user manual

Implementing IS-IS on Cisco IOS XR Software
How to Implement IS-IS on Cisco IOS XR Software
RC-277
Cisco IOS XR Routing Configuration Guide
OL-14356-01
Note IPFRR is supported on the Cisco CRS-1 router.
IPFRR LFA is different from Multiprotocol Label Switching (MPLS) as it is applicable to networks
using conventional IP routing and forwarding. See Multiprotocol Label Switching Configuration Guide
for information on configuring MPLS IPFRR.
How to Implement IS-IS on Cisco IOS XR Software
This section contains the following procedures:
• Enabling IS-IS and Configuring Level 1 or Level 2 Routing, page RC-277 (required)
• Configuring Single Topology for IS-IS, page RC-280 (optional)
• Configuring Multitopology for IS-IS, page RC-284 (optional)
• Controlling LSP Flooding for IS-IS, page RC-285 (optional)
• Configuring Nonstop Forwarding for IS-IS, page RC-289 (optional)
• Configuring Authentication for IS-IS, page RC-291 (optional)
• Configuring Keychains for IS-IS, page RC-293 (optional)
• Configuring MPLS Traffic Engineering for IS-IS, page RC-295 (optional)
• Tuning Adjacencies for IS-IS, page RC-298 (optional)
• Setting SPF Interval for a Single-Topology IPv4 and IPv6 Configuration, page RC-301 (optional)
• Customizing Routes for IS-IS, page RC-303 (optional)
• Configuring MPLS LDP IS-IS Synchronization, page RC-306 (optional)
• Enabling Multicast-Intact, page RC-308 (optional)
• Tagging IS-IS Interface Routes, page RC-309 (optional)
• Setting the Priority for Adding Prefixes to the RIB, page RC-311 (optional)
• Configuring IP Fast Reroute Loop-free Alternate, page RC-313 (optional)
Note To save configuration changes, you must commit changes when the system prompts you.
Enabling IS-IS and Configuring 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.
Prerequisites
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.