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North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: BGP Anywhere - Global Redundancy
There are New IOS features for such situations, take a look at datacenter backup, SLB and these issues. On Apr 7, 2005 2:35 AM, Vandy Hamidi <[email protected]> wrote: > > All, > We're an ASP and are considering adding a secondary Backup Datacenter > (BDC) in the US to protect our web presence. > > My goal is to ensure automatic failover of my Primary DC's (IP) traffic > to the BDC in the event of a catastrophic failure of the PDC. > > I'm considering geographic load balancing and BGP Anywhere as the two > options. I'm clear on how the Geo LB works, but have some doubts about > BGPAW as I've never implemented it before and documentation online is > pretty weak to non-existent. > > Below is how I believe it should be done. > From PDC: > -Advertise CIDR block to all peers w/good metric (0 hop count) > From BDC: > -Advertise same CIDR block to all peers w/poor metric (+20 hop > count) > > During normal operation, all ASes will route production traffic to PDC. > In the event of catastrophic failure at PDC; PDC advertisements will > cease, BDC route will become the only one on the net and traffic will > route to the BDC. > > Questions: > 1) Will this work? > 2) Other suggestions or alternatives? > 3) Any chance that traffic could flow to BDC for any reason? > 4) Any internet etiquette I could be ignoring? > 5) What would you estimate the failover time would be? > 6) Assuming the routers at PDC and BDC pull down full routing table, how > will the receipt of the PDC CIDR advertisement be treated? BGP rules > say it will be dropped as a routing loop. What alternatives would I > have if I want to be able to route that CIDR block traffic from the BDC > to the PDC. Confed? Cisco conditional advertisements? > > Thanks all. This is the only place I can think of that would have the > expertise to comment. > > -=Vandy=- > >
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