H3C Technologies H3C S7500E Series Switches - Manual (Page 323)

22-13
the voice VLAN configuration TLVs, the IP phone automatically configures the voice VLAN. Thus, the
voice traffic is confined in the configured voice VLAN, and differentiated from other types of traffic.
Configuration Prerequisites
Before configuring CDP compatibility, make sure that:
LLDP is enabled globally.
LLDP is enabled on the port connected to an IP phone and is configured to operate in TxRx mode
on the port.
Configuring CDP Compatibility
CDP-compatible LLDP operates in one of the follows modes:
TxRx: The CDP packets can be transmitted and received.
Disable: The CDP packets can neither be transmitted nor be received.
To make CDP-compatible LLDP take effect on certain ports, first enable CDP-compatible LLDP
globally, and then configure CDP-compatible LLDP to operate in TxRx mode.
Follow these steps to enable LLDP to be compatible with CDP:
To do… Use the command… Remarks
Enter system view system-view —
Enable CDP compatibility globally lldp compliance cdp
Required
Disabled by default.
Enter Ethernet
port view
interface interface-type
interface-number
Enter Ethernet
port view or port
group view
Enter port
group view
port-group manual
port-group-name
Required
Use either command
Configure CDP-compatible LLDP
to operate in TxRx mode
lldp compliance admin-status
cdp txrx
Required
By default, CDP-compatible LLDP
operates in disable mode.
The maximum TTL value allowed by CDP is 255 seconds. To make CDP-compatible LLDP work
properly with Cisco IP phones, make sure that the product of the TTL multiplier and the LLDPDU
transmit interval is less than 255 seconds.