It is likely that you have configured an SVI or a VLAN on the 6509 for
9216 already.
If any VLAN that crosses the switchport is 9216, then you can't adjust
the MTU of the port to a value below 9216.
Do a 'show vlan' and also check all the SVI's for an MTU higher than
1504, then either reduce the MTU in those locations or I think you could
also restrict the large VLAN from being sent on the trunk
--
Aaron Millisor
Michael Robson wrote:
I have a 6509 (with Sup720-3B) that contains 2 x WS-X6704-10GE blades
where I am trying to set the MTU to be 1504 on each of these interfaces.
On one blade it will only allow me to set the MTU to 9216 if the
interface is a switchport, the 1504 MTU size only becomes an option when
it is changed to a routed port. Since this is not the case on other
6509s we have, anyone have an idea why this might be happening (it maybe
worth noting that, at present, one of the other ports is a routed port
with MTU of 9216)?
Thanks,
Michael
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