Route redistribution on the firewall is the
process of making routes that the firewall learned from one routing
protocol (or a static or connected route) available to a different
routing protocol, thereby increasing accessibility of network traffic.
Without route redistribution, a router or virtual router advertises
and shares routes only with other routers that run the same routing protocol.
You can redistribute IPv4 or IPv6 BGP, connected, or static routes
into the OSPF RIB and redistribute OSPFv3, connected, or static
routes into the BGP RIB.
This means, for example, you can
make specific networks that were once available only by manual static
route configuration on specific routers available to BGP autonomous
systems or OSPF areas. You can also advertise locally connected routes,
such as routes to a private lab network, into BGP autonomous systems
or OSPF areas.
You might want to give users on your internal
OSPFv3 network access to BGP so they can access devices on the internet.
In this case you would redistribute BGP routes into the OSPFv3 RIB.
Conversely,
you might want to give your external users access to some parts of
your internal network, so you make internal OSPFv3 networks available
through BGP by redistributing OSPFv3 routes into the BGP RIB.