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The switch periodically transmits LLDP frames to its neighbors for having the network discovery
information up-to-date. The interval between each LLDP frame is determined by the Tx Interval value.
Valid values are restricted to 5 - 32768 seconds.
Tx Hold
Each LLDP frame contains information about how long time 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.
Tx Delay
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.
Tx Reinit
When a interface is disabled, LLDP is disabled or the switch is rebooted, a 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.
LLDP INTERFACE CONFIGURATION
Interface
The switch interface name of the logical LLDP interface.
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 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 neighbors.
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 interface 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 TLV 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 interfaces have CDP awareness disabled the switch forwards CDP frames received from neighbor
devices. If at least one interface has CDP awareness enabled all CDP frames are terminated by the switch.
PAGE 161
OPTICAL SYSTEMS DESIGN
OSD2524 OPERATOR MANUAL
DOC ID: 10120001
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