57
display lldp local-information
For more information about the command, see Layer 2—LAN Switching Command Reference.
Configuring CDP to advertise a voice VLAN
About configuring CDP to advertise a voice VLAN
If an IP phone supports CDP but does not support LLDP, it will send out CDP packets to the device to
request the voice VLAN ID. If the IP phone does not receive the voice VLAN ID within a time period,
it will send out untagged packets. The device cannot differentiate untagged voice packets from other
types of packets.
You can configure CDP compatibility on the device to enable it to perform the following operations:
• Receive and identify CDP packets from the IP phone.
• Send CDP packets to the IP phone. The voice VLAN information is carried in the CDP packets.
After receiving the advertised VLAN information, the IP phone performs automatic voice VLAN
configuration. Packets from the IP phone will be transmitted in the dedicated voice VLAN.
LLDP packets sent from the device carry the priority information. CDP packets sent from the device
do not carry the priority information.
Prerequisites
Before you configure this feature, enable LLDP globally and on access ports.
Procedure
1. Enter system view.
system-view
2. Enable CDP compatibility.
lldp compliance cdp
By default, CDP compatibility is disabled.
3. Enter Layer 2 Ethernet interface view.
interface interface-type interface-number
4. Configure CDP-compatible LLDP to operate in TxRx mode.
lldp compliance admin-status cdp txrx
By default, CDP-compatible LLDP operates in Disable mode.
5. Configure an advertised voice VLAN ID.
cdp voice-vlan vlan-id
By default, no advertised voice VLAN ID is configured.
For more information about the command, see Layer 2—LAN Switching Command Reference.
Display and maintenance commands for voice
VLANs
Execute display commands in any view.
Task Command
Display OUI addresses on a device.
display voice-vlan mac-address
Display the voice VLAN state.
display voice-vlan state
To Next Page
Loading...
Need help?
General