User’s Manual of GS-5220 LCD Series
461
• 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 TLV "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 Description
Optional TLV: When checked the "port description" is included in LLDP
information transmitted.
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