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Multi-Link Frame-Relay Load Balancing

I have a customer that has 4 T1s MFR bundle to MPLS service provider. The T1s are terminated on a FlexWAN T3 card on the MPLS router and 4 port T1 card on Cisco ISR routers. Since this is a private MPLS provider they want the customer to be DCE and this is just plan point to pint T1s. Every time a provider DS3 drops for few second we loose all the T1s and then it come back up which is ok. The issue we are seeing is right after this happen we only see packets being trasmitted out of one T1 off the 4 Ts bundle. The only way we corrected the problem in the past is to reload the customer CE. Any thoughts would be helpful.

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