Instruction Manual
80
[Rx only]
The switch will not send out LLDP information, but LLDP
information from neighbour units is analyzed.
[Tx only]
The switch will drop LLDP information received from
neighbours, but will send out LLDP information.
[Disabled]
The switch will not send out LLDP information, and will drop
LLDP information received from neighbours.
[Enabled]
The switch will send out LLDP information, and will analyze
LLDP information received from neighbours.
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 on the port is enabled.
Only CDP TLVs that can be mapped to a corresponding field
in the LLDP neighbours’ table are decoded. All other TLVs are
discarded (unrecognized CDP TLVs and discarded CDP frames
are not shown in the LLDP statistics). CDP TLVs are mapped
onto LLDP neighbours’ table as shown below.
CDP TLV “Device ID” is mapped to the LLDP “Chassis ID” field.
CDP TV “Address” is mapped to the LLDP “Management
Address” field. The CDP address TLV can contain multiple
addresses, but only the first address is shown in the LLDP
neighbours’ table.
CDP TLV “Port ID” is mapped to the LLDP “Port ID” field.
CDP TLV “Version and Platform” is mapped to the LLDP
“System Description” field.
Both the CDP and LLDP support “system capabilities”, but the
CDP capabilities cover capabilities that are not part of the
LLDP. These capabilities are shown as “others” in the LLDP
neighbours table. If all ports have CDP awareness disabled,
the switch forwards CDP frames received from neighbour
devices. If at least one port has CDP awareness enabled all
CDP frames are terminated by the switch.
Note:
When CDP awareness on a port is disabled the CDP
information isn’t removed immediately, but gets removed
when the hold time is exceeded.
Port Descr
Optional TLV: When selected, the “port description” is included
in LLDP information transmitted.