IS-IS Automatic Encapsulation

Document Type Expired Internet-Draft (isis WG)
Last updated 2003-03-31
Stream IETF
Intended RFC status (None)
Expired & archived
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Stream WG state WG Document
Document shepherd No shepherd assigned
IESG IESG state Expired
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


RFC 1195 [1] documents a dual routing protocol that can be used to route both CLNP and IPv4, that is Integrated IS-IS. Integrated IS- IS can now also be used to route IPv6 [12]. RFC 1195 [1] places certain topological restrictions on networks that are routed using Integrated IS-IS, specifically that every Intermediate System in a level-1 area must be able to forward all network layer protocols that are present in that area, and that every level-2 Intermediate System must be able to forward all network layer protocols present in the routing domain. The mechanism described in this document enables an Intermediate System or a group of Intermediate Systems that do not support a particular network layer protocol to be used in a level-1 area or level-2 subdomain where that network layer protocol is present. Specifically the mechanism provides automatic encapsulation and unencapsulation so that a packet or PDU may pass through an Intermediate System that would not normally be able to forward that type of packet.


Philip Christian (

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)