Guidelines For Configuring Ecn For Classifying And Color-Marking Packets - Dell S4048–ON Configuration Manual

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Similar to 'dscp' qualifier in the existing L3 ACL command, the 'ecn' qualifier can be used along with all other supported ACL match

qualifiers such as SIP/DIP/TCP/UDP/SRC PORT/DST PORT/ ICMP.

Until Release 9.3(0.0), ACL supports classification based on the below TCP flags:

You can now use the 'ecn' match qualifier along with the above TCP flag for classification.

The following combination of match qualifiers is acceptable to be configured for the Dell Networking OS software through L3 ACL

Classification based on DSCP only

Classification based on ECN only

Classification based on ECN and DSCP concurrently

You can now use the set-color yellow keyword with the match ip access-group command to mark the color of the traffic as 'yellow' would

be added in the 'match ip' sequence of the class-map configuration.

By default, all packets are considered as 'green' (without the rate-policer and trust-diffserve configuration) and hence support would be

provided to mark the packets as 'yellow' alone will be provided.

By default Dell Networking OS drops all the 'RED' or 'violate' packets.

The following combination of marking actions to be specified match sequence of the class-map command:

set a new DSCP for the packet

set the packet color as 'yellow'

set the packet color as 'yellow' and set a new DSCP for the packet

This marking action to set the color of the packet is allowed only on the 'match-any' logical operator of the class-map.

This marking-action can be configured for all of the below L3 match sequence types:

match ip access-group

match ip dscp

match ip precedence

match ip vlan

Guidelines for Configuring ECN for Classifying and

Color-Marking Packets

Keep the following points in mind while configuring the marking and mapping of incoming packets using ECN fields in IPv4 headers:

Currently Dell Networking OS supports matching only the following TCP flags:

Quality of Service (QoS)

Troubleshooting