SD-WAN Edge underlay traffic is limited to 100Mbps throughput and excess traffic is dropped.
Article ID: 378344
Updated On:
Products
Issue/Introduction
On an SD-WAN Edge, traffic traversing the underlay of a routed interface may be limited to 100Mbps, and underlay traffic in excess of that will be dropped.
This may be observed as packet loss or slow to no connectivity for some applications, or a bandwidth test on a client showing about 100Mbps.
Cause
When a routed interface is configured as a WAN link (Enable WAN Link option), and has Underlay Accounting enabled, underlay traffic is restricted to 100Mbps, anything in excess gets dropped by the Link Scheduler (lsch_enq_drop). Underlay accounting is only needed if you wish to have this restriction on underlay traffic, in order to prevent underlay traffic from using too much bandwidth on a link that also has a WAN overlay.
Resolution
Uncheck the "Underlay Accounting" option on the interface configuration.
Additional Information
Disabling "Underlay Accounting" does not cause a service restart.
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