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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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As a result, they are conceptually similar. Both support variable length subnet maskscan use multicast to discover neighboring routers using hello packetsand can support authentication of routing updates.

Retrieved from ” https: 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 network osis, a group of physically connected computers or similar devices.

IS-IS is a link-state routing protocoloperating by reliably flooding link state information throughout a network of routers. However, the basic concepts are similar.


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. Packets datagrams are then forwarded, based on the computed ideal path, through the isiss to the destination.

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Supported Standards for IS-IS

For topics with similar names, see Isis disambiguation. From Wikipedia, the free encyclopedia. This map indicates the subnets which each IS-IS router can reach, and the lowest-cost shortest path to a subnet is used to forward traffic.

IS-IS is an interior gateway protocoldesigned for use within an administrative domain or network. In addition to that, IS-IS is less “chatty” and can scale to support larger networks.

This page was last edited on 28 Novemberat Each IS-IS router independently builds a database of the network’s topology, aggregating the flooded network information. The result is that an IS-IS router is only ever a part of a single area.

It accomplishes this by determining the best route for data through a packet-switched network. IS-IS has rvc called “the de facto standard for large service provider network backbones.

All articles with unsourced statements Articles with unsourced statements from February Pages using RFC magic links.

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

This permits SPB to support large Layer 2 topologies, with fast convergence, and improved use of the mesh topology. 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.

However IS-IS is easier to expand: IS-IS is neutral regarding the type of network addresses for which it can route.

SPB allows for shortest-path forwarding in an Ethernet mesh network context utilizing multiple equal cost paths.

Supported Standards for IS-IS – TechLibrary – Juniper Networks

IS-IS routers are designated as being: Retrieved May 24, ISO standards by standard number. Level 1 intra-area ; Level 2 inter area ; or Level 1—2 both.

International Organization for Standardization. The complete IS-IS routing protocol. OSPF has a larger set of extensions and optional features specified in the protocol standards.