C
HAPTER
18
| LLDP Commands
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lldp cdp_aware This command displays or configures whether or not discovery information
from received CDP frames is added to the LLDP neighbor table.
SYNTAX
lldp cdp_aware [port-list] [enable | disable]
port-list - A specific port or range of ports. (Range: 1-28, or all)
enable - Enables decoding of Cisco Discovery Protocol frames.
disable - Disables decoding of Cisco Discovery Protocol frames.
DEFAULT SETTING
Disabled
COMMAND USAGE
◆ If enabled, CDP TLVs that can be mapped into a corresponding field in
the LLDP neighbors table are decoded, all others are discarded. CDP
TLVs are mapped into LLDP neighbors table as shown below:
■
CDP TLV “Device ID” is mapped into the LLDP “Chassis ID” field.
■
CDP TLV “Address” is mapped into the LLDP “Management Address”
field. The CDP address TLV can contain multiple addresses, but only
the first address is shown in the LLDP neighbors table.
■
CDP TLV “Port ID” is mapped into the LLDP “Port ID” field.
■
CDP TLV “Version and Platform” is mapped into the LLDP “System
Description” field.
■
Both the CDP and LLDP support “system capabilities,” but the CDP
capabilities cover capabilities that are not part of LLDP. These
capabilities are shown as “others” in the LLDP neighbors table.
◆ If all ports have CDP awareness disabled, the switch forwards CDP
frames received from neighbor devices. If at least one port has CDP
awareness enabled, all CDP frames are terminated by the switch.
◆ When CDP awareness for a port is disabled, the CDP information is not
removed immediately, but will be removed when the hold time is
exceeded.
EXAMPLE
LLDP>cdp_aware enable
LLDP>
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