Two Areas Are Configured and the Total Costs of Two Routes Learnt from These Two Areas Are the Same. However, No ECMP Route Be Generated. Why?

Latest reply: Apr 20, 2017 06:05:36 839 1 0 0
Two Areas Are Configured and the Total Costs of Two Routes Learnt from These Two Areas Are the Same. However, No ECMP Route Be Generated. Why?
  • x
  • convention:

Adamcolob
Created Apr 20, 2017 06:05:36 Helpful(0) Helpful(0)

According to RFC 2328, the following conditions must be met for Equal Cost Multipath (ECMP) routes to be generated in OSPF:

The routes are learnt from the same area.
The priorities and total costs of the routes are the same.
RFC 2328 does not clearly define whether an intra-area or inter-area route is to be chosen under the same multi-area conditions. On the router, the route last advertised is not selected. For Type-5 external link-state advertisements (LSAs), RFC 2328 clearly defines that the route with the greatest area ID is preferred.
  • x
  • convention:

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