In Layer 2 Virtual Services Network (L2 VSN) functionality, a VLAN is mapped to a Service ID and becomes a customer VLAN (C-VLAN). C-VLANs are bridged over the Fabric Connect core infrastructure using the shortest path topology learned using IS-IS.
| IMPORTANT: | With the Layer 2 VSN Service Creation feature, you can provision Layer 2 VSNs automatically. Do not use this feature if the device is running Fabric Attach. Fabric Attach dynamically makes equivalent configuration changes, and if Fabric Assist is enabled, it will change those settings to static on the device. |
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Enhanced Validation
Validation ensures consistency between service applications within a service definition. However, validation is done only when you save the entire service definition. This delay is problematic, because you can lose all the manual edits made since the last save.
Fabric Assist performs validation as soon as you enable it. This enhanced validation is at a more granular level within the service definition than validation without Fabric Assist. It also ensures that the Service ID Range does not overlap with existing L2 VSN services in other service applications within the same service definition. The row editor widgets for each grid within the Service Application panel (VRF Definition, VLAN Definition, L2 VSN, and L3 VSN) also perform this enhanced validation when you select the corresponding Update button.
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