• 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