Cisco SPA509G Administration Guide - Page 155
Port ID TLV, Time to Live TLV, End of LLDPDU TLV, Port Description TLV, System Name TLV
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Configuring Security, Quality, and Network Features Configuring VLAN Settings for IP Phones 5 Port ID TLV For the outgoing LLDPDU, the TLV supports sub-type=3 (MAC address). The 6 octet MAC address for the Ethernet port is used for the value of Port ID in wired or wireless mode. For the incoming LLDPDU, the Port ID TLV is treated as an opaque value to form the MSAP identifier. The value is not validated against its sub-type. The Port ID TLV is mandatory as the second TLV. Only one Port ID TLV is allowed for the outgoing and incoming LLDPDUs. Time to Live TLV For the outgoing LLDPDU, the Time to live TTL value is 180 seconds. This is different from 120 seconds as recommended by the standard. For the shutdown LLDPDU, the TTL value is always 0. The Time to Live TLV is mandatory as the third TLV. Only one Time to Live TLV is allowed for the outgoing and incoming LLDPDUs. End of LLDPDU TLV The value is 2-octet, all zero. This TLV is mandatory and only one is allowed for the outgoing and incoming LLDPDUs. Port Description TLV For the outgoing LLDPDU, in the Port Description TLV, the value for the port description is the same as "Port ID TLV" for CDP. The incoming LLDPDU, the Port Description TLV, is ignored and not validated. Only one Port Description TLV is allowed for outgoing and incoming LLDPDUs. System Name TLV For the outgoing LLDPDU, in the System Name TLV, the value is the same as 'Platform TLV" for CDP. For the Cisco SPA525G2, the name is "SPA525G2." The incoming LLDPDU, the System Name TLV, is ignored and not validated. Only one System Name TLV is allowed for the outgoing and incoming LLDPDUs. System Capabilities TLV For the outgoing LLDPDU, in the System Capabilities TLV, the bit values for the 2 octet system capabilities field should be set for Bit 2 (Bridge) and Bit 5 (Phone) for a phone with a PC port. If the phone does not have a PC port, only Bit 5 should be set. The same system capability value should be set for the enabled capability field. For the incoming LLDPDU, the System Capabilities TLV is ignored. The TLV is not validated semantically against the MED device type. The System Capabilities TLV is mandatory for outgoing LLDPDUs. Only one System Capabilities TLV is allowed. Cisco Small Business SPA300 Series, SPA500 Series, and WIP310 IP Phone Administration Guide 154