H3C Technologies H3C WX5500E Series Access Controllers - Manual (Page 192)

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Step Command Remarks
3. Enter Ethernet interface view
or port group view.
• Enter Layer 2 Ethernet interface
view:
interface interface-type
interface-number
• Enter port group view:
port-group manual
port-group-name
Use either command.
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.
Enabling LLDP to automatically discover IP phones
In a traditional voice VLAN network, the switch maps the source MAC addresses of IP phones to a limited
number of OUI addresses to allow them to access the network. This method restricts the types of IP
phones on the network, if the IP phones with the source MAC addresses match the same OUI address are
categorized as a type.
To break the restriction, you can enable the switch to automatically discover IP phones through LLDP. With
this function, the switch can automatically discover the peer, and exchange LLDP TLVs with the peer. If the
LLDP System Capabilities TLV received on a port shows that the peer is phone capable, the switch
determines that the peer is an IP phone and sends an LLDP TLV carrying the voice VLAN configuration to
the peer.
When the IP phone discovery process is complete, the port will automatically join the voice VLAN and
improve the transmission priority of the voice traffic for the IP phone. To ensure that the IP phone can pass
authentication, the switch will add the MAC address of the IP phone to the MAC address table.
For more information about voice VLANs, see "Configuring voice VLANs."
Configuration prerequisites
Before you enable the switch to automatically discover IP phones through LLDP, complete the following
tasks:
• Enable LLDP globally and on ports.
• Configure voice VLANs.
Configuration procedure
Step Command Remarks
1. Enter system view. system-view N/A
2. Enable LLDP to automatically
discover IP phones.
voice vlan track lldp Disabled by default.