I-D ACTION:draft-noguchi-isis-protocol-topology-00.txt

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	Title		: Protocol Topology Support for IS-IS
	Author(s)	: K. Noguchi, T. Takada
	Filename	: draft-noguchi-isis-protocol-topology-00.txt
	Pages		: 6
	Date		: 2003-1-28
	
RFC 1195 [1] documents a dual routing protocol that can be used to
route both CLNP and IPv4, that is Integrated IS-IS.  [2] adds
functionality to Integrated IS-IS so that it supports IPv6.
RFC 1195 [1] places topological restrictions on networks that are
routed using Integrated IS-IS, specifically, that every router in a
level-1 area must be capable of all network layer protocols that are
present in that area, and every router in a level-2 area must be
capable of all network layer protocols that are present in the whole
IS-IS routing domain.
The mechanism described in this document enables a single IS-IS
routing domain to support different network layer protocol topologies
by maintaining separate SPF trees for each network layer protocol.

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