[c-nsp] MTU wierdness

[Aaron Millisor]

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