Can someone expalin what this QoS map tables mean. Is it important to understand what they mean or are they auto generated by just turning QoS on on the switch/router. How do you read them? What do the d1 and d2 represent? I thought DSCP valuse range from 0 - 63. If that's the case, on the DSCP-COS map whay are the numbers onlt going from 0-7. I can understand why the Cos-dscp map make sense since the numbers from 0 - 56 are represented in the DSCP values. It confusing how the maping values change on
1.
Dscp-cos map:
d1 : d2 0 1 2 3 4 5 6 7 8 9
--------------------------
----------
---
0 : 00 00 00 00 00 00 00 00 01 01
1 : 01 01 01 01 01 01 02 02 02 02
2 : 02 02 02 02 03 03 03 03 03 03
3 : 03 03 04 04 04 04 04 04 04 04
4 : 05 05 05 05 05 05 05 05 06 06
5 : 06 06 06 06 06 06 07 07 07 07
6 : 07 07 07 07
2.
Dscp-switch priority map:
d1 : d2 0 1 2 3 4 5 6 7 8 9
--------------------------
----------
---
0 : 00 00 00 00 00 00 00 00 00 00
1 : 00 00 00 00 00 00 01 01 01 01
2 : 01 01 01 01 01 01 01 01 01 01
3 : 01 01 02 02 02 02 02 02 02 02
4 : 02 02 02 02 02 02 02 02 03 03
5 : 03 03 03 03 03 03 03 03 03 03
6 : 03 03 03 03
3.
scp-dscp mutation map:
Default DSCP Mutation Map:
d1 : d2 0 1 2 3 4 5 6 7 8 9
--------------------------
----------
---
0 : 00 01 02 03 04 05 06 07 08 09
1 : 10 11 12 13 14 15 16 17 18 19
2 : 20 21 22 23 24 25 26 27 28 29
3 : 30 31 32 33 34 35 36 37 38 39
4 : 40 41 42 43 44 45 46 47 48 49
5 : 50 51 52 53 54 55 56 57 58 59
6 : 60 61 62 63
I have all the notes that I can read, but none expalins how to read these and why they change like that. This subject is kicking me in the gut. Help.!!!.. -:)
The terms ingress and egress are confusing as well
for example, when I run the command
# sh mls qos interface statistics
I get this---
GigabitEthernet0/2
Ingress
dscp: incoming no_change classified policed dropped (in bytes)
Others: 2005512940 1999692272 5820668 0 0
Egress
dscp: incoming no_change classified policed dropped (in bytes)
Others: 3781506923 n/a n/a 0 0
Why on Egress there is ingress, I can understand Ingress and Incoming
Explain the ingress and egress on the same port especially when you have to assign DSCP or CoS values
Can someone help. Like I mentioned, none of the books or white papers explain. They just dive into the details of QoS. IIt's difficult to move forward before I understand these basics and hoping someone cn help.
