Configuring Auxiliary Vlans; Understanding Auxiliary Vlans - Cisco WS-C2948G-GE-TX Configuration Manual

Chapter 10 Configuring VLANs
When you delete a VLAN, any ports that are assigned to that VLAN become inactive. Such ports remain
Caution
associated with the VLAN (and thus, inactive) until you assign them to a new VLAN.
To delete a VLAN on the switch, perform this task in privileged mode:
Task
Delete a VLAN.
This example shows how to delete a VLAN (in this case, the switch is a VTP server):
Console> (enable) clear vlan 500
This command will deactivate all ports on vlan 500
in the entire management domain
Do you want to continue (y/n) [n]?y
Vlan 500 deleted
Console> (enable)

Configuring Auxiliary VLANs

The following sections describe how to configure auxiliary VLANs to use with IP phones.

Understanding Auxiliary VLANs

An IP phone contains an integrated three-port 10/100 switch. The ports, which are dedicated
connections, are described as follows:
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•
•
Figure 10-2
When the IP phone connects to a 10/100 port on the Catalyst 4500 series switch, the access port
(PC-to-phone jack) of the IP phone can be used to connect a PC.
Packets to and from the PC and to and from the phone share the same physical link to the switch and the
same port of the switch.
Introducing IP-based phones into existing switch-based networks raises the following issues:
•
•
Catalyst 4500 Series, Catalyst 2948G, Catalyst 2948G-GE-TX, and Catalyst 2980G Switches Software Configuration Guide—Release 8.2GLX
78-15908-01
Port 1 connects to the Catalyst 4500 series switch or other device that supports Voice-over-IP (VoIP).
Port 2 is an internal 10/100 interface that carries the phone traffic.
Port 3 connects to a PC or other device.
shows how you can connect a Cisco IP Phone to a Catalyst 4500 series switch.
The current VLANs might be configured on an IP subnet basis, and additional IP addresses might
not be available to assign the phone to a port so that it belongs to the same subnet as other devices
(PC) that are connected to the same port.
Data traffic present on the VLAN supporting phones might reduce the quality of VoIP traffic.
Configuring Auxiliary VLANs
Command
clear vlan vlan_num
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