A BGP speaker will not accept routes with its own AS in the path, nor should it. Whilst a number of people have suggested using allowas-in, I'd personally not recommend it as loop prevention is generally a good thing - if you ever added a BGP speaker to one network that also had internet peerings (plus iBGP to the existing router) allowas-in would result in internal traffic going over the external link since eBGP is preferred over iBGP. You could of course prevent that by mangling attributes, but why create the potential work and pain for yourself? Instead, I'd suggest setting up iBGP peerings for each of the upstreams, rewriting the next hop address of received routes to the upstream of that particular interface. Since it would really be pointless/wasteful to advertise your internet routes over iBGP, be sure to restrict it to just your own networks. Doing it this way means that you can quite easily just spin up a new peering if you get a real backbone link, and you don't take on the downsides of using allowas-in. Regards Oliver On Monday 10 June 2013 11:36:44 Dennis Burgess wrote:
I have a network that has three peers, two are at one site and the third is geographically diverse, and there is NO connection between the two separate networks.
Currently we are announcing several /24s out one network and other /24s out the second network, they do not overlap. To the internet this works fine, however, providers a/b at site1 do not send us the two /24s from site b.. We have requested them to, but have not seen them come in, nor do we have any filters that would prohibit them from coming in.
Is this normal? Can we receive those routes even though they are from our own AS? What is the "best practice" in this case?
Dennis Burgess, Mikrotik Certified Trainer Author of "Learn RouterOS- Second Edition <http://www.wlan1.com/product_p/mikrotik%20book-2.htm> "
Link Technologies, Inc -- Mikrotik & WISP Support Services
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