Interlogix NS3550-8T-2S User Manual - Manual (Page 255)

255
The page includes the following fields:
LLDP Parameters
Object Description

Tx Interval
The switch is periodically transmitting 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.
Default: 30 seconds
This attribute must comply with the following rule:
(Transmission Interval * Hold Time Multiplier) ≤65536, and Transmission Interval
>= (4 * Delay Interval)

Tx Hold 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.
TTL in seconds is based on the following rule:
(Transmission Interval * Holdtime Multiplier) ≤ 65536.
Therefore, the default TTL is 4*30 = 120 seconds.

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.
This attribute must comply with the rule:
(4 * Delay Interval) ≤Transmission Interval

Tx Reinit When a port 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 Port Configuration
The LLDP port settings relate to the currently selected stack unit, as reflected by the page header.
Object Description

Port The switch port number of the logical LLDP port.

Mode Select LLDP mode. All means all ports will have one specific setting.

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
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