Solved: Re: QoS Policy-Map output does not match settings

sganpat · ‎10-16-2013

This is a bit long, so bear with me.

I have a strange issue, which I can't say if it is causing any problems. I've configured a hierarchical QoS policy on the hub router of our network. It has a WAN speed of 20Mbps, while the DR site has a speed of 10Mbps and the branches have speeds of either 1 or 2Mbps.

Here is a sample of the policy.

!

class-map match-all DRSITE

match access-group name DRSITE

class-map match-all BRANCH

match access-group name BRANCH

class-map match-any NETMAN_TRAFFIC

match ip dscp cs2 cs6

class-map match-any VOICE_BEARER_TRAFFIC

match ip dscp ef

class-map match-any VOICE_CONTROL_TRAFFIC

match ip dscp cs3 af31 cs5

class-map match-any BUSAPP-TRAFFIC

match access-group name BUSAPP-QOS

!

policy-map WAN_OUT_CHILD

class BUSAPP-TRAFFIC

bandwidth percent 20

class NETMAN_TRAFFIC

bandwidth percent 5

class VOICE_BEARER_TRAFFIC

priority percent 10

class VOICE_CONTROL_TRAFFIC

bandwidth percent 2

class class-default

fair-queue

random-detect

policy-map WAN_OUT_PARENT

class BRANCH

shape average 2000000

service-policy WAN_OUT_CHILD

class DRSITE

shape average 10000000

service-policy WAN_OUT_CHILD

!

interface FastEthernet0/2/1

description WAN

bandwidth 20000

ip address x.x.x.x y.y.y.y

service-policy output WAN_OUT_PARENT

!

When you view the policy-map on the WAN interface you get:

ROUTER#show policy-map interface FastEthernet0/2/1

FastEthernet0/2/1

Service-policy output: WAN_OUT_PARENT

Class-map: DRSITE (match-all)

83261031 packets, 84138264486 bytes

5 minute offered rate 7754000 bps, drop rate 16000 bps

Match: access-group name DRSITE

Queueing

queue limit 64 packets

(queue depth/total drops/no-buffer drops) 36/472741/0

(pkts output/bytes output) 82788293/83555450097

shape (average) cir 10000000, bc 40000, be 40000

target shape rate 10000000

Service-policy : WAN_OUT_CHILD

queue stats for all priority classes:

Queueing

queue limit 64 packets

(queue depth/total drops/no-buffer drops) 0/0/0

(pkts output/bytes output) 1173/86970

Class-map: BUSAPP-TRAFFIC (match-any)

61556822 packets, 71479804095 bytes

5 minute offered rate 6546000 bps, drop rate 8000 bps

Match: access-group name BUSAPP-QOS

52387297 packets, 63799641491 bytes

5 minute rate 6409000 bps

Queueing

queue limit 64 packets

(queue depth/total drops/no-buffer drops) 35/461117/0

(pkts output/bytes output) 61095709/70909930937

bandwidth 20% (444 kbps)

Class-map: NETMAN_TRAFFIC (match-any)

18114 packets, 1344512 bytes

5 minute offered rate 0 bps, drop rate 0 bps

Match: ip dscp cs2 (16) cs6 (48)

18114 packets, 1344512 bytes

5 minute rate 0 bps

Queueing

queue limit 64 packets

(queue depth/total drops/no-buffer drops) 0/0/0

(pkts output/bytes output) 18114/1344638

bandwidth 5% (111 kbps)

Class-map: VOICE_BEARER_TRAFFIC (match-any)

1173 packets, 86970 bytes

5 minute offered rate 4000 bps, drop rate 0 bps

Match: ip dscp ef (46)

1173 packets, 86970 bytes

5 minute rate 4000 bps

Priority: 10% (222 kbps), burst bytes 5550, b/w exceed drops: 0

Class-map: VOICE_CONTROL_TRAFFIC (match-any)

0 packets, 0 bytes

5 minute offered rate 0 bps, drop rate 0 bps

Match: ip dscp cs3 (24) af31 (26) cs5 (40)

0 packets, 0 bytes

5 minute rate 0 bps

Queueing

queue limit 64 packets

(queue depth/total drops/no-buffer drops) 0/0/0

(pkts output/bytes output) 0/0

bandwidth 2% (44 kbps)

Class-map: class-default (match-any)

21684921 packets, 12657028835 bytes

5 minute offered rate 1198000 bps, drop rate 6000 bps

Match: any

Queueing

queue limit 64 packets

(queue depth/total drops/no-buffer drops/flowdrops) 0/11624/0/0

(pkts output/bytes output) 21673297/12644087552

Fair-queue: per-flow queue limit 16

Exp-weight-constant: 9 (1/512)

Mean queue depth: 3 packets

class Transmitted Random drop Tail/Flow drop Minimum Maximum Mark

pkts/bytes pkts/bytes pkts/bytes thresh thresh prob

0 21673297/12644087552 8453/9243609 3171/3697674 20 40 1/10

1 0/0 0/0 0/0 22 40 1/10

2 0/0 0/0 0/0 24 40 1/10

3 0/0 0/0 0/0 26 40 1/10

4 0/0 0/0 0/0 28 40 1/10

5 0/0 0/0 0/0 30 40 1/10

6 0/0 0/0 0/0 32 40 1/10

7 0/0 0/0 0/0 34 40 1/10

Class-map: BRANCH (match-all)

1294528 packets, 631316533 bytes

5 minute offered rate 13000 bps, drop rate 0 bps

Match: access-group name BRANCH

Queueing

queue limit 64 packets

(queue depth/total drops/no-buffer drops) 0/369/0

(pkts output/bytes output) 1294159/630935778

shape (average) cir 2000000, bc 8000, be 8000

target shape rate 2000000

Service-policy : WAN_OUT_CHILD

queue stats for all priority classes:

queue limit 64 packets

(queue depth/total drops/no-buffer drops) 0/0/0

(pkts output/bytes output) 0/0

Class-map: BUSAPP-TRAFFIC (match-any)

515203 packets, 502176478 bytes

5 minute offered rate 5000 bps, drop rate 0 bps

Match: access-group name BUSAPP-QOS

45164 packets, 17853778 bytes

5 minute rate 3000 bps

Queueing

queue limit 64 packets

(queue depth/total drops/no-buffer drops) 0/298/0

(pkts output/bytes output) 514905/501880273

bandwidth 20% (400 kbps)

Class-map: NETMAN_TRAFFIC (match-any)

17768 packets, 1317256 bytes

5 minute offered rate 0 bps, drop rate 0 bps

Match: ip dscp cs2 (16) cs6 (48)

17768 packets, 1317256 bytes

5 minute rate 0 bps

Queueing

queue limit 64 packets

(queue depth/total drops/no-buffer drops) 0/0/0

(pkts output/bytes output) 17768/1317256

bandwidth 5% (100 kbps)

Class-map: VOICE_BEARER_TRAFFIC (match-any)

0 packets, 0 bytes

5 minute offered rate 0 bps, drop rate 0 bps

Match: ip dscp ef (46)

0 packets, 0 bytes

5 minute rate 0 bps

Priority: 10% (200 kbps), burst bytes 5000, b/w exceed drops: 0

Class-map: VOICE_CONTROL_TRAFFIC (match-any)

0 packets, 0 bytes

5 minute offered rate 0 bps, drop rate 0 bps

Match: ip dscp cs3 (24) af31 (26) cs5 (40)

0 packets, 0 bytes

5 minute rate 0 bps

Queueing

queue limit 64 packets

(queue depth/total drops/no-buffer drops) 0/0/0

(pkts output/bytes output) 0/0

bandwidth 2% (40 kbps)

Class-map: class-default (match-any)

761557 packets, 127822799 bytes

5 minute offered rate 5000 bps, drop rate 0 bps

Match: any

Queueing

queue limit 64 packets

(queue depth/total drops/no-buffer drops/flowdrops) 0/71/0/0

(pkts output/bytes output) 761486/127738249

Fair-queue: per-flow queue limit 16

Exp-weight-constant: 9 (1/512)

Mean queue depth: 0 packets

class Transmitted Random drop Tail/Flow drop Minimum Maximum Mark

pkts/bytes pkts/bytes pkts/bytes thresh thresh prob

0 761486/127738249 71/84550 0/0 20 40 1/10

1 0/0 0/0 0/0 22 40 1/10

2 0/0 0/0 0/0 24 40 1/10

3 0/0 0/0 0/0 26 40 1/10

4 0/0 0/0 0/0 28 40 1/10

5 0/0 0/0 0/0 30 40 1/10

6 0/0 0/0 0/0 32 40 1/10

7 0/0 0/0 0/0 34 40 1/10

You can see that the bandwidth value of the BRANCH policy (shown in blue) shows the correct value with respect to the target shape rate. For example, 20% of 2Mbps is 400kbps.

However, the bandwidth value of the DRSITE policy (shown in red) shows the incorrect value. The target shap rate is 10Mbps, so 20% should be 2000kbps. Instead it shows as 444kbps.

Why is this so? And is this a problem?

Sachin

John Blakley · ‎10-17-2013

Sachin,

We just ran into this. It seems that the post-HQF IOS > 12.4(20)T doesn't calculate the bandwidth correctly (I should say it calculates differently) unless you put the bandwidth statement under the default class. Try adding "bandwidth 10000" and "bandwidth 2000" under the class default and leave the shaper and service policy commands. I'd be curious to see if you get the correct calculations like we did when Cisco did this. At first I thought it was a hack, but it has to do with the way Cisco changed up qos.

class DRSITE

shape average 10000000

bandwidth 10000

service-policy WAN_OUT_CHILD

Also, I was looking at your Branches policy and it looks correct. You have 2Mb shaped...should it be 20?

HTH,
John

*** Please rate all useful posts ***

HTH, John *** Please rate all useful posts ***

View solution in original post

John Blakley · ‎10-17-2013

Sachin,

We just ran into this. It seems that the post-HQF IOS > 12.4(20)T doesn't calculate the bandwidth correctly (I should say it calculates differently) unless you put the bandwidth statement under the default class. Try adding "bandwidth 10000" and "bandwidth 2000" under the class default and leave the shaper and service policy commands. I'd be curious to see if you get the correct calculations like we did when Cisco did this. At first I thought it was a hack, but it has to do with the way Cisco changed up qos.

class DRSITE

shape average 10000000

bandwidth 10000

service-policy WAN_OUT_CHILD

Also, I was looking at your Branches policy and it looks correct. You have 2Mb shaped...should it be 20?

HTH,
John

*** Please rate all useful posts ***

HTH, John *** Please rate all useful posts ***

sganpat · ‎10-17-2013

Thanks John. That worked nicely. Needed to tweak my policies a bit, but now it's reporting to correct values.

And the branches are shaped to 2Mbps.

Sachin

Kelvin Willacey · ‎10-22-2013

I know this is already solved but after reading this post I checked one of my hub routers out of curiosity and it had the same behavior and adding the bandwidth command fixed the issue. However it only affected one of the classes under the parent policy, all the others were calculated just fine. Does anyone know why it only affects some classes and not all?