512 | Intermediate System to Intermediate Systemw w w . d e l l . c o m | s u p p o r t . d e l l . c o m Table 23-1 displays the default values for IS-IS.Configuration InformationTo use IS-IS, you must configure and enable IS-IS in two or three modes: CONFIGURATION ROUTERISIS, CONFIGURATION INTERFACE, and ( when configuring for IPv6) ADDRESS-FAMILY mode.Commands in ROUTER ISIS mode configure IS-IS globally, while commands executed in INTERFACEmode enable and configure IS-IS features on that interface only. Commands in the ADDRESS-FAMILYmode are specific to IPv6.Note that by using the IS-IS routing protocol to exchange IPv6 routing information and to determinedestination reachability, you can route IPv6 along with IPv4 while using a single intra-domain routingprotocol. The configuration commands allow you to enable and disable IPv6 routing and to configure orremove IPv6 prefixes on links.Except where identified, the commands discussed in this chapter apply to both IPv4 and IPv6 versions ofIS-IS.Table 23-1. IS-IS Default ValuesIS-IS Parameter Default ValueComplete Sequence Number PDU (CSNP) interval 10 secondsIS-to-IS hello PDU interval 10 secondsIS-IS interface metric 10Metric style NarrowDesignated Router priority 64Circuit Type Level 1 and Level 2IS Type Level 1 and Level 2Equal Cost Multi Paths 16
