Problem in applying QOS on PRI channel Group

Answered Question
Sep 6th, 2007

HI,

I am having a WAN connection between 2 sites A&B. ON A side we are using a private/leased line of 768k and on B side we are using 12 channels of a PRI line.

When I am applying QOS on the A side eveything is fine and in the the output of command "sh int s0/0" it is showing available bandwidth is equal to 75% of 768K.

But on B side when i have applied Qos it is showing me the available bandwidth is 3kb.

After removing QOS on the channel-group int it is showing me 768k of avaible bandwidth in "sh int s1/0:1".

I have attached all the outputs in the attachment.

Waiting for the replies.

Regards

Mahi

Attachment: 
I have this problem too.
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Correct Answer by mheusing about 9 years 3 months ago

Hi Mahi,

The attached policy is

policy-map mahi

class QPM_Q6

bandwidth percent 4

random-detect

class QPM_Q5_1

priority 230

class QPM_Q3

bandwidth percent 35

random-detect

class QPM_Q1

bandwidth percent 1

random-detect

class class-default

bandwidth percent 30

random-detect

The formula to consider is:

Available Bandwidth = max-reserv x interface bandwidth - allocated bandwidth

In your case:

interface bandwidth = 768 kb

max-reserv = 100%

allocated bandwidth = 230 kbps + 30 kbps (4%) + 268 kbps (35%) + 7 kb (1%) + 230 kbps (30%) = 765 kbps

Thus remaining bandwidth is 3 kbps. Nothing wrong with it. Router can do the math.

Regards, Martin

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Correct Answer
mheusing Thu, 09/06/2007 - 07:36

Hi Mahi,

The attached policy is

policy-map mahi

class QPM_Q6

bandwidth percent 4

random-detect

class QPM_Q5_1

priority 230

class QPM_Q3

bandwidth percent 35

random-detect

class QPM_Q1

bandwidth percent 1

random-detect

class class-default

bandwidth percent 30

random-detect

The formula to consider is:

Available Bandwidth = max-reserv x interface bandwidth - allocated bandwidth

In your case:

interface bandwidth = 768 kb

max-reserv = 100%

allocated bandwidth = 230 kbps + 30 kbps (4%) + 268 kbps (35%) + 7 kb (1%) + 230 kbps (30%) = 765 kbps

Thus remaining bandwidth is 3 kbps. Nothing wrong with it. Router can do the math.

Regards, Martin

mohindersingh Thu, 09/06/2007 - 08:13

Hi Martin,

We are using same kind of QOS policy on other channel group interfcae also. ALL interfaces are configured with "max-reserved bandwidth command" as well as 100% distribution of bandwidth in QOS classes but they are showing half of the bandwidth as avaible bandwidth.

Can you clarify my doubt.

Thanks for ur reply.

Regards

Mahi

mheusing Thu, 09/06/2007 - 23:01

Hi Mahi,

Can you provide the configs and respective show command output? Without this it is hard to state anything.

Regards, Martin

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