In a typical 3 tiered infrastructure I would assume it must be commonplace practice to house some vlans with Jumbo frames support. We have 2 options currently connecting devices from access to distribution.
Access Distribution 3550 <-> 6500 4500 <-> 6500 We have customers segmented on L2/L3 vlans requesting Jumbo frames in various environments. Some request separate hardware altogether like for Oracle RAC. How have you guys seen this implemented? Cheers, // LeBlanc On Dec 28, 2009, at 1:40 PM, Mack McBride wrote: > If jumbo frames are enabled on edge ports but not in the middle there can be > issues. > Layer 2 will not fragment packets and layer 3 will fragment in software. > It is better to have jumbos in the middle but not on the edges where there > will not be issues. Basically the smallest packet size should be at the edge > and the core > should have a larger size than the edge. > > LR Mack McBride > Network Architect > Viawest, Inc. > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of Jason LeBlanc > Sent: Monday, December 28, 2009 10:09 AM > To: Marko Milivojevic > Cc: [email protected] > Subject: Re: [c-nsp] MTU Mismatch > >> From a routing perspective this makes sense. Will there be any adverse >> effects if the Jumbo frames is bumped up anywhere in the chain? Meaning L2 >> vs. the L3 Routing. I believe thats where the MTU path discovery comes into >> play correct? Sorry to add to this but while we were on the subject I >> figured I would ask :) We want to use jumbo frames in a few environments >> but not at the cost of anything in the path. > > Cheers, > > // LeBlanc > > On Dec 28, 2009, at 9:09 AM, Marko Milivojevic wrote: > >> On Mon, Dec 28, 2009 at 16:00, Mohammad Khalil <[email protected]> wrote: >>> >>> i have checked the mtu on 3750 >>> sh system mtu >>> >>> System MTU size is 1500 bytes >>> System Jumbo MTU size is 1512 bytes >>> Routing MTU size is 1500 bytes >>> >>> but there is no such command on the 6523 >> >> Different beast, but at least you get the explanation. As far as >> routing processes go, MTU on 3750 is 1500. On 6500 you can set it per >> interface (depending on the LC). >> >> -- >> Marko Milivojevic - CCIE #18427 >> Senior Technical Instructor - IPexpert >> >> Mailto: [email protected] >> Telephone: +1.810.326.1444 >> Live Assistance, Please visit: http://www.ipexpert.com/chat >> eFax: +1.810.454.0130 >> _______________________________________________ >> cisco-nsp mailing list [email protected] >> https://puck.nether.net/mailman/listinfo/cisco-nsp >> archive at http://puck.nether.net/pipermail/cisco-nsp/ > > _______________________________________________ > cisco-nsp mailing list [email protected] > https://puck.nether.net/mailman/listinfo/cisco-nsp > archive at http://puck.nether.net/pipermail/cisco-nsp/ _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
