Concept Guide

20419 1 10 0 0x0 0 0 0.0.0.0/0 0.0.0.0/0 14 1
24511 1 0 0 0x0 0 0 0.0.0.0/0 0.0.0.0/0 - 0
DellEMC#show cam layer3-qos interface twe 1/5
Cam Port Dscp Proto Tcp Src Dst SrcIp DstIp DSCP Queue
Index Flag Port Port Marking
-------------------------------------------------------------------------
20416 1 18 IP 0x0 0 0 23.64.0.5/32 0.0.0.0/0 20 2
20417 1 0 IP 0x0 0 0 23.64.0.2/32 0.0.0.0/0 10 1
20418 1 0 IP 0x0 0 0 23.64.0.3/32 0.0.0.0/0 12 1
20419 1 10 0 0x0 0 0 0.0.0.0/0 0.0.0.0/0 14 1
24511 1 0 0 0x0 0 0 0.0.0.0/0 0.0.0.0/0 - 0
Dot1p to Queue Mapping Requirement
The dot1p to queue mapping on the system is global and this is used to congure the PRIO2COS table conguration. For DSCP based PFC
feature on untagged packets, this mapping must be the same as the default dot1p to queue mapping and should not be changed (as in
TABLE 1). If a custom dot1p to queue mapping is present it should be recongured to the default dot1p to queue mapping.
• Currently Dell EMC Networking OS supports matching only the following TCP ags:
– ACK
– FIN
– SYN
– PSH
– RST
– URG
In the existing software, ECE/CWR TCP ag qualiers are not supported.
• Because this functionality forcibly marks all the packets matching the specic match criteria as ‘yellow’, Dell EMC Networking OS does
not support Policer based coloring and this feature concurrently.
• If single rate two color policer is congured along with this feature, then by default all packets less than PIR would be considered as
“Green” But ‘Green’ packets matching the specic match criteria for which ‘color-marking’ is congured will be over-written and
marked as “Yellow”.
• If two rate three color policer is congured 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 specic match criteria for which ‘color-marking’ is congured will be over-written and marked as “Yellow”.
Create a QoS Policy
There are two types of QoS policies — input and output.
Input QoS policies regulate Layer 3 and Layer 2 ingress trac. The regulation mechanisms for input QoS policies are rate policing and
setting priority values.
• Layer 3 — QoS input policies allow you to rate police and set a DSCP or dot1p value. In addition, you can congure a drop precedence
for incoming packets based on their DSCP value by using a DSCP color map. For more information, see DSCP Color Maps.
• Layer 2 — QoS input policies allow you to rate police and set a dot1p value.
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Quality of Service (QoS)