Dell S4048-ON, Configuration Manual

Page: 706 / 1039

– SYN
– PSH
– RST
– URG
In the existing software, ECE/CWR TCP flag qualifiers are not supported.
• Because this functionality forcibly marks all the packets matching the specific match criteria as ‘yellow’, Dell Networking OS does
not support Policer based coloring and this feature concurrently.
• If single rate two color policer is configured along with this feature, then by default all packets less than PIR would be considered
as “Green” But ‘Green’ packets matching the specific match criteria for which ‘color-marking’ is configured will be over-written
and marked as “Yellow”.
• If two rate three color policer is configured along with this feature then,
– x < CIR – will be marked as “Green”
– CIR < x< PIR – will be marked as “Yellow”
– PIR < x – will be marked as “Red”
But ‘Green’ packets matching the specific match criteria for which ‘color-marking’ is configured will be over-written and marked as
“Yellow”.
Sample configuration to mark non-ecn packets as “yellow” with
Multiple traffic class
Consider the example where there are no different traffic classes that is all the packets are egressing on the default ‘queue0’.
Dell Networking OS can be configured as below to mark the non-ecn packets as yellow packets.
!
ip access-list standard ecn_0
seq 5 permit any ecn 0
class-map match-any ecn_0_cmap
match ip access-group ecn_0 set-color yellow
!
policy-map-input ecn_0_pmap
service-queue 0 class-map ecn_0_cmap
Applying this policy-map “ecn_0_pmap” will mark all the packets with ‘ecn == 0’ as yellow packets on queue0 (default queue).
Sample configuration to mark non-ecn packets as “yellow” with single
traffic class
Consider the use case where the packet with DSCP value “40” need to be enqueued in queue#2 and packets with DSCP value as
50 need to be enqueued in queue#3. And all the packets with ecn value as ‘0’ must be marked as ‘yellow’.
The above requirement can be achieved using either of the two approaches.
The above requirement can be achieved using either of the two approaches.
Approach without explicit ECN match qualifiers for ECN packets:
!
ip access-list standard dscp_50
seq 5 permit any dscp 50
!
ip access-list standard dscp_40
seq 5 permit any dscp 40
!
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Quality of Service (QoS)