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Catalyst 6500 Series Switch Software Configuration Guide—Release 8.7
OL-8978-02
Chapter 55 Configuring a VoIP Network
Configuring VoIP on a Switch
The default setting is none. Table 55-6 lists the set port auxiliaryvlan command keywords and their
descriptions.
Verifying the Auxiliary VLAN Configuration
To verify the auxiliary VLAN configuration status, perform this task in privileged mode:
This example shows how to verify the auxiliary VLAN configuration status:
Console> show port auxiliaryvlan 123
AuxiliaryVlan AuxVlanStatus Mod/Ports
------------- ------------- -------------------------
222 active 1/2,2/1-3
Console>
Disabling the Auxiliary VLANs Until an IP Phone is Detected
With software release 8.3(1) and later releases, this feature provides security for the auxiliary VLANs
by ensuring that the auxiliary VLAN is not enabled until an IP phone is detected. As soon the switch
detects the presence of an IP phone, the auxiliary VLAN is enabled.
The presence of an IP phone is determined through the CDP packet exchange between the switch and
the phone. This detection method is used for both the inline-powered and wall-powered IP phones.
Note If the auxiliary VLAN ID equals the port-VLAN ID or when the auxiliary VLAN ID is configured as none,
dot1p, or untagged, this feature cannot be applied to the port. If any command entry results in the auxiliary
VLAN ID equaling the port-VLAN ID, the feature is disabled and the following warning message is
displayed: “cdpverify feature on port <mod>/<port> is disabled.”
To enable or disable the auxiliary VLAN IP phone detection, perform this task in privileged mode (the
default is disabled):
Table 55-6 Keyword Descriptions
Keyword Action
dot1p Specify that the phone sends the packets with 802.1p priority 5.
untagged Specify that the phone sends the untagged packets.
none Specify that the switch does not send any auxiliary VLAN information in the
CDP packets from that port.
Task Command
Verify the auxiliary VLAN configuration status. show port auxiliaryvlan {vlan | untagged |
dot1p | none}
Task Command
Enable or disable the auxiliary VLAN IP phone
detection.
set port auxiliaryvlan mod[/port] {vlan | untagged
| dot1p | none} [cdpverify {enable | disable}]
