[cisco-bba] trouble when a lot of users try and log on

[Wayne Lee]

> Pre-clone? Are you using config / IOS that prevents you using
> subinterface VAIs instead of the Full VAIs that pre-cloning gives you.
> (I did think that pre-cloning subinterface VAIs would still be
> an optimisation, but since it doesn't do it, I guess Cisco found not!).

We are using pre-clone as I thought it might help take off some of the pressure


> There are some tuning knobs available to limit the number of
> sessions the LNS will deal with at the same time. Without them it is
> possible for a mass disconnection / mass reconnections to make the
> LNS busy enough trying to deal with ALL new sessions to successfully
> deal with NONE of them.
>
> Google for "site:cisco.com Session scalability" and/or
> "site:cisco.com Broadband scalability"
>
> There are also some optimisations that help keep the CPU down a bit
> in general for L2TP, or especially on session setup.
>
> e.g.
>
> vpdn ip udp ignore checksum
> no virtual-template snmp
>
> Should be mentioned in the BB Scalabilty docs, but from a quick google
> I can't find the exact doc I'm thinking of.
>
> --
> Euan Galloway
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>

I'll do some more hunting.

Thanks