• VOIP VLAN Reply (type 0xe): voice VLAN ID (same as advertised by LLDPMED)
• Trust Bitmap (type 0x12): 0x00
• Untrusted port COS (type 0x13): 0x00
CDP should be enabled and running on the interfaces to which the phones are connected. Use the cdp enable
and cdp run commands.
The pre-standard-voice option for the cdp mode command allows the configuration of CDP mode so that it
responds to received CDP queries from a VoIP phone.
Syntax:
[no] cdp mode pre-standard-voice [admin-status < port-list > [tx_rx | rxonly]]
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.
NOTE: Not recommended for phones that support LLDP-MED.
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.
switch(config)# cdp mode pre-standard-voice admin-status A5 rxonly
The show cdp output when CDP Run is disabled
switch(config)# show cdp
Global CDP information
Enable CDP [yes] : no
The show cdp output when cdp run and sdp mode are enabled
switch(config)# 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
252 Aruba 2930F / 2930M Management and Configuration Guide
for ArubaOS-Switch 16.08
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