Itu telecommunication Standardization Sector Temporary Document xxx(plen) study group 15
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III.2.2 Level 2 SubdomainIf a larger network is needed, requiring level-2 routing, then the level-2 subdomain forwards packets between the level-1 areas, and thus must support all of the types of packet present in all of those level-1 area. The rules for the level-2 subdomain are:- 1. If IPv4 packets are forwarded in any of the areas (IP-only or Dual areas), then all of the routers in the level-2 subdomain must be able to forward IPv4. 2. If CLNP packets are forwarded in any of the areas (OSI-only or Dual areas), then all of the routers in the level-2 subdomain must be able to forward CLNP. Therefore, if any of the areas are dual, or if both OSI-only and IP-only areas exist, then, the routers in the level-2 subdomain must be dual. This is illustrated in Figure III-2. 
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