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TOPIC: Ethernet frame

Ethernet frame 8 years 1 month ago #27140

  • GUNASEKAR
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Can any one explain me about length/Type (2 byte) in Ethernet frame.

As I aware if value in less than or equal to 1500 then this is 802.3(LLC) frame and if the value is more than 1500, then this frame is belong to ethernet II frame.

My questions:

1) how upper layer protocol are mentioned in this length/Type column?

2)802.3(LLC) means it only deal with layer 2 protocol ?

Kindly clarify my doubt:-)
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Re: Ethernet frame 8 years 1 month ago #27173

  • S0lo
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1) how upper layer protocol are mentioned in this length/Type column?

Each code maps to a different protocol.

[code:1]
EtherType Protocol
0x0800 Internet Protocol, Version 4 (IPv4)
0x0806 Address Resolution Protocol (ARP)
0x8035 Reverse Address Resolution Protocol (RARP)
0x809b AppleTalk (Ethertalk)
0x80f3 AppleTalk Address Resolution Protocol (AARP)
0x8100 IEEE 802.1Q-tagged frame
0x8137 Novell IPX (alt)
0x8138 Novell
0x86DD Internet Protocol, Version 6 (IPv6)
0x8819 CobraNet
0x88a8 Provider Bridging (IEEE 802.1ad)
0x8847 MPLS unicast
0x8848 MPLS multicast
0x8863 PPPoE Discovery Stage
0x8864 PPPoE Session Stage
0x888E EAP over LAN (IEEE 802.1X)
0x889A HyperSCSI (SCSI over Ethernet)
0x88A2 ATA over Ethernet
0x88A4 EtherCAT Protocol
0x88CD SERCOS-III
0x88D8 Circuit Emulation Services over Ethernet (MEF-8)
0x88E5 MAC security (IEEE 802.1AE)
0x8906 Fibre Channel over Ethernet
0x8914 FCoE initialization protocol
0x9100 Q-in-Q
0xCAFE Veritas Low Latency Transport (LLT)[/code:1]

Reference: en.wikipedia.org/wiki/Ethertype
2)802.3(LLC) means it only deal with layer 2 protocol ?

No, As far as I know, the LLC version has DSAP, SSAP fields that eventually determines the upper layer protocols. Full details are here: www.firewall.cx/ethernet-frames-802.3.php
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Ammar Muqaddas
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Re: Ethernet frame 8 years 1 month ago #27179

  • GUNASEKAR
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Thank you very much for the code maps.
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Re: Ethernet frame 8 years 1 month ago #27194

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Your always welcome :)
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