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C3750e dropped AF41 traffic in ingress interface

Hi all,

As above, I got a problem with C3750e, ios c3750e-universalk9-mz.122-58.SE1.bin, when send AF41 traffic passing through it. My topolygy is as following

WAN link <----------> G0/0/2.100 - ASR1002 - G0/0/5 <---------> G1/0/1 - C3750e - G1/0/3 <--------> G0/0/1 - ASR1004

On this C3750e, I turned on mls qos, trust dscp on both G1/0/1 and G1/0/3 and no else is configured. ASR1002 G0/0/2.100, i applied the CB shaping fror AF41 traffic.

C3750e#sh mls qos

QoS is enabled

QoS ip packet dscp rewrite is enabled

C3750e#sh mls qos int g1/0/3

GigabitEthernet1/0/3

trust state: trust dscp

trust mode: trust dscp

trust enabled flag: ena

COS override: dis

default COS: 0

DSCP Mutation Map: Default DSCP Mutation Map

Trust device: none

qos mode: port-based

C3750e#sh mls qos int g1/0/1

GigabitEthernet1/0/1

trust state: trust dscp

trust mode: trust dscp

trust enabled flag: ena

COS override: dis

default COS: 0

DSCP Mutation Map: Default DSCP Mutation Map

Trust device: none

qos mode: port-based

C3750e#sh mls qos maps dscp-input-q 

   Dscp-inputq-threshold map:

     d1 :d2    0     1     2     3     4     5     6     7     8     9

     ------------------------------------------------------------

      0 :    01-01 01-01 01-01 01-01 01-01 01-01 01-01 01-01 01-01 01-01

      1 :    01-01 01-01 01-01 01-01 01-01 01-01 01-01 01-01 01-01 01-01

      2 :    01-01 01-01 01-01 01-01 01-01 01-01 01-01 01-01 01-01 01-01

      3 :    01-01 01-01 01-01 01-01 01-01 01-01 01-01 01-01 01-01 01-01

      4 :    02-01 02-01 02-01 02-01 02-01 02-01 02-01 02-01 01-01 01-01

      5 :    01-01 01-01 01-01 01-01 01-01 01-01 01-01 01-01 01-01 01-01

      6 :    01-01 01-01 01-01 01-01

C3750e#sh mls qos int g1/0/3 queueing

GigabitEthernet1/0/3

Egress Priority Queue : disabled

Shaped queue weights (absolute) :  25 0 0 0

Shared queue weights  :  25 25 25 25

The port bandwidth limit : 100  (Operational Bandwidth:100.0)

The port is mapped to qset : 1

C3750e#sh mls qos map dscp-mutation

   Dscp-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

Then, from ASR1004, i send ICMP traffic with TOS set to AF41 (136) and i found out that

1. The traffic is dropped on c3750e

sh mls qos int g1/0/3 statistics

GigabitEthernet1/0/3 (All statistics are in packets)

30 - 34 :          63           63           48           86         1534 

2. The traffic never get hit into AF41 class in ASR1002

May I seek for Guru's advise why C3750e dropped this AF41 traffic? and what can I do to fix it?

Appreciate your prompt advice

1 REPLY
Cisco Employee

C3750e dropped AF41 traffic in ingress interface

Hello Nhat,

Have you confirmed drops are seen in q4 (dscp 34)?

Can you send me the complete output of sh mls qos int g1/0/3 statistics, maybe two or three instances?

Fabienne

TAC

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