9.8 Types of Redistribution

CCNP RS 300-101, Configuring Redistribution, Uncategorized

There are two types of route redistribution, each with two methods.

  • One-Point Redistribution: Redistribution which occurs on one router
    • One-Point, One-Way: We redistribute from one routing protocol to another only (not in both directions)
    • One-Point, Two-Way: We redistribute between two routing protocols, that is, from protocol A to protocol B, and also vice versa (also called “mutual redistribution.”
  • Multi-Point Redistribution: Redistribution that occurs on two or more routers for a single area or logical boundary.
    • Multi-Point, One-Way: One routing protocol to another only, but occurring on multiple routers, thus the “multi-point” classification
    • Multi-Point, Two-Way: Two routers are performing mutual redistribution between routing protocols.

Some Points:

  1. One-Way redistribution requires the use of static or default routes, as one routing protocol will not have all the information required to make routing decisions.
  2. One-Point redistribution has the advantage of limiting routing loops, because multiple redistribution points will often cause problems due to differences in administrative distance and incompatible metrics. However, there are limitations to one-point redistribution in that if the router fails, there is no reachability to the non-redistributed routing protocol. This is why multi-point redistribution is advantageous.
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