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Disabling of dDEF Results in Linecard becoming disabled

Hello Experts,

We have a problem with a linecard on our Cisco  12000 router being disabled when we attempt to upgrade the router to IOS  12.0.32SY14.

We are an ISP and we understand that the issue is  about dDEF being disabled. We also are aware that the minimum  requirement for the upgrade is 128MB on our linecard. We now have 512MB  installed on the linecard.

We have referenced the attached document.

http://www.cisco.com/en/US/products/hw/routers/ps359/products_tech_note09186a0080110d68.shtml

My  question is is there anything else other than upgrading our memory to  512MB that may be required to ensure that the next time we upgrade the  card won't again be disabled? For example, would I need to change the  current configuration from

ip cef linecard ipc memory 128000  to ip cef linecard ipc memory 512000?

Sorry  if there isn't enough information for you experts to give me a solid  opinion - let me know if you need additional information.

Cheers

Carlton

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