is not required; it has no affect on
voice VLAN.
"Managing the MAC Address Table" section on
Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide
Understanding VLANs
Table 16-1 lists the membership
Table 16-4 on page 16-16.
16-3