Administrator Guide

Version Description
9.8(1.0) Introduced on the Z9100-ON.
9.8(0.0P5) Introduced on the S4048-ON.
9.8(0.0P2) Introduced on the S3048-ON.
9.7(0.0) Introduced on the S6000-ON.
9.2(1.0) Introduced on the Z9500.
9.0.2.0 Introduced on the S6000.
8.3.19.0 Introduced on the S4820t.
8.3.11.1 Introduced on the Z9000.
8.3.7.0 Introduced on the S4810.
Usage Information
When you enable wred ecn, and the number of packets in the queue is below the minimum threshold, packets
are transmitted per the usual WRED treatment.
When you enable wred ecn, and the number of packets in the queue is between the minimum threshold and the
maximum threshold, one of the following two scenarios can occur:
• If the transmission endpoints are ECN-capable and trac is congested, and the WRED algorithm determines
that the packet should have been dropped based on the drop probability, the packet is transmitted and marked
so the routers know the system is congested and can slow transmission rates.
• If neither endpoint is ECN-capable, the packet may be dropped based on the WRED drop probability. This
behavior is the identical treatment that a packet receives when WRED is enabled without ECN congured on
the router.
When you enable wred ecn, and the number of packets in the queue is above the maximum threshold, packets
are dropped based on the drop probability. This behavior is the identical treatment a packet receives when WRED
is enabled without ECN congured on the router.
Related Commands
• wred-prole — creates a WRED prole and name that prole.
wred-prole
Create a WRED prole and name the prole.
S3048–ON
Syntax
wred-profile wred-profile-name
To remove an existing WRED prole, use the no wred-profile command.
Parameters
wred-prole-name
Enter your WRED prole name in character format (32 character maximum). Or use one
of the pre-dened WRED prole names. You can congure up to 26 WRED proles plus
the ve pre-dened proles, for a total of 31 WRED proles.
Quality of Service (QoS) 1307