inS_CnGE28FX4TX_rEv–
08/31/12 PAGE 23
INSTALLATION AND OPERATION MANUAL
CNGE28FX4TX
Tech SupporT: 1.888.678.9427
LLDP Port Configuration
Label
Description
Port
The switch port number of the logical LLDP port.
Mode
Select LLDP mode.
Rx only The switch will not send out LLDP information, but LLDP information from
neighbor units is analyzed.
TX only The switch will drop LLDP information received from neighbor’s, but will send
out LLDP information.
Disabled The switch will not send out LLDP information, and will drop LLDP information
received from neighbor’s.
Enabled The switch will send out LLDP information, and will analyze LLDP information
received from neighbor’s.
CDP Aware
Select CDP awareness.
The CDP operation is restricted to decoding incoming CDP frames (The switch doesn’t
transmit CDP frames). CDP frames are only decoded if LLDP for the port is enabled.
Only CDP TLVs that can be mapped into a corresponding field in the LLDP neighbor’s
table are decoded. All other TLVs are discarded (Unrecognized CDP TLVs and discarded
CDP frame are not shown in the LLDP statistic. Only). CDP TLVs are mapped into LLDP
neighbor’s 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 neighbor’s 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 supports “system capabilities”, but the CDP capabilities cover
capabilities that are not part of the LLDP. These capabilities are shown as “others” in the
LLDP neighbor’s 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.
Note: When CDP awareness for a port is disabled the CDP information isn’t removed
immediately, but will be removed when the hold time is exceeded.
Port Descr
Optional TLV: When checked the “port description” is included in LLDP information
transmitted.
Sys Name
Optional TLV: When checked the “system name” is included in LLDP information
transmitted.
Sys Descr
Optional TLV: When checked the “system description” is included in LLDP information
transmitted.
Sys Capa
Optional TLV: When checked the “system capability” is included in LLDP information
transmitted.
Mgmt Addr
Optional TLV: When checked the “management address” is included in LLDP information
transmitted.
