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New Member

Cat 2960G-24TC-L MTU problem

We have a Catalyst 2960G-24TC-L switch. I have set the 'jumbo frame mtu 9000'. When I try to ping a server located on G0/19 port from G0/1-4 ports the sever do not reply those requests for which packet size is above 1500 byte. It happens only that case, when I try to ping from a gigabit NIC. Everything is OK if the source switchports are different from the ports G0/1-4 or I try to ping from fastethernet NIC.

One more addition: First time, when I turned the switch on I set the first four switchports' speed to 100M and duplex full state. Later, when they changed the NIC from 100 Mbps to 1000 Mbps I set the ports state to auto. I have loaded the newest IOS to the swith, and reloaded it many times. The problem seems persistent.

Anyone has an idea?

8 REPLIES

Re: Cat 2960G-24TC-L MTU problem

Hi,

Can you try forcing the speed/duplex on the interfaces g0/1-4 to 1000/full and then repeat your tests?

-VJ

New Member

Re: Cat 2960G-24TC-L MTU problem

Unfortunately it did not solve our problem.

New Member

Re: Cat 2960G-24TC-L MTU problem

How can i force the Port on 2960G to Full Speed/Duplex Please ?

Thanks

Hall of Fame Super Gold

Re: Cat 2960G-24TC-L MTU problem

Dave,

interface

speed <10, 100, 1000>

duplex full

New Member

Re: Cat 2960G-24TC-L MTU problem

Thanks

I tried this on my 2960G switch and i can not enable it.

Hall of Fame Super Gold

Re: Cat 2960G-24TC-L MTU problem

Gyozo,

Is the server configured to transmit jumbo frame?

Re: Cat 2960G-24TC-L MTU problem

Yes, please make sure the server is configured for JF. Also, you might want to change MTU size on the VLAN.

New Member

Re: Cat 2960G-24TC-L MTU problem

Thank's for your help. In the meantime we have replaced the switch in warranty.

Gyozo

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