TAILIEUCHUNG - The Complete IS-IS Routing Protocol- P12

The Complete IS-IS Routing Protocol- P12:IS-IS has always been my favourite Interior Gateway Protocol. Its elegant simplicity, its well-structured data formats, its flexibility and easy extensibility are all appealing – IS-IS epitomizes link-state routing. Whether for this reason or others, IS-IS is the IGP of choice in some of the world’s largest networks. Thus, if one is at all interested in routing, it is well worth the time and effort to learn IS-IS. | 320 12. IP Reachability Information learned from that mistake was to simply define a Reference Bandwidth that will most likely not hit the ceiling in the next 10 years like 100 Terabits per second. But the problem with setting the Reference Bandwidth too high is that most routing protocols including IS-IS and OSPF have finite and limited Metric fields. This is a problem similar to the 6-bit metric space of the original ISO 10589 TLVs where all the low-speed links get clipped to the maximum value and thereby do not provide any further differentiation. Today the most common Auto-Bandwidth setting for IS-IS is 1 Terabit per second or 1000 Gigabit per second which can through the use of 24-bit metric fields go down to 64 KBit s without clipping the metrics. Manual setting of the Reference Bandwidth is not supported on IOS. In JUNOS you can configure it through use of the referencebandwidth bandwidth command under the protocols isis configuration branch. JUNOS configuration In JUNOS you can automatically calculate the metric that IS-IS is using by configuring the reference-bandwidth bandwidth command. hannes@New-York show configuration . protocols isis reference-bandwidth 1000g interface so-0 0 interface . In very large IS-IS networks the policy to set the routing metric is not as simple as a division of the Reference Bandwidth. Typically the routing metrics should be controlled manually to have tighter control about the impact of all kinds of re-routing scenarios. Static Metric Setting Service providers do not always want IS-IS to calculate its own routing metrics with a simple formula such as inverse bandwidth. Typically for very expensive links like transatlantic links there is an additional de-preference or negative bias expressed in an increased routing metric. Consider Figure where one of the most important links in the European topology goes down. The SP does not want to heal the European core over the transatlantic links as from a .

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