Similar to ‘dscp’ qualier in the existing L3 ACL command, the ‘ecn’ qualier can be used along with all other supported ACL match
qualiers such as SIP/DIP/TCP/UDP/SRC PORT/DST PORT/ ICMP.
Until Release 9.3(0.0), ACL supports classication based on the below TCP ags:
• ACK
• FIN
• SYN
• PSH
• RST
• URG
You can now use the ‘ecn’ match qualier along with the above TCP ag for classication.
The following combination of match qualiers is acceptable to be congured for the Dell Networking OS software through L3 ACL
command:
• Classication based on DSCP only
• Classication based on ECN only
• Classication 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 trac as ‘yellow’ would
be added in the ‘match ip’ sequence of the class-map conguration.
By default, all packets are considered as ‘green’ (without the rate-policer and trust-diserve conguration) 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 specied 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 congured for all of the below L3 match sequence types:
• match ip access-group
• match ip dscp
• match ip precedence
• match ip vlan
Guidelines for Conguring ECN for Classifying and
Color-Marking Packets
Keep the following points in mind while conguring the marking and mapping of incoming packets using ECN elds in IPv4 headers:
• Currently Dell Networking OS supports matching only the following TCP ags:
• ACK
666
Quality of Service (QoS)
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