Users Guide

Table Of Contents
Class-of-Service 1587
example, N1500 series) cannot support ECN. 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.