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3750G stack ,jumbo frame, Layer 3

Two 3750G-24TS-1U switches connected via stackwise cable.

Stack connected to 4507R via 802.1q trunks

4507 is VTP server

3750 stack is VTP client

I want to configure my Layer 2 VLAN165 with mtu size of 9000 for ISCSI connections to connect SAN appliance.

If I change size on 4507R is doesn't work.

If I try to change size on 3750, it says I can't make change because Im in client mode.

Should I change 3750 stack to VTP server and change 4507R to client?

Should I change 3750 stack to vtp mode transparent?

Also, I would like to run BGP instance on this 3750 stack. Do you see any issues?

I am open to any suggestion.

Please let me know if you need more info?

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