Have you tried swapping the two interfaces between the chassis?

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> On 21 Apr 2015, at 01:16, Jeroen van Ingen <[email protected]> wrote:
> 
> Hi,
> 
>> Haven't followed this thread too carefully, so I apologize if I
>> duplicated anyone's suggestion:
>> 
>> Have you checked for:
>> 
>> 1) Are these systems setup for NHRP (hsrp, glbp, vrrp)? If so, is
>> the box that is having the issue the active node?
> 
> Running HSRP, but doesn't make a difference which of the two routers is 
> active. The second router is currently active for all interfaces and groups.
> 
>> 2) Are you running PIM? Is this box the DR?
> 
> Yes, running PIM-SM. This box is DR on some subinterfaces and not on a few 
> others, but changing DR priority doesn't seem to make a difference.
> 
>> 3) Have you checked to see if there is traffic headed to the box,
>> rather than through it that is causing the issue?
> 
> I don't see how it could be related to any traffic coming into the 
> interfaces, because the interfaces are programmed to handle certain features 
> in software even when they are not receiving any traffic.
> 
> 
> Regards,
> 
> Jeroen van Ingen
> ICT Service Centre
> University of Twente, P.O.Box 217, 7500 AE Enschede, The Netherlands
> 
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