512 | Intermediate System to Intermediate System
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Table 23-1 displays the default values for IS-IS.
Configuration Information
To use IS-IS, you must configure and enable IS-IS in two or three modes: CONFIGURATION ROUTER
ISIS, CONFIGURATION INTERFACE, and ( when configuring for IPv6) ADDRESS-FAMILY mode.
Commands in ROUTER ISIS mode configure IS-IS globally, while commands executed in INTERFACE
mode enable and configure IS-IS features on that interface only. Commands in the ADDRESS-FAMILY
mode are specific to IPv6.
Note that by using the IS-IS routing protocol to exchange IPv6 routing information and to determine
destination reachability, you can route IPv6 along with IPv4 while using a single intra-domain routing
protocol. The configuration commands allow you to enable and disable IPv6 routing and to configure or
remove IPv6 prefixes on links.
Except where identified, the commands discussed in this chapter apply to both IPv4 and IPv6 versions of
IS-IS.
Table 23-1. IS-IS Default Values
IS-IS Parameter Default Value
Complete Sequence Number PDU (CSNP) interval 10 seconds
IS-to-IS hello PDU interval 10 seconds
IS-IS interface metric 10
Metric style Narrow
Designated Router priority 64
Circuit Type Level 1 and Level 2
IS Type Level 1 and Level 2
Equal Cost Multi Paths 16
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