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WAN instability

In an MPLS scenario for a large number of sites spread across globe, accessing the app. in datacenter, packets are able to reach the target gateway edge router but the network beyond that (the datacenter app)are not accessible. What could be the preventing this? The network behind the edge router has no logs for outages/fluctuations etc.How ever the global network is resilient after 5 mins.Could it be BGP convergence issue? Appreciate your thoughts.

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Re: WAN instability

what routing protocol is running between PE-CE?

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