Black Box LGB1126A-R2 - Page 106

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Parameter description:
LLDP Parameters
 Tx Interval: The switch periodically transmits LLDP frames to its neighbors so the network discovery information is 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 the information in the LLDP frame will 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 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.
LLDP Port Configuration
The LLDP port settings relate to those currently selected, as reflected by the page header.
 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 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 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 a 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 “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 is 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.
CHAPTER 3: SYSTEM CONFIGURATION