Over the past two weeks our network has been experiencing sluggish intermittent problems with a Frame over ATM circuit.
Nothing has been changed from our side, and the fault only occurs every day or to during peak business hours. I've checked, and doublechecked all the interfaces and usual places, but they all look fine. The carrier has been contacted, and its beeen flagged with their level 3 team. Looks OK.
When the problem occurs, any traffic across the link starts to experience packet loss, high latency etc. EIGRP neighbors don't drop, and the backup ISDN circuit doesn't trip.
Can anyone suggest a possible cause? Although the frame stats don't show it(DE packets), to me it sounds like our carrier is oversubscribed...