Implementing Is-Is; Enable Is-Is And Configure Level 1 Or Level 2 Routing; Warm Standby And Nonstop Routing For Ospf Version - Cisco NCS 5500 Series Configuration Manuals

Implementing IS-IS

Integrated Intermediate System-to-Intermediate System (IS-IS), Internet Protocol Version 4 (IPv4), is a
standards-based Interior Gateway Protocol (IGP). The Cisco software implements the IP routing capabilities
described in International Organization for Standardization (ISO)/International Engineering Consortium (IEC)
10589 and RFC 1195, and adds the standard extensions for single topology and multitopology IS-IS for IP
Version 6 (IPv6).
This module describes how to implement IS-IS (IPv4 and IPv6) on your Cisco IOS XR network.
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Enable IS-IS and Configure Level 1 or Level 2 Routing

This task explains how to enable IS-IS and configure the routing level for an area.
Note
Configuring the routing level in Step 4 is optional, but is highly recommended to establish the proper level
of adjacencies.
Before you begin
Although you can configure IS-IS before you configure an IP address, no IS-IS routing occurs until at least
one IP address is configured.
Enable IS-IS and Configure Level 1 or Level 2 Routing, on page 3
Single-Topology IPv6, on page 5
Customize Routes for IS-IS, on page 12
Set Priority for Adding Prefixes to RIB, on page 15
IS-IS Interfaces, on page 16
Limit LSP Flooding, on page 19
IS-IS Authentication, on page 23
Nonstop Forwarding, on page 26
ISIS NSR, on page 29
Multiprotocol Label Switching Traffic Engineering, on page 31
IS-IS Overload Bit Avoidance, on page 37
Configuring Global Weighted SRLG Protection, on page 39
References for IS-IS, on page 41
Routing Configuration Guide for Cisco NCS 5500 Series Routers, IOS XR Release 6.3.x
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