Advanced OSPF

OSPF is an industry-standard routing protocol developed by the Internet Engineering Taskforce (IETF) as a replacement for legacy routing protocols that did not scale well in large environments. OSPF supports the following features:

• Variable-length subnet masks (VLSM).

• The use of areas to minimize Central Processing Unit (CPU) and memory requirements.

• A simple cost metric that you can manipulate to support up to six equal cost paths. The number of paths is limited only by the Internet Operating System (IOS).

• The use of authentication to ensure OSPF updates are secure and the use of multicast updates to conserve bandwidth.

• Faster convergence times ensuring updates and changes are propagated across the network.

• No limitation of network diameter or hop count. Limiting factors include only CPU and memory resources.

• The ability to tag OSPF information injected from any autonomous systems.

The following topics are covered in this section:

• Connecting multiple OSPF areas

• VLSM and summarization with OSPF

• OSPF over multiarea NBMA

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