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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IS-IS – Wikipedia

The logical view is that OSPF creates something of a spider web or star topology of many areas all attached directly rfv 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. In addition to that, IS-IS is less “chatty” and can scale to support larger networks.

ISO standards by standard number. Both support variable length subnet maskscan use multicast to discover neighboring routers using hello packetsand can support authentication of routing updates.


This page was last edited jsis 28 Novemberat 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 neutral regarding the type of network addresses for which it can route.

IS-IS routers are designated as being: By using this site, you agree gfc the Terms of Use and Privacy Policy. The complete IS-IS routing protocol.

Each IS-IS router independently builds a database of the network’s topology, aggregating the flooded network information. International Organization for Standardization. Level 1 intra-area ; Level 2 inter area ; or Level 1—2 both.

This permits SPB to support large Layer 2 topologies, with fast convergence, and improved use of the mesh topology. For topics with similar isks, see Isis disambiguation.

As a result, they are conceptually similar.

SPB allows for shortest-path forwarding in an Ethernet mesh network context utilizing multiple equal cost paths. 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 a link-state 195 protocoloperating by reliably flooding link state information throughout a network of routers.

Supported Standards for IS-IS

Retrieved May 24, IS-IS is an interior gateway protocoldesigned for use within an administrative domain or network. All articles with unsourced statements Articles with unsourced statements from February Pages using RFC magic links. Routing information is exchanged between Level isiz 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.

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Packets datagrams are rdc forwarded, based on the computed ideal path, through the network to the destination. Retrieved from ” https: However IS-IS is easier to expand: However, the basic concepts are similar.

Level 1—2 routers exchange information with both levels and are used to connect the rffc area routers with the intra area routers.

Supported Standards for IS-IS – TechLibrary – Juniper Networks

It accomplishes this by determining the best route for data through a packet-switched network. This article is about a computer network protocol.

IS-IS has been called “the de facto standard for large service provider network backbones. OSPF has a larger set of extensions and optional features specified in the protocol standards. The result is that an IS-IS router is only ever a part of a single area.