All things related to multicast

[Pekka Savola <>]

On Thu, 21 Feb 2008, Simon Lockhart wrote:
> On Thu Feb 21, 2008 at 03:09:23PM -0500, Alan Crosswell wrote:
> > There still is the rate-limiting issue.  If someone DoSes SAP, then if
> > you rate limit, odds are you will lose the good announcements and SAP
> > will become useless.
>
> If someone DoS's SAP, then SAP becomes useless anyway - our users on the
> end of DSL lines were complaining that their DSL lines were full of SAP
> traffic (as well as their router CPU melting).
>
> Is it sensible to rate-limit SAP to 1Mbps? Anyone doing this with "ip
> multicast rate-limit" on Cisco, and got advice?

We've rate-limited SAP to 1Mbps on our edge to protect our customers as 
well.  We did this on Jan 11 2006 when the previous SAP flood (from 
Greece, if I recall correctly) occurred.  We're doing this with Juniper.

I'm happy I bothered to add the limiter back then as we didn't see any 
issues now :-).

Pekka