[j-nsp] Strange IS-IS Problem

Chuck Anderson cra at WPI.EDU
Mon Mar 8 12:55:29 EST 2010

On Mon, Mar 08, 2010 at 11:57:55AM -0500, Eric Van Tol wrote:
> Both MTUs are consistent and always have been.  I started out with 
> 9216 physical MTU and 1500 inet MTU, but have since just deleted the 
> custom MTU and went with the defaults.  I am quite sure now that 
> this is not an MTU issue, but rather a deficiency with the EX2500.  
> I've opened up a JTAC case and will let the list know what the 
> problem turns out to be.

But you didn't have the iso mtu set.  Which means iso was probably 
using 9216-6-6-4-2-3 = 9195 (or 9192-6-6-4-2-3 = 9171) by default for 
a VLAN encapsulated 802.2 LLC frame. Changing the inet MTU doesn't 
affect any non-IP protocols' MTUs.

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