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Configure VRF-lite | Page 19
Dynamic inter-VRF communication explained
The command redistribute <protocol> can be configured in an OSPF instance, BGP
address-family, or RIP address-family. Via this command, routes are imported from the FIB
associated with the VRF instance into the dynamic routing protocol table. Any routing
protocol (OSPF, BGP, RIP static, connected, etc.) can be redistributed.
For example, if OSPF instance1 is configured on VRF red, and if OSPF 1 contains the
command redistribute BGP, then BGP routes will be copied from VRF red FIB to OSPF
instance1.
Similarly, if BGP address-family is configured on VRF red, and if the address-family contains
the command redistribute OSPF, then OSPF instance1 routes will be copied from the
VRF red FIB into the BGP red address-family route table.
Dual role of
BGP
The first role that BGP plays in a VRF-lite environment is to facilitate BGP peering to an
external router operating within the VRF routing domain via the neighbor x.x.x.x command
configured in a BGP address-family.
The second role that BGP plays is to facilitate route leakage between VRF routing domains.
Dynamic routing protocols (RIP and OSPF) do not facilitate route leakage. RIP and OSPF
only operate within a VRF routing domain.