Dscp Color Map Commands - Dell S6000 Reference Manual

Command line for the system

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By default, ECN marking is disabled on all queues.

CONFIGURATION mode

Version 9.3.0.0

You can add or remove ECN marking configuration on a list of queues on all

backplane ports. All of the configured attributes apply to all the backplane ports

and are for each queue. You can configure all the data queues. For Z9000, you can

configure queues 0-3. By default, ECN marking is disabled on all queues. 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:

Dellconf) #service-class wred ecn 0,3-5,7 backplane

DSCP Color Map Commands

The DSCP color map allows you to set the number of specific DSCP values to yellow or red. Traffic

marked as yellow delivers traffic to the egress queue which will either transmit the packet if it has

available bandwidth or drop the packet due to no ability to send. Traffic marked as red (high drop

precedence) is dropped.

Sets the number of specific DSCP values for a color map profile to yellow or red.

dscp {yellow | red} [list-dscp-values]

To remove a color policy map profile, use the no dscp {yellow | red}

[dscp-list] command.

Quality of Service (QoS)

Introduced on the S6000 and Z9000 platforms

If the transmission endpoints are ECN-capable and traffic 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 configured 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 configured on the router.