1500 I've encountered a problem on a cisco ws-c3750x-48ts-s where jumbo-frames won't cross a trunk-connection between a vwmare esx-host and the switch :
the access ports in the same vlan don't experience any problems.
I suspect that the problem lies with the mtu for the SVI for that vlan, since it's derived from the system mtu value and not the system-mtu jumbo command :
*<hostname>*#show vlan mtu
VLAN SVI_MTU MinMTU(port) MaxMTU(port) MTU_Mismatch
---- ------------- ---------------- --------------- ------------
1 1500 9198 9198 No
10 1500 9198 9198 No
20 1500 9198 9198 No
30 1500 9198 9198 No
31 1500 9198 9198 No
150 1500 9198 9198 No
151 1500 9198 9198 No
200 1500 9198 9198 No
250 1500 9198 9198 No
255 1500 9198 9198 No
444 1500 9198 9198 No
*<hostname>*#show interfaces vlan 150
Vlan150 is up, line protocol is up
Hardware is EtherSVI, address is c89c.1d49.b245 (bia c89c.1d49.b245)
Description: iSCSI
Internet address is 10.150.7.254/21
MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 1/255
is there a way to increase the SVI MTU to 9198, since system mtu has a max-value of 1998