Inter-AS VPN Option-A Overview
This chapter explain about Inter-AS VPN Option-A. Option A is the simplest of the options to inter-connect the ASBRs Option A has the following characteristics:
| • | Each customer VRF requires either a physical interface or more likely a subinterface. |
| • | Each ASBR thinks the other is a CE. |
| • | One logical interface per VPN. |
| • | Link may use any supported PE-CE protocol. |
| • | Packets are sent unlabelled between the ASBRs. |
| • | The most secure and easy option to provision. |
| • | Does not scale well to a large number of VPNs. |
Topology
Figure 25. InterAS-VPN Option-A
