We just bought a bundle of 2x 5548Ps and 20x 2248s in order to converge our
data and storage networks in our new datacenter. After carefully reading the
configuration limitations document and designing around the limitations for our
migration, we pulled the trigger and bought the material. The document that I
used as prep work for the actual deployment was Data Center Access Design with
Cisco Nexus 5000 Series Switches and 2000 Series Fabric Extenders and Virtual
PortChannels. I planned on being able to hook the Nexus up to our distribution
switches and standalone iSCSI network for the migration process and to provide
L3 services (because of the limitations with using the L3 routing modules)
Now on to our issue:
The document states that you can configure per-interface MTU size. Our data
network distribution switches are 3560s and run the standard MTU size of 1500.
Our iSCSI network, on the other hand, use jumbo frames with a MTU of 9000.
After trying the steps outlined in the document, I have only been able to set
the MTU globally on the Nexus to jumbo or non-jumbo. After contacting TAC, they
have initially confirmed that the MTU qos policy can only be applied at the
system level, not per interface.
So, any ideas other than not converging our networks and buying a standalone
4900 or 3750x series pair for our iSCSI network? Sorry if it's wordy, but this
is the content I gave to TAC as well.
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