The frames never get fragmented

Hello

a few questions about the jumbo frames.

(1) if the switch is NOT configured to support jumbo frame is always deleted or are there conditions under which framework gets fragmented.

(2) if they are always deleted then what type of images get fragmented?

(3) if the support of extended frames is configured on the switch, but output to a 1841 router port is 100 MB, I understand that the frames are removed.  Is there a way to solve this problem. If the link to the router is upgraded to gigabit framework will pass through the port of output to the router? will be the fragment of the router and get it from?

Thank you

Hi Charly,

fragmentation happen to L3 L2 (unless we treat FR or ATM or other technologies). Of course it does not apply to ethernet.

Another important concept is that the MTU MUST be configured with the same value to each L3 link between 2 routers.

ROUTER1 1500 - 1500 ROUTER2 9000 - 9000 9000-9000 1500 router4 router3 - 1500 router5

fragmentation will occur with router4 router5 assuming that router4 receives a frame with size router3 9000 and fragmenting at least 6 small 1500 images to send to router5 (this school year as since our package ip probably comes from ROUTER1 its size will not exceed 1500).

If you have a mismatch between the 2 ends of a link MTU you drops in the sense more-to-small

ROUTER1 9000 - 1500 ROUTER2

ROUTER2 will drop all frames more than 1500 (a little more) from ROUTER1

This scenario is clearly a configuration error!

If you enable the support over a link, you need to be sure that the other side of it, there are an l3 device that also takes in charge jumbo frames

L2 switches a drop frames larger than the mtu of port... but if this happens to you clearly configured something wrong.

Say that you assign to a port of a switch L2 9000 L2, as the mtu is calculated to l3 of the actual image size is calculated by the unit of L3 (host or router) that sends the frame, so most likely will be 1500. There is so no risk to give up anything on the switch.

hope that clarifies

Riccardo

Tags: Cisco Network

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