cdp mode pre-standard-voice

Syntax 

[no] cdp mode pre-standard-voice [admin-status <PORT-LIST> [tx_rx | rxonly]]

Description

Enable CDP-compatible voice VLAN discovery with pre-standard VoIP phones. In this mode, when a CDP VoIP VLAN query is received on a port from pre-standard phones, the switch replies back with a CDP packet that contains the VID of the voice VLAN associated with that port.

Not recommended for phones that support LLDP-MED.

Parameters and options

pre-standard-voice

Enables CDP-compatible voice VLAN discovery with pre-standard VoIP phones.

admin-status

Sets the port in either transmit and receive mode, or receive mode only.

Default: tx-rx.

<PORT-LIST>

Sets this port in transmit and receive mode, or receive mode only.

rxonly

Enable receive-only mode of CDP processing.

tx_rx

Enable transmit and receive mode.

cdp mode pre-standard-voice

Switch# cdp mode pre-standard-voice admin-status A5 rxonly

show cdp without cdp run

Show CDP output when CDP Run is disabled. 
Switch(config)# show cdp
Global CDP information
Enable CDP [yes] : no

show cdp with cdp run and sdp

show cdp output when cdp run and sdp mode are enabled. 

Switch# show cdp
Global CDP Information
Enable CDP [Yes] : Yes
CDP mode [rxonly] : pre-standard-voice
CDP Hold Time [180] : 180
CDP Transmit Interval [60] : 60
Port CDP admin-status
---- --------- ------------
A1   enabled   rxonly
A2   enabled   tx_rx
A3   enabled   tx_rx

show cdp with cdp run and cdp mode rxonly

show cdp output when cdp run and cdp mode rxonly are enabled. When CDP mode is not pre-standard voice, the admin-status column is note displayed. 

switch# show cdp
Global CDP Information
Enable CDP [Yes} : Yes
CDP mode [rxonly] : rxonly
Port CDP
---- --------
A1   enabled
A2   enabled
A3   enabled

show running-config

show running-config when admin-status is configured. 

switch# show running-config
Running configuration:
; J9477A Configuration Editor; Created on release #K.16.09.0000x
; Ver #03:01:1f:ef:f2
hostname “Switch”
module 1 type J9307A
cdp mode pre-standard-voice admin-status A5 RxOnly