--> Inter AS Option A is easiest, flexible and secure option in Inter AS MPLS VPN.
--> ASBR routers need to be connected with each other.
--> ASBR router should have one physical or sub interface for each vrf directly connected to other ASBR.
--> Each ASBR router thinks other ASBR router as CE router.
--> Packets are sent as unlabeled between ASBR routers, there is no end to end LSP path between customer sites.
--> VRF's must be configured on ASBR routers.
--> We can run any IGP/BGP protocol between ASBR routers.
-->Inter AS Option A is non-scalable as for every customer site the ASBR routers need to create subinterfaces.
--> Inter-AS Option A is also called as Back to Back VRF.
Md.Kareem
CCIE#54759
--> ASBR routers need to be connected with each other.
--> ASBR router should have one physical or sub interface for each vrf directly connected to other ASBR.
--> Each ASBR router thinks other ASBR router as CE router.
--> Packets are sent as unlabeled between ASBR routers, there is no end to end LSP path between customer sites.
--> VRF's must be configured on ASBR routers.
--> We can run any IGP/BGP protocol between ASBR routers.
-->Inter AS Option A is non-scalable as for every customer site the ASBR routers need to create subinterfaces.
--> Inter-AS Option A is also called as Back to Back VRF.
Md.Kareem
CCIE#54759
Thanks
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