I have a doubt , I want to use same ASN number at different sites with different- different ISP.(consider i have public ip range 18.104.22.168/24 )
consider I have a public server with ip 22.214.171.124 at site A and and if i advertise same Public pool at B site , how return traffic know that if it has to come at site A or B.
or if some one from Internet want to access this 126.96.36.199 public server , Is that request will come to on Site A router or Site B router .
Maybe I could have been a wee bit clearer on what I was trying to say.
Duplicate ASN isn't really applicable between two sites exchanging routes due to Bgp default loop mechanism that an "AS will not accept routes that have it's own ASN in the route"
Now given you have two separate sites but one public ASN - My understanding is the ISPs will usually summarises prefixes and it's this summarisation which could possibly cause issues when two separate sites are using the same ASN.
So wouldn't it be more applicable use a private ASN and let your local ISP filter on this number prior to advertising your routes Into the public domain.
Sent from Cisco Technical Support iPad App
With PI space they would not be able to summarize.
I was assuming that hosts at site1 won't need to reach hosts at site2 unless they have an additional range used for communicating between each other.
Please rate helpful posts.