Re: Best Practice: 2routers, 2isp, 1AS

[Beavis <pfunix () gmail com>]

thanks for the reply brian. :)

sorry for a bit lack on the info, I was thinking of using VRRP. but my
2 links are running on different interface-types isp1 runs via
ethernet while the other is on an ATM interface. I only have 1 router
that has an ATM interface. setting it to VRRP would cause me problems
if it was a physical failure. I have a small /24 to advertise on my
AS. I'll go and check on the "Performance Based Routing" you
recommend.


thanks,
-b

On Tue, Apr 6, 2010 at 11:25 PM, Brian Feeny <bfeeny () mac com> wrote:
> There are alot more questions that need to be asked.  Like how much address space do you have to announce? What 
> routes are you getting from each ISP?
>
> Assuming you are an end user, and knowing the very limited information I know at this point, I would make sure that 
> these two routers LAN interfaces are in some sort of transit vlan/subnet with my downstream router, which would also 
> be participating in iBGP.  Alternately you could have that router do VRRP/HSRP with your two border routers, but I 
> prefer iBGP.
>
> I would then setup both routers using OER (Optimized Edge Routing, i think now known as Performance Based Routing), 
> to handle outbound.  You could just announce your /24 out each provider (assuming that's what you had) to handle 
> inbound, or if you have larger than that you could announce the aggregate out both and more specifics out each to do 
> some type of balancing.
>
> Its hard to say there is a best practice here, as there are so many scenarios.  I will say that I like OeR/PfR for 
> edge customers who are dual homed.  BGP is very arbitrary, and its nice to have some real metrics that mean something 
> to play with :)
>
> Brian
>
>
> On Apr 7, 2010, at 1:14 AM, Beavis wrote:
>
> > Greetings!
> >
> >   Want to ask out anybody on the list about a "best practice" of the
> > setup below:
> >
> > - 2 ISP's (A & B)
> > - 2 Routers (A & B)
> >
> > I want Router-A for ISP-A, Router-B for ISP-B and have Router-A &
> > Router-B talk and be able to pass routes on each side in an event of a
> > physical failure on one of the Routers.
> >
> > I was planning at first to setup a multi-home BGP, but I want to have
> > physical redundancy as well.
> >
> > ASCII-diag
> >
> > =--[RouterA]--isp1(bgp)
> > L    |
> > A   iBGP
> > N    |
> > =--[RouterB]--isp2(bgp)
> >
> > Any recommendation would awesomely appreciated.
> >
> > -B
> >
> >
> > --
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