Dell BigIron RX Series, Руководство по настройке

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258 BigIron RX Series Configuration Guide
53-1002253-01
General operating principles
9
Chassis ID (MAC address): 0012.f233.e2c0
The Chassis ID TLV is always the first TLV in the LLDPDU.
Port ID
The Port ID identifies the port from which LLDP packets were sent.
There are several ways in which a port may be identified, as shown in Table 60 . A port ID subtype,
included in the TLV, indicates how the port is being referenced in the Port ID field.
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): 0012.f233.e2d3
The LLDPDU format is shown in “LLDPDU packet format” on page 256.
The Port ID TLV format is shown below.
FIGURE 18
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 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):
Time to live: 40 seconds
TABLE 60
Port ID subtypes
ID Subtype Description
0 Reserved
1 Interface alias
2 Port component
3 MAC address
4 Network address
5 Interface name
6 Agent circuit ID
7 Locally assigned
8 – 255 Reserved
TLV Type = 2 TLV Information
String Length
Port ID Subtype Port ID
TLV Header
TLV Information String
7 bits
9 bits
1 octet 1 <
n
< 255 octets