Can jumbo Ethernet frames be VLAN-tagged?

StackOverflow https://stackoverflow.com/questions/22400754

  •  14-06-2023
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Question

I understand that jumbo Ethernet frames are identified by a value of 0x8870 in the length/type field. (Reference: http://en.wikipedia.org/wiki/EtherType) Tagged VLAN frames are identified by a type of 0x8100.

This being the case, is it possible for a jumbo frame to be VLAN-tagged? How does that work?

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Solution

I understand that jumbo Ethernet frames are identified by a value of 0x8870 in the length/type field. (Reference: http://en.wikipedia.org/wiki/EtherType) Tagged VLAN frames are identified by a type of 0x8100.

This being the case, is it possible for a jumbo frame to be VLAN-tagged? How does that work?

Jumbo frames don't use 0x8870; whoever edited wikipedia to say that Ethertype 0x8870 is for jumbos was over-reaching. This ethertype was proposed by an IETF draft; however, that expired and was never adopted.

IEEE strongly opposes changing the original ethernet spec, which officially limited ethernet to a 1500 byte payload. IEEE Chairman Geoff Thompson wrote a pretty thorough critique against adopting jumbo frames. In short, ethernet is more than just a frame format, it's also hardware spec; you should not attempt to separate the two.

All vlan-tagged Ethernet II frames use ethertype 0x8100

OTHER TIPS

0x8100 just indicates the optional 802.1Q tag consisting of four bytes total. After that the actual Ethertype value and the rest of the frame follows.

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