[c-nsp] Three ISPs - Three Edge Routers - iBGP Mesh

[-Hammer-]

Mark,
     I'm not questioning your design, I'm just curious. Why add a third 
ISP? Redundancy? Is it a capacity issue? I understand having redundancy 
to two providers but I'm curious why you want a third? Or is this just a 
carrier thing and I'm thinking from and end customer viewpoint?

-Hammer-

"I was a normal American nerd"
-Jack Herer



On 11/22/2011 08:59 AM, Joseph Jackson wrote:
> On Tue, Nov 22, 2011 at 8:41 AM, Mark Mason<MMason at jackhenry.com>  wrote:
>    
>> Two of our DC's are about to get their 3rd internet drop. Each ISP connection has its own edge router. HSRP is running facing on the LAN side. Please see https://supportforums.cisco.com/message/3496562#3496562 for topology and further discussions. I expect that packets leaving the DC will hit the HSRP active, perform the route lookup and exit via the best path BGP has selected (and/or the best path my PfR setup has installed). Does anyone see any gotcha's with just letting BGP do its thing; no local-pref changing, no path prepending?
>>
>> Mark Mason
>>      
> It should be fine.  You'll get asymmetric routing regardless of what
> you do for the most part since you can only influence another AS'
> routing polices only so much using prepending.  I'd only mess with
> localpref if you are over loading one of the links.
>
>
> Joseph
>
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