What is the difference between using remote as and local as in bgp?
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ZAP
Remote-As-
This keyword with bgp neighbor statement is used to define as no. of neighbor.
Local As-
This keyword is used in case of AS migration, when one service provider purchase another service provider.Its not possible to change all customer configuration at once, so at provider end we use local As keyword to form neighborship.
neighbor AS2 remote-as 200 nbr AS1 remote-as 100 nbr AS2 remote-as 200
nbr Cust remote-as 300
So Cust in AS 300 has formed neighborship with AS 200(Airtel).Assume Tata purchases Airtel, so tata want to use its own As no. in airtel's network, but the problem is customers still have As 200 configured in neighbor statement.
New Scenario will look like:-
Now on all airtel routers as we are running As 100, we need to run local as feature on all routers connected to customers so that customers can still form neighborship with AS200(OLD AIRTEL).
neighbor AS2 remote-as 200 nbr AS1 remote-as 100 nbr AS2 remote-as 200
nbr Cust remote-as 300
nbr Cust local-as 200
So, now there is no need to change any configuration on customer end.
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