Inter-VSN routing with SPBM allows routing between Layer 2 VLANs with different I-SIDs.
Inter-VSN routing provides a routing hub for Layer 2 Virtual Services Network edge devices, Layer 3 devices, routers, or hosts connected to the SPBM cloud using the SPBM Layer 2 VSN service. To go between a routed network, a Layer 2 VSN termination point provides the routing services to hop onto another Layer 2 VSN, using I-SID.
Note
The Layer 2 VLANs must be in the same VRF. You cannot route traffic between two different VRFs with Inter-VSN routing.
In this example, the C-VLANs are associated with I-SIDs on the BEBs using SPBM Layer 2 VSN. With Inter-VSN routing enabled, BCB C can route traffic between VLAN 11 (I-SID 2011) and VLAN 12 (I-SID 2012).
IP interfaces are where the routing instance exists. In this case, on Switch-20.
Note
The switch does not support IP multicast over Fabric Connect routing on inter-VSN routing interfaces.