Dell PowerConnect FCS624S Configuration Guide - Page 732

24 General operating principles • 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. TABLE 121 Chassis ID subtypes ID subtype Description 0 1 2 3 4 5 6 7 8 - 255 Reserved Chassis component Interface alias Port component MAC address Network address Interface name Locally assigned Reserved 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. 690 PowerConnect B-Series FCX Configuration Guide 53-1002266-01