[c-nsp] BGP Architecture Question

[Rodney Dunn]

That's exactly what OER is designed to solve.

You can not control just load by a single static
route setup.  Traffic patterns change and that
is what OER is designed to handle.  Make adjustments
as the traffic changes.

There are a bunch of different hacks you can use
to force load over a couple links and some work
better than others.  I'm simply given an example
of a new one that very few people have used because
it's new.

Rodney


On Thu, Nov 18, 2004 at 08:57:33AM -0500, Jason Lixfeld wrote:
> The 2621XM will take 256MB, the 2621 will take only 64MB.  64MB isn't  
> enough to do a full BGP feed but I would NOT recommend doing a full BGP  
> feed on one router and a partial feed on another router if your intent  
> is to load balance as opposed to a primary/secondary type  
> configuration.  In a primary/secondary configuration, I think that sort  
> of thing would be ideal because you are guaranteed a closer primary and  
> a secondary link type traffic patterns (outbound anyway) if you have a  
> full table on one router and only a default route on the other router.
> 
> If you want to load balance as opposed to use one link as a primary and  
> one link as a backup, here's one idea:
> 
> Tell both of your providers that you no not want to accept a full BGP  
> table.  You only want a default route, peering routes and customer  
> routes from your providers.  This will drop your BGP table to likely no  
> more than a few thousand routes from both providers.  64MB of DRAM will  
> be fine for that.  The default route will catch anything that's not a  
> customer or a peering route from either provider and I think you'll  
> find it will balance the traffic quite nicely, again, outbound anyway.
> 
> On 18-Nov-04, at 7:56 AM, Rodney Dunn wrote:
> 
> > I didn't go check all the memory requirements for
> > the 2621 but if you have enough memory that should
> > work.
> >
> > http://www.cisco.com/en/US/netsol/ns471/ 
> > networking_solutions_package.html
> >
> > The customer I worked with a couple days ago was doing
> > it on NPEG1's of 72xx's with 1Gig of memory.
> >
> > You should be able to control the memory usage of OER to
> > some degree by changing the number of routes it watches.
> > I don't have a lot of data on that yet though.
> >
> > I'll have to get some more data on that.
> >
> > Rodney
> >
> >
> > On Thu, Nov 18, 2004 at 12:27:10PM +1000, Virgil wrote:
> >> On 18/11/04 2:39 AM, "Rodney Dunn" <rodunn at cisco.com> wrote:
> >>
> >> Rodney,
> >>
> >>> We then made one of the Routers the
> >>> OER master while both of the routers served
> >>> as OER borders.
> >>
> >>>>> I will have each T1 going into a seperate router. I have
> >>>>> one Cisco 2621 and one Cisco 2621XM.
> >>
> >> Is that still a viable option on the 2600 platform though?
> >>
> >> Virgil
> >>
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