mVPN Service Design

Globenet provides an intra-AS multicast VPN (mVPN) service. The details are similar to those discussed in the preceding chapter, including the use of Protocol-Independent Multicast Sparse Mode (PIM SM) in the core and Protocol-Independent Multicast Source-Specific Multicast (PIM SSM) at the edge. However, because Globenet caters to large international enterprises, this service may extend across two or more of its regional networks. The implications of this are that the service needs to operate within an inter-AS environment. Currently Globenet has no requirements to run an mVPN service with any of its regional service provider partners.

As mentioned earlier, Globenet chose to use option B for inter-AS connectivity between all its worldwide regions. This model requires the exchange of VPNv4 routes directly between ASBRs. A number of observations may be made with this type of connection: