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690 PowerConnect B-Series FCX Configuration Guide
53-1002266-01
General operating principles
24
• Location identification
• Extended power-via-MDI
Mandatory TLVs
When an LLDP agent transmits LLDP packets to other agents in the same 802 LAN segments, the
following mandatory TLVs are always included:
• Chassis ID
• Port ID
• Time to Live (TTL)
This section describes the above TLVs in detail.
Chassis ID
The Chassis ID identifies the device that sent the LLDP packets.
There are several ways in which a device may be identified. A chassis ID subtype, included in the
TLV and shown in Table 121, indicates how the device is being referenced in the Chassis ID field.
Dell PowerConnect devices use chassis ID subtype 4, the base MAC address of the device. Other
third party devices may use a chassis ID subtype other than 4. The chassis ID 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).
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 Figure 122. A port ID
subtype, included in the TLV, indicates how the port is being referenced in the Port ID field.
TABLE 121 Chassis ID subtypes
ID subtype Description
0Reserved
1 Chassis component
2Interface alias
3Port component
4MAC address
5Network address
6Interface name
7 Locally assigned
8 – 255 Reserved