FRTS Question - IEWB Lab8 Task7.1

Hi Guys i have a question related to Traffic shaping -

The task asks this -
Configure Frame Relay Traffic Shaping
- port speed of 45Mbps.
- DLCI 101 has a provisioned rate of 15Mbps.
- In the case that R6 has accumulated credit it should be allowed to
burst up to its port speed.
- Use an interval of 50ms.
- Do not use the frame-relay traffic-shaping command to accomplish this.

Solution as per the solution guide -

policy-map FRTS
class class-default
shape average 15000000 750000 1500000
!
interface Serial0/0/0
bandwidth 45000
frame-relay interface-dlci 101
service-policy output FRTS

My question -

question1) shoudn't the excess burst be calculated based on port speed
of 45Mbps with Tc=50ms which gives Be=2250000 (45000000*50/1000)
So instead of Be=1500000 which is equates to a burst speed of 30Mbps,
Be should be 2250000 which yields 45Mbps.

question2) What if instead of using class-default, a class with "match
fr-dlci 101" be used and applied globally on the interface? this way -

class CLASS_DLC101
match fr-dlci 101

policy-map FRTS
class CLASS_DLC101
shape average 15000000 750000 2250000
!
interface Serial0/0/0
bandwidth 45000
service-policy output FRTS

Any thoughts ?

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Received on Thu Apr 15 2010 - 17:33:10 ART