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<[email protected]> 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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