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m Reverted 2 edits by Krishnamurthy GovindaReddy (talk) to last revision by Jbiggley |
→Frame structure: End of LLDPDU TLV are optional according to IEEE 802.1AB-2016 chapter 8.4 |
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The Ethernet frame used in LLDP typically has its destination [[MAC address]] set to a special [[multicast address]] that [[802.1D]]-compliant bridges do not forward. Other multicast and unicast destination addresses are permitted. The [[EtherType]] field is set to 0x88cc.
Each LLDP frame starts with the following mandatory TLVs: ''Chassis ID'', ''Port ID'', and ''Time-to-Live''. The mandatory TLVs are followed by any number of optional TLVs. The frame optionally ends with a special TLV, named ''end of LLDPDU'' in which both the ''type'' and ''length'' fields are 0.
Accordingly, an Ethernet frame containing an LLDPDU has the following structure:
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! Time to live TLV
! Optional TLVs
! Optional End of LLDPDU TLV
! [[Frame check sequence]]
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! TLV type !! TLV name !! Usage in LLDPDU
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| 0 || End of LLDPDU ||
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| 1 || Chassis ID || Mandatory
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