Dynamic VRF route leak

Dynamic VRF route leaking is allowed between two or more user configured VRFs. Dynamic VRF is configured using export and import route-targets. Multiprotocol BGP (MP-BGP) is used to leak routes between the Dynamic VRFs. To configure MP-BGP, a separate address-family must be configured within BGP for each VRF, and simply redistributes routes (OSPF, static or connected) within that VRF for the routes to be leaked.

Dynamic VRF route leak restrictions and limitations

  • Route leaking is supported only between user configured VRFs.

  • Routes cannot be leaked from a nondefault VRF to a default VRF (or global VRF) and conversely.

  • MP-BGP is used only to leak IPv4/IPv6 routes between nondefault VRFs.

  • MP-BGP can be used to advertise the IPv4 or IPv6 routes to the BGP neighbors.

  • BGP neighbors can be configured using IPv4 or IPv6 addresses.

  • Multicast route leaking is not supported.

  • Route filtering on leaked routes cannot be performed, when BGP is used as routing protocol.

  • Extended Community cannot be sent to the neighbors with the prefix.

  • Max supported Dynamic leaked routes per system is 16K.