- Integrated IS-IS Routing Protocol Overview
- Configuring a Basic IS-IS Network
- Customizing IS-IS for Your Network Design
- IS-IS MIB
- IS-IS Support for an IS-IS Instance per VRF for IP
- Overview of IS-IS Fast Convergence
- Setting Best Practice Parameters for IS-IS Fast Convergence
- Reducing Failure Detection Times in IS-IS Networks
- Reducing Link Failure and Topology Change Notification Times in IS-IS Networks
- Reducing Alternate-Path Calculation Times in IS-IS Networks
- Enhancing Security in an IS-IS Network
IP Routing: ISIS Configuration Guide, Cisco IOS XE Release 3S
- Updated:
- July 11, 2017
Chapter: Setting Best Practice Parameters for IS-IS Fast Convergence
- Finding Feature Information
- Prerequisites for Setting Best Practice Parameters for IS-IS Fast Convergence
- Information About Setting Best Practice Parameters for IS-IS Fast Convergence
- How to Set Best Practice Parameters for IS-IS Fast Convergence
- Configuration Examples for Setting Best Practice Parameters for IS-IS Fast Convergence
- Where to Go Next
- Additional References
- Feature Information for Setting Best Practice Parameters for IS-IS Fast Convergence
Setting Best Practice Parameters for IS-IS Fast Convergence
This module describes how to configure an IS-IS router with parameters that are recommended as a basic step to improve network convergence.
- Finding Feature Information
- Prerequisites for Setting Best Practice Parameters for IS-IS Fast Convergence
- Information About Setting Best Practice Parameters for IS-IS Fast Convergence
- How to Set Best Practice Parameters for IS-IS Fast Convergence
- Configuration Examples for Setting Best Practice Parameters for IS-IS Fast Convergence
- Where to Go Next
- Additional References
- Feature Information for Setting Best Practice Parameters for IS-IS Fast Convergence
Finding Feature Information
Your software release may not support all the features documented in this module. For the latest feature information and caveats, see the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the Feature Information Table at the end of this document.
Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.
Prerequisites for Setting Best Practice Parameters for IS-IS Fast Convergence
Information About Setting Best Practice Parameters for IS-IS Fast Convergence
General Steps for Improving Convergence Time in the IS-IS Network
The process described in this module consists of configuration commands that are recommended as general first steps for improving convergence time in any IS-IS network. Performing the steps in the following process can help you save network resources and speed up network convergence.
To minimize the number of adjacencies, LSDBs, and related SPF and PRC computations that are performed, it is recommended that you have configured all Level 1 routers as Level 1 by using the is-type command. We recommend that you use the metric-style wide command because some features, such as setting prefix tags and MPLS traffic engineering, require that routers that are running IS-IS generate the new-style TLVs that have wider metric fields. If you use the default narrow metric style for IS-IS, the router generates and accepts old-style type, length, and value objects (TLVs). For more information on setting prefix tags, see the "Reducing Alternate-Path Calculation Times in IS-IS Networks" module.
How to Set Best Practice Parameters for IS-IS Fast Convergence
Setting Best Practice Parameters for IS-IS Fast Convergence
DETAILED STEPS
Configuration Examples for Setting Best Practice Parameters for IS-IS Fast Convergence
Example Enabling IS-IS on a Router and Setting Best Practice Parameters for IS-IS Fast Convergence
The following example enables the IS-IS routing protocol on the interfaces for Router A, enables IS-IS on Router A, and configures Router A with the basic commands recommended to optimize IS-IS network convergence.
Router A
! clns routing process-max-time 50 ip routing protocol purge interface router isis passive-interface Loopback0 net 49.1962.XXXX.XXXX.XXXX.00 is-type level-2-only ispf level-2 log-adjacency-changes ignore-lsp-errors metric-style wide level-2 external overload signalling !Configure on Cisco 12000 series Internet routers set-overload-bit on-startup 180 max-lsp-lifetime 65535 lsp-refresh-interval 65000 spf-interval 5 1 50 prc-interval 5 1 50 lsp-gen-interval 5 1 50 no hello padding authentication mode md5 level-2 authentication key-chain ON mpls traffic-eng router-id Loopback0 mpls traffic-eng level-2 ! interface GigabitEthernet x/x/x negotiation auto ip router isis mtu 4470 isis network point-to-point isis metric <metric> level-2 isis circuit-type level-2-only isis authentication mode md5 level-2 isis authentication key-chain ON carrier-delay ms 0 dampening interface POSx/y/x carrier-delay msec 0 dampening ip router isis no peer neighbor-route isis metric 1 level-2 isis circuit-type level-2-only isis authentication mode md5 level-2 isis authentication key-chain ON pos ais-shut pos report lais pos report lrdi pos report pais pos report prdi pos report slos pos report slof ! key chain ON key 1 key-string mypassword
Where to Go Next
To configure features to improve IS-IS network convergence times, complete the optional tasks in one or more of the following modules:
Additional References
Related Documents
| Related Topic |
Document Title |
|---|---|
| IS-IS commands: complete command syntax, command mode, defaults, command history, usage guidelines, and examples |
Cisco IOS IP Routing: ISIS Command Reference |
| Overview of Cisco IS-IS conceptual information |
"Overview of IS-IS Fast Convergence" |
| Cisco IOS master command list, all releases |
Standards
| Standard |
Title |
|---|---|
| No new or modified standards are supported, and support for existing standards has not been modified. |
-- |
MIBs
| MIB |
MIBs Link |
|---|---|
| No new or modified MIBs are supported by this feature, and support for existing MIBs has not been modified by this feature. |
To locate and download MIBs for selected platforms, Cisco IOS XE software releases, and feature sets, use Cisco MIB Locator found at the following URL: |
RFCs
| RFC |
Title |
|---|---|
| No new or modified RFCs are supported, and support for existing RFCs has not been modified. |
-- |
Technical Assistance
| Description |
Link |
|---|---|
| The Cisco Support and Documentation website provides online resources to download documentation, software, and tools. Use these resources to install and configure the software and to troubleshoot and resolve technical issues with Cisco products and technologies. Access to most tools on the Cisco Support and Documentation website requires a Cisco.com user ID and password. |
Feature Information for Setting Best Practice Parameters for IS-IS Fast Convergence
The following table provides release information about the feature or features described in this module. This table lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature.
Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.
| Table 1 | Feature Information for Setting Best Practice Parameters for IS-IS Fast Convergence |
| Feature Name |
Releases |
Feature Information |
|---|---|---|
| Setting Best Practice Parameters for IS-IS Fast Convergence |
Cisco IOS XE Release 2.1 |
This feature was introduced on the Cisco ASR 1000 Series Aggregation Services Routers. |
Cisco and the Cisco logo are trademarks or registered trademarks of Cisco and/or its affiliates in the U.S. and other countries. To view a list of Cisco trademarks, go to this URL: www.cisco.com/go/trademarks. Third-party trademarks mentioned are the property of their respective owners. The use of the word partner does not imply a partnership relationship between Cisco and any other company. (1110R)
Any Internet Protocol (IP) addresses and phone numbers used in this document are not intended to be actual addresses and phone numbers. Any examples, command display output, network topology diagrams, and other figures included in the document are shown for illustrative purposes only. Any use of actual IP addresses or phone numbers in illustrative content is unintentional and coincidental.
Feedback