Michael K. Smith wrote: > On 6/5/09 4:42 PM, "Steve Bertrand" <st...@ibctech.ca> wrote: > >> Justin Krejci wrote: >> >>> If the private link between the two sites fails, will BGP allow for us to >>> access the IP subnets at site 2 from site 1 via the internet given that both >>> sites are advertising under the same ASN? >> No, because your router at site 2 will not accept any prefix with its >> own AS in the AS_PATH (which site 1 would be advertising from). >> >> > If you're running Cisco with the right IOS it looks like you could use the > 'neighbor x.x.x.x allowas-in' command to accept your own AS. Then you would > just have to set your local route origination so that the appropriate routes > were withdrawn when the backnet link goes down.
I stand corrected. I've read about this, but does anyone have operational experience with it that they can share? Even though we are a very small SP, I always feel that going against the traditional grain when doing things like this may leave a trail of undocumented, hard-to-troubleshoot issues in the future. To rephrase the OP's question, would it be BCP to acquire a second ASN, and without further de-aggregating, continue advertising each site's IP space to the DFZ, but from dissimilar ASs as opposed to the same one? Steve
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