Vlan Port Membership Modes - Cisco Catalyst 3550 series Software Configuration Manual

Chapter 12 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 12-1 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
Trunk (ISL or A trunk port is a member of all VLANs by default,
IEEE 802.1Q) 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 normal-range
VLAN (VLAN ID 1 to 1005) and is dynamically assigned
by a VMPS. The VMPS can be a Catalyst 5000 or
Catalyst 6000 series switch, for example, but never a
Catalyst 3550 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
Tunnel Tunnel ports are used for 802.1Q tunneling to maintain
(dot1q-tunnel) customer VLAN integrity across a service provider
network. You configure a tunnel port on an edge switch in
the service provider network and connect it to an 802.1Q
trunk port on a customer interface, creating an asymmetric
link. A tunnel port belongs to a single VLAN that is
dedicated to tunneling.
For more information about tunnel ports, see
"Configuring 802.1Q and Layer 2 Protocol Tunneling."
78-11194-09
"Assigning Static-Access Ports to a VLAN"
12-11.
12-19.
12-32.
Chapter 14, "Configuring Voice VLAN."
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.
VTP is not required. You manually assign
the tunnel port to a VLAN by using the
switchport access vlan interface
configuration command.
Chapter 15,
Catalyst 3550 Multilayer Switch Software Configuration Guide
Understanding VLANs
Table 12-1 lists the membership
12-3