Administrator Guide

1496 Class-of-Service
Dell Networking implements ECN capability as part of the WRED
configuration process. Eligible packets are marked by hardware based upon
the WRED configuration. The network operator can configure any CoS
queue to operate in ECN marking mode and can configure different discard
thresholds for each color.
Enabling ECN in Microsoft Windows
On many current Windows implementations, ECN capability is enabled via
the netsh command as follows:
netsh int tcp set global ecncapability=enabled
The capability can be verified with the command netsh int tcp show global.
An example is shown below:
C:\Users\jmclendo>Netsh int tcp set global ecncapability=enabled
Ok.
C:\Users\jmclendo>netsh int tcp show global
Querying active state...
TCP Global Parameters
----------------------------------------------
Receive-Side Scaling State : enabled
Chimney Offload State : automatic
NetDMA State : enabled
Direct Cache Access (DCA) : disabled
Receive Window Auto-Tuning Level : normal
Add-On Congestion Control Provider : none
ECN Capability : enabled
RFC 1323 Timestamps : disabled
In Windows Server 2012, DCTCP is self-activating based on the RTT of TCP
packets. No user management is required. Use the PowerShell cmdlet Get-
NetTcpConnection to verify DCTCP operation.