H3C Technologies H3C S12500 Series Switches - Manual (Page 240)

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Step Command Remarks
1. Enter system view. system-view N/A
2. Enter Ethernet interface view or
port group view.
• Enter Layer 2 or Layer 3 Ethernet
interface view:
interface interface-type
interface-number
• Enter port group view:
port-group manual port-group-name
Use either command.
3. Configure the encapsulation
format for LLDP frames as SNAP. lldp encapsulation snap
Ethernet II encapsulation
format applies by default.
Configuring CDP compatibility
To make your switch work with Cisco IP phones, you must enable CDP compatibility.
CDP compatibility enables your switch to receive and recognize CDP packets from a Cisco IP phone and
respond with CDP packets.
Configuration prerequisites
Before configuring CDP compatibility, complete the following tasks:
• Enable LLDP globally.
• Enable LLDP on the port connecting to an IP phone.
• Configure LLDP to operate in TxRx mode on the port.
Configuration procedure
CDP-compatible LLDP operates in one of the follows modes:
• TxRx—CDP packets can be transmitted and received.
• Disable—CDP packets cannot be transmitted or received.
To make CDP-compatible LLDP take effect on a port, follow these steps:
1. Enable CDP-compatible LLDP globally.
2. Configure CDP-compatible LLDP to operate in TxRx mode on the port.
The maximum TTL value that CDP allows is 255 seconds. To make CDP-compatible LLDP work correctly
with Cisco IP phones, make sure the product of the TTL multiplier and the LLDP frame transmission interval
is less than 255 seconds.
To enable LLDP to be compatible with CDP:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enable CDP compatibility
globally.
lldp compliance cdp
By default, CDP
compatibility is disabled.