[c-nsp] BGP memory on a 6500

[Rodney Dunn]

We are putting in a warning that will go to the syslog when the
hw reaches 95% capacity to give a earlier warning.

What we've found is most people just miss/ignore the warning when
the problem happens because they didn't realize at the time reachability
to those destinations could be totally broken. But then a lot of times
the prefixes are covered under a less specific if the same forwarding
next hop so on the surface everything "just works".

Rodney

On Mon, Oct 02, 2006 at 04:40:11PM -0700, David Sinn wrote:
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> My personal experience, and one related to me by someone else who  
> overran their forwarding table, is that while the syslog will tell  
> you it is doing software switching, reality is quite opposite.  In  
> both instances when the table overran reachability to those  
> overflowed prefixes was non-existent.
> 
> David
> 
> On Oct 2, 2006, at 2:24 PM, Rick Kunkel wrote:
> 
> > Gotta jump back to this for just a sec... sorry to be so pesky... ;)
> >
> > OK... Supervisor 2 only has enough TCAM for a little more than about
> > 200,000 routes.  Got it.
> >
> > And I'm understanding that it's switching things in software after  
> > that,
> > is that right?  Does that mean that it will switch 200k+ of the  
> > routes in
> > hardware, and the remaining ones in software?
> >
> > Essentially, what I'm trying to figure out is if I *DO* go over  
> > that 200k+
> > routes, how greatly am I gonna suffer?
> >
> > Thanks,
> >
> > Rick
> >
> >
> > On Wed, 27 Sep 2006, Francois Corthésy wrote:
> >
> >> Hi Rick,
> >>
> >> Might I point to this earlier discution :
> >> https://puck.nether.net/pipermail/cisco-nsp/2006-August/032822.html
> >>
> >> Essentially, If you plan on using anything else than a Sup720-3BXL  
> >> for
> >> Full BGP routing on a 6500 for more than 1 or 2 years you are stuck.
> >>
> >> Francois
> >>
> >> Rick Kunkel wrote:
> >>> Hello all,
> >>>
> >>> I'm considering a 6500, and am trying to assemble a list of required
> >>> components.  I'm looking at the Sup2 with PSC2 and MSCF2.  You  
> >>> can get the
> >>> MSFC with 512MB of RAM.  Is THIS the RAM that the BGP routing  
> >>> table would
> >>> be used, or is that stored elsewhere?  If elsewhere, then where?
> >>>
> >>> THanks,
> >>>
> >>> Rick Kunkel
> >>>
> >>>
> >>> _______________________________________________
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> >>>
> >>>
> >>>
> >>
> >>
> >
> >
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