Cisco WS-C2960-24PC-L Software Guide - Page 267
Configuration Guidelines, Configuring Dynamic Port VLAN Membership with Auxiliary VLANs
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Chapter 12 Configuring Dynamic VLAN Membership with VMPS Dynamic Port VLAN Membership with Auxiliary VLANs 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: • 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) Configuration Guidelines This section lists the guidelines for configuring dynamic port VLAN membership for auxiliary VLANs: • Read the "Configuration Guidelines for Dynamic Ports and VMPS" section on page 12-3 before you 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 "VMPS Example" section on page 12-12 for 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. 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 active 5/9 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 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 12-15