bbravo, I have been using MLFR for about 6months now and I have found it to be a definite benefit.. For one, you can aggregate NxT1's into a bundle interface and they will all be represented as MFR interface that you can setup properties on.. You have the ability to remove one of the NxT1's from the bundle interface and continue to operate over it... There are several docs. available. Even though it's fairly new, I feel that it will be the way to go to position yourself for future growth...
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If you are a registered CCO member, try using the Software Bug Toolkit to find out if there are any issues relating to arp/cef. You should be able to find anything relating to this problem based on IOS or problem.
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