Dell PowerConnect B-RX Configuration Manual page 330

9
General operating principles
There are several ways in which a port may be identified, as shown in
included in the TLV, indicates how the port is being referenced in the Port ID field.
TABLE 60
ID Subtype
0
1
2
3
4
5
6
7
8 – 255
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).
The LLDPDU format is shown in
The Port ID TLV format is shown below.
FIGURE 18
TTL value
The Time to Live (TTL) Value is the length of time the receiving device should maintain the
information acquired through 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):
•
258
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 = 2 TLV Information
String Length
9 bits
7 bits
TLV Header
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 or port with the information in the
received LLDPDU.
0012.f233.e2d3
"LLDPDU packet format" on page 256.
Port ID Subtype
1 octet
TLV Information String
Table 60. A port ID subtype,
Port ID
1 < < 255 octets
BigIron RX Series Configuration Guide
53-1001986-01