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Each LLDP frame contains information about how long the information in the LLDP frame
shall be considered valid. The LLDP information valid period is set to Tx Hold multiplied by Tx
Interval seconds. Valid values are restricted to 2 - 10 times.
If some configuration is changed (e.g. the IP address) a new LLDP frame is transmitted, but
the time between the LLDP frames will always be at least the value of Tx Delay seconds. Tx
Delay cannot be larger than 1/4 of the Tx Interval value. Valid values are restricted to 1 -
8192 seconds.
When a port is disabled, LLDP is disabled or the switch is rebooted, an LLDP shutdown
frame is transmitted to the neighboring units, signaling that the LLDP information isn't valid
anymore. Tx Reinit controls the amount of seconds between the shutdown frame and a new
LLDP initialization. Valid values are restricted to 1 - 10 seconds.
The LLDP port settings relate to the currently selected entry as reflected by the page header.
The switch port number of the logical LLDP port.
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 neighbors, but will send out
LLDP information.
Disabled: The switch will not send out LLDP information, and will drop LLDP information
received from neighbors.
Enabled: The switch will send out LLDP information and will analyze LLDP information
received from neigh ours.
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
neighbors 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 neighbors’ 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 TVL
can contain multiple addresses but only the first address is shown in the LLDP neighbors
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 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.
NOTE: When CDP awareness on a port is disabled the CDP information isn't removed
immediately, but gets dropped when the hold time is exceeded.
Optional TLV: When Checked the Port Description is included in LLDP information transmitted.
Optional TLV: When Checked the System Name is included in LLDP information transmitted.
Optional TLV: When Checked the System Description is included in LLDP information
transmitted.
Optional TLV: When Checked the System Capability is included in LLDP information
transmitted.
Optional TLV: When checked the “management address” is included in the LLDP
information transmitted.
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