topic RE: IP MTU on EX switch in ExtremeSwitching (EXOS/Switch Engine)

IP MTU on EX switch

zeeshan_qadir — Wed, 17 Jun 2015 20:59:00 GMT

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.

RE: IP MTU on EX switch

Luke_French — Wed, 17 Jun 2015 22:29:00 GMT

https://gtacknowledge.extremenetworks.com/articles/How_To/How-to-change-MTU-size-on-a-VLAN/

RE: IP MTU on EX switch

Ken_Thomas — Thu, 18 Jun 2015 19:58:00 GMT

Zeeshan, let us know if the gtac kb article provided answers your question or if you have any follow questions

RE: IP MTU on EX switch

zeeshan_qadir — Sat, 20 Jun 2015 11:57:00 GMT

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

RE: IP MTU on EX switch

Chad_Smith1 — Thu, 25 Jun 2015 22:05:00 GMT

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?