Thanks for all the info. Thats what I thought, but I have people
checking on me.
Case closed.
Jeff
On Jun 11, 2009, at 1:13 PM, Peter Rathlev wrote:
On Thu, 2009-06-11 at 09:44 -0400, Jeff Fitzwater wrote:
We have the need to run two 3750 switches with jumbo frames (9000),
for a high performance data transfer application. Both switches will
be manages by connections to a NON-JUMBO frame environment. (That
is, if this will work)
If I enable jumbo frames (which is a global change) and leave the
management interface MTU at 1500 so the switch will use 1500 as
packet
size for all management, is there any NEGATIVE ISSUES I should be
aware because of them being connected to the non-jumbo environment?
This will not present problems. As David mentions only L2 switched
frames can be jumbo. Management-traffic wouldn't exceed the routing
MTU,
which is 1500 bytes by default. Changing the "system jumbo mtu"
doesn't
change the L3 MTU.
Any TCP based L3 connection would use the lowest of the two endpoint
MSSs anyway, so hosts connecting from 1500 byte MTU segments would
always end up using 1500 byte MTU connections. Even if you could
adjust
routing MTU to 9000 bytes you probably wouldn't face any problems.
IMHO there would never be any negative effects from enabling 9000
bytes
MTU, unless of course you explicitely WANT to limit the MTU.
Regards,
Peter
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