Configuration Guidelines; Configuring Dynamic Port Vlan Membership With Auxiliary Vlans - Cisco WS-C2950SX-48-SI Configuration Manual

Chapter 12 Configuring Dynamic VLAN Membership with VMPS
With software release 6.2(1) and later releases, the dynamic ports can belong to two VLANs. The switch
port configured for connecting an IP phone can have separate VLANs configured for carrying the
following:
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Configuration Guidelines

This section lists the guidelines for configuring dynamic port VLAN membership for auxiliary VLANs:
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Configuring Dynamic Port VLAN Membership with Auxiliary VLANs

This example shows how to add voice ports to auxiliary VLANs and specify an encapsulation type:
Console> (enable) set port auxiliaryvlan 5/9 222
Auxiliaryvlan 222 configuration successful.
AuxiliaryVlan AuxVlanStatus Mod/Ports
------------- ------------- -------------------------
222
Console> (enable)
Console> (enable) set port auxiliaryvlan 5/9 untagged
Port 2/48 allows the connected device send and receive untagged packets and without 802.1p
priority.
Console> (enable)
This example shows how to specify port 5/9 as a dynamic port:
Console> (enable) set port membership 5/9 dynamic
Warning: Auxiliary Vlan set to dot1p|untagged on dynamic port. VMPS will be queried for IP
phones.
Port 5/9 vlan assignment set to dynamic.
Spantree port fast start option enabled for ports 5/9.
Console> (enable)
This example shows that the auxiliary VLAN ID that is specified cannot be the same as the native VLAN
ID:
78-15486-01
Voice traffic to and from the IP phone (auxiliary VLAN)
Data traffic to and from the PC that is connected to the switch through the access port of the IP
phone (native VLAN)
Read the "Configuration Guidelines for Dynamic Ports and VMPS" section on page 12-3
begin the configuration.
Configuration of the native VLAN ID is dynamic for the PC that is connected to the access port of the
IP phone. Configuration of the auxiliary VLAN ID is not dynamic, you need to configure it manually.
As you manually configure the auxiliary VLAN ID, the VMPS server is queried for packets coming from
the PC, but not for packets coming from the IP phone.
All packets, except CDP packets from the IP phone, are tagged with the auxiliary VLAN ID. All
such tagged packets are considered to be packets from the phone, and all other packets are
considered to be packets from the PC.
When configuring the auxiliary VLAN ID with untagged frames, you need to configure the VMPS
server with the IP phone's MAC address (see the
information on configuring VMPS).
For dynamic ports, the auxiliary VLAN ID cannot be the same as the native VLAN ID that is
assigned by VMPS for the dynamic port.
active
Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide
Dynamic Port VLAN Membership with Auxiliary VLANs
"VMPS Example" section on page 12-12
5/9
before you
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Release 8.1
12-15