Administrator Guide

• Accepts external IPv6 information and advertises this information in the PDUs.
The following table lists the default IS-IS values.
Table 15. 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
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: When 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 described in this chapter apply to both IPv4 and IPv6 versions of
IS-IS.
Configuration Tasks for IS-IS
The following describes the configuration tasks for IS-IS.
• Enabling IS-IS
• Configure Multi-Topology IS-IS (MT IS-IS)
• Configuring IS-IS Graceful Restart
• Changing LSP Attributes
• Configuring the IS-IS Metric Style
• Configuring IS-IS Cost
• Changing the IS-Type
• Controlling Routing Updates
• Configuring Authentication Passwords
• Setting the Overload Bit
• Debuging IS-IS
Intermediate System to Intermediate System
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