When the MPLS-BGP cross-domain correlation feature is enabled, the MPLS Topology Servercomponent of MPLS Managerimports from IP Availability Managera BGP topology collection set named BGP-System. BGP-System contains BGP-enabled router and switch devices.
The MPLS Topology Serveruses SNMP and the BGP4-MIB to query the imported routers and switches for BGP information, and uses instances of certain Domain Manager object classes to create within its repository a data model representation of the discovered BGP topology. The BGP data model is shown in BGP data model.
![](images/GUID-25A015C7-3D27-4BD3-A831-DB177C5D9B7C-low.png)
The MPLS Topology Serveralso invokes CLI commands to query the managed network for BGP route reflector information.