Thursday, May 6, 2021

Multilink PPP issue over T1s

Having a strange issue that I've not run into before. We have a 4xT1 connection to an MPLS cloud bundled into a multilink PPP interface. Outbound to the cloud we're able to get between 5-5.5 Mbps throughput, inbound from the cloud we're only seeing about 1.8Mbps with occasional spikes to 2.4Mbps. We've been running tests for the past 12 hours or so using iperf at either end of the connection and making various adjustments to no avail. Anyone have experience with this and any ideas what I should be looking for?

Setup:

Cisco 2951 with 2 T1s on VWIC3-2MFT-T1/E1 card and 2 T1s on VWIC3-4MFT-T1/E1 card

T1s bundled into multilink bundle and connected to provider MPLS Cloud

On the other side:

Cisco 2951 with 10Mbps ethernet connection into provider MPLS Cloud.

Static routing is setup with the provider



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