Hi,
  Your guess is corect only. We want to implement RFD where process doesn't
have FPU.

Regards,
Sakthi

-----Original Message-----
From: E.B. Dreger [mailto:eddy+public+spam@...Sent: Thursday, 10 April 2003 11:57 AM
To: isp-bgp@isp-bgp.com
Subject: [isp-bgp] Re: Route Flap Damping


S> Date: Thu, 10 Apr 2003 11:45:21 +0530
S> From: Sakthivadivu.S.S


S> Is it possible to implement Route Flap Damping using integer
S> arithmetic?.If anybody has implemented this, please give me
S> the solution.

This question confuses me.  Are you hinting at implementing BGP
for a processor that lacks FPU?  If so, the answer is "yes, but
it might take a bit of work".

Due to the exponential decay nature of flap dampening, you'd
probably want to add/subtract/multiply the logarithms of your
intended quantities rather than the numbers themselves.

For instance,

	log (A * B) = (log A) + (log B)
	log (A ^ B) = B * (log A)

come in handy.

Off the top of my head, I'd probably work in base 2 log using a
combination of fixed-point arithmetic, lookup tables, and
iterative routines.

Or am I way off in guessing what you want to do?


Eddy
--
Brotsman & Dreger, Inc. - EverQuick Internet Division
Bandwidth, consulting, e-commerce, hosting, and network building
Phone: +1 (785) 865-5885 Lawrence and [inter]national
Phone: +1 (316) 794-8922 Wichita

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Replies

[isp-bgp] Re: Route Flap Damping, E.B. Dreger