Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. And see here for current known issues.

New Member

MTU Configuration

Hi,

Just want to ask what is the effect of configuring a higher MTU size besides higher throughput. Do i Have to configuring all my switches to have the same mtu sizes or those only that uses it?

Thanks.

8 REPLIES
Super Bronze

Re: MTU Configuration

"Just want to ask what is the effect of configuring a higher MTU size besides higher throughput."

Often less work on the forwarding engine, since much of the work is per frame/packet.

"Do i Have to configuring all my switches to have the same mtu sizes or those only that uses it?"

As long as other switches won't see the larger MTU frames, don't believe you need to configure them too.

New Member

Re: MTU Configuration

Hi Joseph,

the path that the packet will traverse will be the one that i'll be configuring is that what you mean? And also will it affect the machines that do not support jumbo frames?

Re: MTU Configuration

When you increase the MTU make sure you do to the devices interconnected, in your case I presume switches.

If one device has a smaller MTU than the other, it will cause fragmentation.

For reminder, MTU: Is the maximum packet size, in bytes, that can be transmitted across a link. The MTU determines the size of your packets, so if it is too small, your computer will be responding often. If it is too big, errors will cause each packet to be resent or there will be fragmentation.

New Member

Re: MTU Configuration

Hi Sir,

for example i configured a port on a 6500 to haave an mtu of 9000. All the switches that will be cascaded via this port should also be configured with that mtu, and all of the computer/servers connected via this switches should also have an mtu of 9000? am i correct?

Re: MTU Configuration

Yes that is correct.

But why do you want an mtu of 9000? What are you really trying to achieve?

New Member

Re: MTU Configuration

hi Sir,

I'm trying to have a higher throughput on my servers. Is it advisable?

Thanks.

Re: MTU Configuration

Not sure. Is the communication only between the servers, or goes to clients over for example a WAN link?

New Member

Re: MTU Configuration

hi sir,

Its for local area clients, server to server communications and over the WAN clients. Is it possible?

176
Views
0
Helpful
8
Replies
CreatePlease login to create content