Re: iewb v4.1 lab 9 task 7.1 FRTS

From: jan vdb (jvdbro@yahoo.com)
Date: Tue Sep 25 2007 - 12:05:13 ART

Hey Joseph,

Must the shaping command not be SHAPE PEAK instead of shape
average?

Then we have a target rate of 7,5Mbps
Traffic Shaping
Target/Average Byte Sustain Excess Interval Increment
Rate Limit bits/int bits/int (ms) (bytes)
7500000/5000000 30000 160000 80000 32 20000

The solution in
the book was indeed shape average but how can we have this excess burst then??
Or am I missing something?
 

----- Original Message ----
From: Joseph Brunner
<joe@affirmedsystems.com>
To: slevin kremera <slevin.kremera@gmail.com>; Cisco
certification <ccielab@groupstudy.com>
Sent: Tuesday, September 25, 2007
3:14:59 AM
Subject: RE: iewb v4.1 lab 9 task 7.1 FRTS

Let's look at the
numbers first as given to us by the task

AR = 7,500,000 bits per second
CIR =
5,000,000 bits per second
Tc = 32 ms
Be = AR-CIR = 2,500,000

So if we divide
1000ms / tc (32ms) we are given 31.25, now we just need to
divide our cir by
31.25 to find our "bits per interval, sustained"

So guess what?

5,000,000 /
31.25 = 160,000 (WHAT WE CAN SEND SUSTAINED PER TC)

So now let's find our
"bits per interval, excess" (BE)

AR-CIR = 2,500,000 / 31.25 = 80000

So the
command under class class-default is

shape average 5000000 160000 80000

And
we verify with... (look at the "interval")

rack1r2#sh policy-map int s0/0
Serial0/0

  Service-policy output: FRPOLICY

    Class-map: class-default
(match-any)
      2 packets, 148 bytes
      5 minute offered rate 0 bps, drop
rate 0 bps
      Match: any
      Traffic Shaping
           Target/Average
Byte Sustain Excess Interval Increment
             Rate
Limit bits/int bits/int (ms) (bytes)
          5000000/5000000
30000 160000 80000 32 20000

        Adapt Queue
Packets Bytes Packets Bytes Shaping
        Active Depth
Delayed Delayed Active
        - 0 2 148 0
0 no

-----Original Message-----
From: nobody@groupstudy.com
[mailto:nobody@groupstudy.com] On Behalf Of
slevin kremera
Sent: Monday,
September 24, 2007 8:16 PM
To: Cisco certification
Subject: iewb v4.1 lab 9
task 7.1 FRTS

can some one explain how did he get the burst value of 160000

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