IS-IS even has extensions for use in “non-packet networks”, such as SONET and optical networks, as part of the Generalized Multi-Protocol Label Switching (G-MPLS) protocol suite. It has since evolved sign- cantly: IS-IS has IPv4 and IPv6 (and IPX) addressing IS-IS can carry information about multiple topologies link attributes have expanded to include traf?c engineering para- ters a new methodology for restarting IS-IS gracefully has been developed. For example, IS-IS started as a link-state routing protocol for ISO networks. Interactions between different implementations, the dynamic nature of routing, and new protocol features all contribute to making routing protocols complex to design, write and deploy effectively in networks. Every design decision, be it in architecture, implementation or deployment, has consequences, some unanti- pated, some unknowable, some dire.

However, it is hazardous to call any routing protocol “simple”. Thus, if one is at all interested in routing, it is well worth the time and effort to learn IS-IS. Whether for this reason or others, IS-IS is the IGP of choice in some of the world’s largest networks. Its elegant simplicity, its well-structured data formats, its ?exibility and easy extensibility are all appealing – IS-IS epitomizes link-state routing. IS-IS has always been my favourite Interior Gateway Protocol.

For ios instal Personal Backup 6.3.4.1