Could also just push default into OSPF from both ends (assuming you have the iBGP between both borders) if your goal is redundancy.
-Jack Carrozzo On Wed, Apr 7, 2010 at 10:06 AM, Dylan Ebner <dylan.eb...@crlmed.com> wrote: > You can still use vrrp in the inside. We have a similar configuration to what > you have defined. Two routers, 4 ISPs, BGP annoucing 2 /24's. We get partial > routes and prepend on 3 of the isps to only use our primary. Our primary is > delivered via fiber and the backup isps are delivered via copper ethernet. We > use interface tracking with reachability to determine if we are having a > problem with one of our downstreams. This way, if we still have a link light, > but no traffic flow we can detect and adjust accordingly. > > > > Dylan > > -----Original Message----- > From: Beavis [mailto:pfu...@gmail.com] > Sent: Wednesday, April 07, 2010 12:42 AM > To: nanog@nanog.org > Subject: Re: Best Practice: 2routers, 2isp, 1AS > > 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 <bfe...@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 >>> >>> >>> -- >>> () ascii ribbon campaign - against html e-mail >>> /\ www.asciiribbon.org - against proprietary attachments >>> >> >> > > > > -- > () ascii ribbon campaign - against html e-mail > /\ www.asciiribbon.org - against proprietary attachments > > > >
