Port ID subtypes (Continued)
TABLE 22
ID subtype
Description
6
Agent circuit ID
7
Locally assigned
8 - 255
Reserved
Brocade 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 Brocade device (show lldp local-info).
Port ID (MAC address): 0000.0033.e2d3
The LLDPDU format is shown in
LLDP packets
on page 178.
The Port ID TLV format is shown below.
FIGURE 6
Port ID TLV packet format
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 Brocade
device (show lldp local-info).
Time to live: 40 seconds
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
LLDP packets
on page 178.
The TTL TLV format is shown below.
LLDP and LLDP-MED
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