Dell PowerConnect B-FCXs Configuration Manual page 733

TABLE 122
ID subtype
0
1
2
3
4
5
6
7
8 – 255
Dell PowerConnect devices use port ID subtype 3, the permanent MAC address associated with the
port. Other third party devices may use a port ID subtype other than 3. The port ID appears similar
to the following on the remote device, and in the CLI display output on the Dell PowerConnect
device (show lldp local-info).
The LLDPDU format is shown in
The Port ID TLV format is shown below.
FIGURE 118
TTL value
The Time to Live (TTL) Value is the length of time the receiving device should maintain the
information acquired by LLDP in its MIB.
The TTL value is automatically computed based on the LLDP configuration settings. The TTL value
will appear similar to the following on the remote device, and in the CLI display output on the Dell
PowerConnect device (show lldp local-info).
If the TTL field has a value other than zero, the receiving LLDP agent is notified to completely
replace all information associated with the LLDP agent/port with the information in the received
LLDPDU.
If the TTL field value is zero, the receiving LLDP agent is notified that all system information
associated with the LLDP agent/port is to be deleted. This TLV may be used, for example, to signal
that the sending port has initiated a port shutdown procedure.
The LLDPDU format is shown in
The TTL TLV format is shown below.
PowerConnect B-Series FCX Configuration Guide
53-1002266-01
Port ID subtypes
Description
Reserved
Interface alias
Port component
MAC address
Network address
Interface name
Agent circuit ID
Locally assigned
Reserved
Port ID (MAC address):
Port ID TLV packet format
TLV Type = 3
7 bits
Time to live: 40 seconds
0012.f233.e2d3
"LLDPDU packet format" on page 688.
TLV Information
String Length = 2
9 bits
"LLDPDU packet format" on page 688.
General operating principles
Time to Live (TTL)
2 octets
24
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