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OSPF is a scalable, standards based
link-state routing protocol. The benefits of OSPF include no hop count
limitation, the capability to multicast routing updates, faster
convergence rates, and optimal path selection. The basic steps for OSPF operation are as follows:
- Establish router adjacencies
- Select a designated router and a
backup designated router
- Discover routes
- Select appropriate routes to use
- Maintain routing information
Learned in this module were the
following:
- The advantages of multiarea OSPF
configurations
- The OSPF components used in a large
multiarea OSPF internetwork
- The benefits of multiarea
configurations include reduced frequency of SPF calculations,
smaller routing tables, and reduced LSU overhead.
- The types of areas including stub,
totally stubby, and NSSA
- OSPF router types including ABRs and
ASBRs
- Link-state advertisements
- Virtual links
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