Advanced OSPF - OSPF Path Selection

4 important questions on Advanced OSPF - OSPF Path Selection

How are the different path types prioritized by OSPF?

  1. Intra-area
  2. Interarea
  3. External Type 1
  4. External Type 2

How is the OSPF Link Cost calculated?

The Cost = Reference bandwidth / Interface bandwidth

Default Reference Bandwidth is 100Mbps

with command:
auto-cost reference-bandwidth bandwidth-in-mbps
The reference bandwidth can be set for all OSPF interface associated with the OSPF Process.

What is true regarding the OSPF E1 and N1 routes and Area 0.

If the ASBR is in a different area, the route is only installed when the traffic goes through Area 0.
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OSPF supports ECMP, how many routes can be installed by default?

It supports 4 maximum routes by default.

Can be changed with the command:
maximum-paths maximum-paths

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