rd

Each VRF instance is identified by a unique route distinguisher (RD). The RD is prepended to the address being advertised. Because the RD provides overlapping client address space with a unique identifier, the same IP address can be used in different VRFs without conflict. The RD can be an autonomous system number, followed by a colon (:) and a unique arbitrary number as in "10:11". Alternatively, it canbe a local IP address followed by a colon (:) and a unique arbitrary number, as in "1.1.1.1:100".

Once the Route Distinguisher is configured for a VRF it cannot be changed or deleted. To remove the route distinguisher, you must delete the VRF.