Later adapted to carry IP prefixes in addition to CLNP. (known as Integrated or Dual IS-IS) as described in. RFC ▫ Predominantly used in ISP environment . Unused Features Some features defined in RFC are not in current use. Parker Informational [Page 2] RFC Interoperable IP Networks using IS-IS May. Intermediate System to Intermediate System is a routing protocol designed to move information (IP), the Network Layer protocol of the global Internet. This version of the IS-IS routing protocol was then called Integrated IS-IS (RFC ) .

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It accomplishes this by determining the best route for data through a packet-switched network. The complete IS-IS routing protocol.

Level 1 intra-area ; Level 2 inter area ; or Level 1—2 both. OSPF has a larger set of extensions and optional features specified in the protocol standards. This page was last edited on 28 Novemberat Level 1—2 routers exchange information with both levels and are used to connect the inter area routers with the intra area routers.

Intermediate System to Intermediate System IS-ISalso written ISIS is a routing protocol designed to move information efficiently within a computer networka group of physically connected computers or similar devices.


IS-IS is an interior gateway protocoldesigned for rfcc within an administrative domain or network. However, the basic concepts are similar. In addition to that, IS-IS is less “chatty” and can scale to support larger networks.

RFC – Use of OSI IS-IS for routing in TCP/IP and dual environments

IS-IS is a link-state routing protocoloperating by reliably flooding link state information throughout a network of routers. International Organization for Standardization. Retrieved May 24, SPB allows for shortest-path isjs in an Ethernet mesh network context utilizing multiple equal cost paths. IS-IS has been called “the de facto standard for large service provider network backbones.

This permits SPB to support large Layer 2 topologies, with fast convergence, and improved use of the mesh topology. Each IS-IS router independently builds a database of the network’s topology, aggregating the flooded network information.

Retrieved from ” https: Routing information is exchanged between Level 1 routers and other Level 1 routers of the same area, and Level 2 routers can only form relationships and exchange information with other Level 2 routers. This article is about a computer network protocol. 1195 routers are designated as being: The logical view is that OSPF creates something of a spider web or star topology of many areas all attached directly to Area Zero and IS-IS by contrast creates a logical topology of a backbone of Level 2 routers with branches of Level 1—2 and Level 1 routers forming the individual areas.

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IS-IS – Wikipedia

The result is that an IS-IS router is only ever a part of a single area. IS-IS is neutral regarding the type of network addresses for which it can route.

As a result, they are conceptually similar. Packets datagrams are then forwarded, based on the computed ideal path, through the network to the destination. From Wikipedia, rdc free encyclopedia.

Supported Standards for IS-IS

ksis All articles with unsourced statements Articles with unsourced statements from February Pages using RFC magic links. For topics with similar names, see Isis disambiguation. This map indicates the subnets which each IS-IS router can reach, and the lowest-cost shortest path to a subnet is iisis to forward traffic. Both support variable length subnet maskscan use multicast to discover neighboring routers using hello packetsand can support authentication of routing updates.

However IS-IS is easier to expand: Views Read Edit View history.

ISO standards by standard number.