From: Stanislav Sinyagin (SSinyagin@xxxxxx)
Date: Sun Dec 05 1999 - 16:41:30 GMT-3
Usually cir, bc and be are set by frame-relay network provider, and
it's up to you to use it or not. If you're not using it, then your
router sends the data at wire speed, and the nerest FR switch adapts
your traffic to the contract values (and drops the packets if they
don't fit into your cir/bc/be and overflow its queues)
If you set traffic-shaping on your FR interface, then your router
sends the data according to configured cir/bc/be values.
for example, if you have a 64kbps serial interface, and configure a
PVC with cir=32000, be=0, bc=0, then your outgoing traffic in this PVC
will always be within 32kbps. Cisco's bc and be implementation is such
that setting bc and be above zero doesn't give you too much. Only peak
traffic for a short period of time can go at above CIR speed. This is
not in Cisco docs, this is what a Cisco ingeneer told me once.
For better understanding, there are some books not related to Cisco at
all ('cause Cisco is not very specialized on FR switches). But I never
heard FR traffic shaping is covered in the lab exam. Though the things
tend to change too rapidly.
Stan
Jason Chen <jchenk@online.sh.cn> wrote:
JC> Hi, all
JC> How can I calculate these parameters: be, bc, cir & average rate ,peak rate
JC> in frame-relay traffic-shaping.
JC> Can I find some examples in cco open-forum?
JC> TIA
JC> Jason Chen
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