frame-relay traffic shaping

From: Rado Vasilev (decklandv@gmail.com)
Date: Thu Jul 17 2008 - 13:08:35 ART

Hi Group,

I'd appreciate if someone sheds some light on this one...
Task is to shape a FR rate to 10mbit/s. BECN notifications should bring
the rate down to 7.5mbit/s. In case the router has accumlated credit,
it's allowed to burst to the physical capacity of 45mbit/s on the port.
use an interval of 50ms.

My solution:

map-class frame-relay SE10
 frame-relay cir 10000000 ---> 10mbit/s commint
 frame-relay bc 500000 ---> calcuated as the CIR / 20 (as
there's 20 intervals of 50ms in a second)
 frame-relay be 1750000 ---> burts calucalated as; physical
capacity of 45mbit/s - 10mbit/s commit = 35mbit/s; 35mbit/s divided by
20 (20 intervals of 50ms within a second)
 frame-relay mincir 7500000 ---> this will be used if BECN frames are
received
 frame-relay adaptive-shaping becn

interface Serial1/0
 bandwidth 45000
frame-relay map ip 54.1.1.254 101 broadcast
 frame-relay interface-dlci 101
  class SE10

My problem is when I check the result with:

Rack1R6#sh traffic-shape se 1/0

Interface Se1/0
       Access Target Byte Sustain Excess Interval Increment Adapt
VC List Rate Limit bits/int bits/int (ms) (bytes)
Active
51 56000 875 7000 0 125 875 -
100 56000 875 7000 0 125 875 -
201 56000 875 7000 0 125 875 -
301 56000 875 7000 0 125 875 -
401 56000 875 7000 0 125 875 -
101 10000000 234375 500000 1750000 13 16250 BECN

Shouldn't i get a result interval of 50 and not 13ms as in the above output?

Thanks for your help!
Rado

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