Using IS-IS in Dual Environments
As specified in RFC 1195, Integrated IS-IS supports routing in dual environments with both ISO CLNS and IP services. Integrated IS-IS can be used to forward both IP and CLNP packets simultaneously in such environments. This section briefly discusses requirements for using IS-IS in such enviroments and potential issues that might arise.
A critical requirement for using IS-IS in a dual environment is to keep all routers in an area consistently configured. In other words, each area must be configured to surpport either IP only or CLNP only, or both, and all routers in the area must be configured similarly. This is necessary so that all routers in the area can build a consistent level Link-State database and obtain ...
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