IP MTU on EX switch


Hi everybody,

I want my switch to pass IP packet of 2000 bytes it generated.

Here is my config:

create vlan NEE
config vlan NEE tag 45
config vlan NEE ipaddress 199.199.199.1 255.255.255.252

configure ip-mtu 2000 Vlan NEE

All ports are enabled for jumbo frames.

Am is missing anything as far as this switch is concerned ?

Thanks.

4 replies

https://gtacknowledge.extremenetworks.com/articles/How_To/How-to-change-MTU-size-on-a-VLAN/
Zeeshan, let us know if the gtac kb article provided answers your question or if you have any follow questions
Hi Thomas,

This is what I am seeing:( to the best of my memory, I do not have access to the switch right now)

vlan Zee ipaddress 199.199.199.1/30

config ip-mtu 2000 vlan ZEE

enable jumbo frames ports all

Now if i issue ping from the switch to 199.199.199.2 size 1800 ( neighboring device)with DF bit set, I get following:

Packets is to large, DF bit set, can not fragment it reply from 199.199.199.1

##############################################

I want to be able to generate such packets so we can check if service provider is allowing such packet across the cloud without fragmentation.

Thanks
Userlevel 6
Zeeshan,

The configuration changes you have made seem to be correct. Were you able to make any progress on this?

Are the switch and 199.199.199.2 directly connected?

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