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Network packet drops on IPLC link at the same time

Hi Folks,

I am working as a network engineer and of lately I am experiencing a strange problem that was never there earlier.

We have 2 IPLC links to the USA and at both the ends we are using Cisco 2821 routers. Also, we have 2 intra-office lease line circuits configured on this router.

We have configured the 2 IPLC links as Multilinks.

Off lately, exactly at 5.15 pm I am seeing high latency and lot of packet drops on the network.

It lasts for 15-20 mins and then gets optimized.

If anyone here have experienced this issue, kindly share the same.

I am unable to figure out the root cause of this issue. Not sure if it is application related or Network related.

Thanks & Regards,