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Connecting a switch with large packets enabled to a switch without large packets.

I have a rack with a VMware cluster, SAN, and 2 Dell n3048 switches.  The 2nd rack has all end point termination for fiber and network users with 2 n3048 switches.  Currently the 2 racks are connected with a cat 6 cable.  I'm wanting to change the connection to one of the 10gb fiber ports but curious what is the recommended method for connecting these switches with different MTU sizes?
Tom Maxwell
Tom Maxwell
2 Solutions
Blue Street TechLast KnightCommented:
Hi Tom,

When there are two different MTU sizing then you will expect to see some inefficiencies as the smaller one will fragment the packets if the receiving side it larger than the switches size. Are you implementing Jumbo Frames? If you are going to go down that road then the MTU size needs to be the same for all hosts within the same subnet. Otherwise you may run into serious performance issues typically on a processor level on the receiving device.

Also from the beginning of the network you should dial in your MTU sizing on the firewalls. Here is an article I wrote on how to do it: https://www.experts-exchange.com/articles/12615/Unstable-Slow-Performing-Networks-or-VPNs-just-go-grocery-shopping.html

Let me know if you have any other questions!
Tom MaxwellNetwork AdministratorAuthor Commented:
Thank you, I need to rethink this and contact the people who designed this layout.  I've inherited this network that was partially setup when I took this position. Reading your article now.
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Storage Network if you have one use Jumbo Frames, whatever you vendor states is a jumbo frame.

I would use standard MTU for all other network and VMs.
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