Option inter, Inter-AS Option A


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This solution is also called inter-AS option Option inter. This solution is also called inter-AS option C. ASBR 1 performs the following operations: Adds the routes to the routing table of the VPN instance whose import target attribute matches the export target attribute of the routes.

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PE 3 advertises the received routes to CE 3. Associating a separate interface with each VPN also requires additional system resources.

The inter-AS connections may or may not be between different providers. The mechanisms to set up inter-as connections are described in [RFC]. Of particular interest for this draft are the ones documented in section 10 of [RFC]. The drawback of this option is that there needs to be option inter BGP session per sub-interface and at least one sub-interface per VPNwhich can be a potential scalability concern if there are a large number of VRFs.

Assume that the inner label assigned by PE 1 for the routes is Option inter. Before advertising the routes, ASBR 1 modifies the next hop as its option inter address, assigns a new inner label L2 to the routes, and associates L1 with L2.

Inter AS Option B MPLS VPN

Before advertising the routes, ASBR 2 modifies the next hop as its own address, assigns a new inner label L3 to the routes, and associates L2 with L3. PE 1 removes the inner label and outer tag and forwards the packet to CE 1.

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Inter-AS option B has better scalability than option A. Assume that the inner label assigned by PE 1 for the routes is Lx. Setting up an inter-AS public tunnel is difficult in this solution.

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  • This might be required if two carrier merge, or if one customer is connected to two carriers and would like to maintain end to end MLPS VPN.
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The next hop of the route is ASBR 1. The next hop for the route is ASBR 2. Assume that the outgoing label for the public option inter on PE 3 is Lv.

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After route advertisement and public tunnel setup, a packet is forwarded from CE 3 to CE 1 by using the following process: PE 3 performs the following routing table lookups for the packet: Finds a matching route with next hop PE 1 and inner label Lx, and encapsulates the packet with label Lx. AS transmits the packet to PE 1 by the outer label.

PE 1 removes the outer label, and forwards the packet to CE 1 according to the inner label Lx.