BGP Route Damping
templin at urdirect.net
Tue Nov 13 18:09:04 UTC 2001
On Tue, 13 Nov 2001, German Martinez wrote:
> Perhaps this document was already discussed (I'm new in this list). If it
> was please let me know. Basically, I wanted to get an opinion from US
> based ISP about this document.
> Does somebody know how Tier-1 networks implement route damping ?
> Here is the document:
I can't speak for any large networks, but I will say that you need to
adjust a portion of that configuration to actually achieve dampening of
/24s and longer. In:
route-map graded-flap-damping permit 20
match ip address prefix-list min24
set damp 30 750 3000 60
you will need to change the numbers in the final line, as there is a
fundamental equation that needs to be followed:
2x(max-suppress/half-life) must be greater than (suppress/reuse).
So you'll need to increase either the max-suppress (60) or the reuse
(60), or decrease the half-life (30) or the suppress (750).
Peter J. Templin, Jr., CCNP, CCDP
On-Line Internet Services - URDirect.net
A division of Global On-Line Computers
5606 Randolph Blvd templin at urdirect.net
San Antonio, TX 78233 (210)477-7603
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