Users Guide

3 Attach the policy-map to the interface.
Dell Networking OS support dierent types of match qualiers to classify the incoming trac.
Match qualiers can be directly congured in the class-map command or it can be specied through one or more ACL which in turn
species the combination of match qualiers.
Until Release 9.3(0.0), support is available for classifying trac based on the 6-bit DSCP eld of the IPv4 packet.
As a part of this feature, the 2-bit ECN eld of the IPv4 packet will also be available to be congured as one of the match qualier. This way
the entire 8-bit ToS eld of the IPv4 header shall be used to classify trac.
The Dell Networking OS Release 9.3(0.0) supports the following QOS actions in the ingress policy based QOS:
1 Rate Policing
2 Queuing
3 Marking
For the L3 Routed packets, the DSCP marking is the only marking action supported in the software. As a part of this feature, the additional
marking action to set the “color” of the trac will be provided.
Until Release 9.3(0.0), the software has the capability to qualify only on the 6-bit DSCP part of the ToS eld in IPv4 Header. You can now
accept and process incoming packets based on the 2-bit ECN part of the ToS eld in addition to the DSCP categorization. The IPv4 ACLs
(standard and Extended) are enhanced to add this qualier. This new keyword ‘ecn’ is present for all L3 ACL types (TCP/UDP/IP/ICMP) at
the level where the ‘DSCP’ qualier is positioned in the current ACL commands.
Dell Networking OS supports the capability to contain DSCP and ECN classiers simultaneously for the same ACL entry.
You can use the ecn keyword with the ip access-list standard, ip access-list extended, seq, and permit commands for standard and
extended IPv4 ACLs to match incoming packets with the specied ECN values.
Similar to ‘dscp’ qualier in the existing L3 ACL command, the ‘ecn’ qualier can be used along with all other supported ACL match
qualiers such as SIP/DIP/TCP/UDP/SRC PORT/DST PORT/ ICMP.
Until Release 9.3(0.0), ACL supports classication based on the below TCP ags:
• ACK
• FIN
• SYN
• PSH
• RST
• URG
You can now use the ‘ecn’ match qualier along with the above TCP ag for classication.
The following combination of match qualiers is acceptable to be congured for the Dell Networking OS software through L3 ACL
command:
• Classication based on DSCP only
• Classication based on ECN only
• Classication 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 trac as ‘yellow’ would
be added in the ‘match ip’ sequence of the class-map conguration.
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Quality of Service (QoS)