CCIE Pursuit Blog

March 17, 2008

Internetwork Expert Volume II: Lab 8 – Section 2

Frame Relay – 9 Points

2.1 Hub-and-Spoke

Easy

2.2 Multilink PPP over Frame-Relay

This is the first PPP multilink over FR task I’ve encountered.  Luckily this is a technology that I use on the job so this was fairly easy.

2.3 Point-to-Point

Easy.  Because we’re using Frame inarp, just need to explicitly turn it off for the other PVCs.

I wasted a ton of time trying to reverse engineer the DLCIs on the CCOnlinelabs equipment.  DLCIs 100 and 62 (the DLCI that they supposed use) do not exist.

I finally had to strip the entire BB1 config off and then just turn on FR with an IP address on s0/0 and do the same on r6.  Frame inarp did it’s magic and you can see the results:

r6:
Serial0/0/0 (up): ip 54.1.2.254 dlci 629(0x275,0x9C50), dynamic,
              broadcast,
              CISCO, status defined, active

bb1:
Serial0/0 (up): ip 54.1.2.6 dlci 926(0x39E,0xE4E0), dynamic,
              broadcast,
              CISCO, status defined, active

So….I have DLCI 629 on r6 with 926 on bb1.  I’ve used CCOnlinelabs before and never had an issue like this.  My guess is that that the pod was set up for another vendor’s workbook.

2.4 Frame Relay Traffic Shaping

This seemed to be a very easy FRTS task. 

Bc = CIR * Tc/1000

Bc = 128000 * 125/1000
Bc = CIR * .125
BC = 16000

Without Bc configured:

r5#sh traffic | i Inter|Acc|VC|501
Interface   Se0/0/0
       Access Target    Byte   Sustain   Excess    Interval  Increment Adapt
VC     List   Rate      Limit  bits/int  bits/int  (ms)      (bytes)   Active
501           128000    2000   128000    0         125       2000      –

With Bc set to 16000:

r5#sh traffic | i Inter|Acc|VC|501
Interface   Se0/0/0
       Access Target    Byte   Sustain   Excess    Interval  Increment Adapt
VC     List   Rate      Limit  bits/int  bits/int  (ms)      (bytes)   Active
501           128000    2000   16000     0         125       2000      –

IE guide says to see explanation for FRTS task in lab 1.

I’ll have to review to find out why we needed to explicitly set the Bc.

Task 2.4

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2 Comments »

  1. I need to discuss something regarding a task in lab 9.
    Of course after you complete lab 9, shich should be today.
    Would it be alright ?

    Comment by Barooq — March 18, 2008 @ 4:00 am | Reply

  2. FRTS has strange habit show Bc value per second, not per interval, if Bc is not defined. This is cosmetic bug.

    Comment by Unknown — March 19, 2008 @ 7:47 am | Reply


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