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OSPF and IS-IS: Choosing an IGP for Large-Scale Networks by Jeff Doyle

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7.4. IS-IS Areas

In the introduction to Section 7.3, I stated that OSPF areas are easier to design, configure, and administer than IS-IS areas because the tools for creating different kinds of network behaviors are inherent in the protocol, whereas similar behaviors in IS-IS must be created using routing policies. While this is true, here is a factor in favor of IS-IS: Those same routing policies, although more difficult to configure and administer, might make IS-IS easier to troubleshoot. Whether you are dealing with automobiles, home appliances, or routing protocols, ease of use on the surface often means complexity “under the hood,” and you have to get into those greasy parts under the hood to do troubleshooting. In the case of OSPF, the ...

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