[c-nsp] BGP Architecture Question

[Jason Lixfeld]

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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