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LLDP "Operational MAU type" (802.3 TLV) is zero for GS724Tv3
Versions Model Name Boot Version Software Version B5.1.1.1 5.4.2.19 I've enabled the optional LLDP TLVs on all my ports. When I receive the 802.3 organizationally specific TLV subtype 1, the oerational MAU type is zero. What the operational MAU type should be is 30. The RFC for this is: dot3MauType1000BaseTFD OBJECT-IDENTITY STATUS current DESCRIPTION "Four-pair Category 5 UTP, full duplex mode" REFERENCE "[IEEE 802.3 Std.], Section 40" ::= { dot3MauType 30 } When I check on the web interface, it shows 1000mbit, full duplex. The switch can only do 1000-base-t on 4 pair of unshielded twisted pair. It would be handy to be able to get this information and verify that everything was as it should be. But the latest firmware (just downloaded it) gives a zero. This is the wrong answer ;-) Here's what the dump of the TLV shows: ORG SPECIFIC DUMP: 00120f: DUMP (9 bytes): 00 12 0f 01 03 00 01 00 00 You can read about this in Annex G of the 802.1AB (LLDP) spec. On my copy this spans pages 132 and 133. An OUI of 00-12-0F means it's the 802.3 TLV (as I expect). The last two bytes (octets) are the "operational MAU type". As you can see they are both zero. The only reason for them to be zero is if the type of MAU isn't listed in RFC 3636. But it is. So, it's an error for it to be zero.