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New Member

Fast Ethernet MTU

What is the Maximum theoretical MTU siz for Fast Ethernet. Can it be as high as 4440 bytes?

3 REPLIES
Cisco Employee

Re: Fast Ethernet MTU

This is a fairly loaded question. The answer is, it depends and mostly platform/HW dependant. Some Cisco switches will allow you to configure Jumbo Frames, which can be up to 9216 bytes on the 6500 platform. What is the purpose of your question?

Harold Ritter
Sr. Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México 
Paseo de la Reforma 222 Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México
New Member

Re: Fast Ethernet MTU

In a cisco test a question asked for the maximum MTU size on Fast. Ethernet.Options were:

64

1500

1518

4400

I know it's not 64.

Cisco Employee

Re: Fast Ethernet MTU

In the context of this test, I believe the answer would be 1500. 1518 would be the size of the Ethernet frame with the header and preamble.

Harold Ritter
Sr. Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México 
Paseo de la Reforma 222 Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México
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