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Integrated IS-IS

The E-series router supports the Integrated IS-IS version of IS-IS. Integrated IS-IS provides a single routing algorithm to route both TCP/IP and OSI Connectionless Network Protocol (CLNP) packets. This design adds IP-specific information to the OSI IS-IS routing protocol. It supports IP subnetting, variable subnet masks, type of service (ToS), and external routing.

Integrated IS-IS allows for the mixing of routing domains; that is, IP-only routers, OSI-only routers, and dual (IP and OSI) routers. OSI and IP packets are forwarded directly over the link-layer services without needing mutual encapsulation. The E-series router supports IS-IS only for the routing and forwarding of TCP/IP packets. Forwarding of OSI packets is not supported.

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