Aggressive route flap dampening

[michael () priori net]

Can aggressive route flap dampening replace the need for /19 prefix filtering?
For instance, could the old Class C space be filtered on the /24 boundary
if this sort of flap dampening was put in place? Here is Paul Ferguson's
comments from the pagan mailing list:

> Again, I mention the fact that aggressive route-flap dampening
> could be used in the place of prefix length traffic filters, but
> someone/something needs to educate the latter group to implement
> a less draconian method of protecting themselves from misbehaving
> announcements. If I am not remiss, the predominate reasoning for
> filtering on /19's and longer was an assumption that smaller
> announcements were responsible for the majority of the routing
> instability, and that simply blocking these announcements at
> an arbitrary prefix length would be the simplest way to 'fix'
> the problem. This may be true, but an alternate method of
> approach for this problem could solve all of this squabbling
> once and for all, at least in regard to this issue.

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Michael Dillon                    voice: +1-415-482-2840
Senior Systems Architect            fax: +1-415-482-2844
PRIORI NETWORKS, INC.              http://www.priori.net

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