Itu telecommunication Standardization Sector Temporary Document xxx(plen) study group 15


III.2.3 Level 2 Subdomain with External Routers running Integrated IS-IS



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III.2.3 Level 2 Subdomain with External Routers running Integrated IS-IS


Many operators currently run level-1 IS-IS routing in their OSI-only SDH NEs, and then link up multiple areas using level-2 IS-IS routing in an external router network.

If an operator wishes to use a similar model for a dual network then they can run level-1 Integrated IS-IS in each area, and level-2 Integrated IS-IS in an external router network. This gives a very similar network to the previous one, as shown in Figure III-3





Figure III-3


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