Simple definition
Route redistribution imports routes from one routing source into another protocol, requiring filters to avoid loops and unwanted advertisements.
Purpose and use
Route redistribution injects routes learned from another source, such as static routing or a different protocol, into a routing protocol.
How does it work?
The router converts relevant information and applies metrics, filters and attributes defined by policy.
Example and verification
Before enabling broad exchange, verify expected routes on both sides and how reintroduced routes are identified and filtered.
Points to watch
Mutual redistribution without safeguards can create control-plane loops, suboptimal paths or excessive propagation.
In short
Redistribution requires an explicit boundary policy defining which routes cross it and how unwanted re-entry is prevented.