Switches - best bang for the buck?

We have 2 Dell 5424 switches on our configuration of vsphere 5.0. They are limited to 9000 mtu of the extended frames and I'd like to find a model that can handle up to 9216. The series 6xxx Dell starts at $1770. Can anyone recommend something less expensive which will do what I need?

Thank you.

zenking wrote:

Our Win2k8 R2 VM have the vNIC e1000, which seem to 9014 MTU with no way to set the value. The NPI vswitches and host are on 9000, but I understand that they allow for the overload of the header. The 5424 is stuck at 9000 and does not load. vmkping test the upper part to 8972 (given that the header is added), so the switch must be the bottleneck, unless I'm wrong about the vswitch supporting header.

The 9014's only kinda silly way of saying 9000... The MTU is 9000 and the 14 additional is what they think is the overload of layer two (14 bytes at the front of the chassis), but they also forgot the checksum CRC 4 bytes at the end.

Two things though: the 8972 is expected to vmkping load and actually show that your network is working properly. For details of this see: http://rickardnobel.se/troubleshoot-jumbo-frames-with-vmkping

Secondly: it doesn't matter if a part of the network should really be able to use, for example 9200 and a few other 9000. As long as your infrastructure (vSwitches and physical switches) are also supported at least 9000 that would work very well. The hosts will not blindly send size frames to their maximum, but doesn't make a simple form of negotiation in the session TCP connection.

This means that your machines will select common MTU lowest, and the 9200 in your case won't be necessary. See for some details:

http://rickardnobel.se/different-Jumbo-frames-settings-on-the-same-VLAN

Tags: VMware

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