MPLS (BGP) Route Target or Route Distinguisher

The differences between an RT and an RD are:

The RT Community value identifies (TAG) the prefixes which are to be exported from a VRF. This TAG is then used to identify the prefixes to be imported by a remote PE router.

The RD helps to identify the VRF ownership of information by tagging a value to the packet forwarded through the network. Much like a .1P tag it references the VRF to use.

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