IP Addresses and Services Configuration Guide for Cisco 8000 Series Routers, IOS XR Releases

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IP Addresses and Services Configuration Guide for Cisco 8000 Series Routers, IOS XR Releases

Full-scale longest-prefix-match mode

Updated: August 12, 2026

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Explains how full-scale longest-prefix-match (LPM) mode reallocates memory and ternary content-addressable memory to maximize IPv4 and IPv6 route capacity.

Full-scale longest-prefix-match (LPM) mode is a hardware routing profile that

  • maximizes the supported IPv4 and IPv6 route scale

  • reallocates memory and ternary content-addressable memory resources, and

  • requires a manual chassis or line-card reload after a configuration change.

Table 1. Feature History Table
Feature Name Release Information Description

Full-scale route LPM mode

 Release 25.4.1

Introduced in this release on: Fixed Systems (8700 [ASIC: K100])(select variants only*)

*This feature is supported on Cisco 8711-48Z-M routers.
Full-scale route LPM mode Release 25.2.1

Introduced in this release on: Fixed Systems (8700 [ASIC:K100])

This feature enables you to increase the number of route entries supported for IPv4 and IPv6 traffic with the full-scale capability. You can now maximize the route scale for IPv4 and IPv6 traffic and this helps to reallocate hardware resources to support a higher number of routing entries.

CLI:

The full-scale keyword is introduced in the hw-module profile route scale lpm command.

This feature is supported on Cisco 8712-MOD-M routers.

Benefits of full-scale longest-prefix-match mode

Use full-scale LPM mode in environments that require extensive IPv4 and IPv6 routing tables.

Full-scale LPM mode provides these benefits:

  • Allocates more memory and ternary content-addressable memory to IP routes.

  • Supports larger service-provider or enterprise routing tables.

  • Uses the maximum LPM route capacity of the supported hardware.

Configure full-scale LPM mode

Maximize the IPv4 and IPv6 LPM route scale on supported hardware.

The default LPM profile operates in half-scale mode.

Procedure

  1. Configure full-scale LPM mode.

    Example:

    Router# config
Router(config)# hw-module profile route scale lpm full-scale
Router(config)# commit

  2. Reload the chassis or all affected line cards.

    Example:

    Router# reload location all

  3. Verify the route-scale profile.

    Example:

    Router# show hw-module profile route-scale
--------------------------------------------------------------
Knob                     Status           Applied     Action 
LPM-Full-Scale           Configured       Yes          None

The LPM full-scale profile reports a configured and applied state.

What to do next

To restore half-scale mode, remove the profile with the no form of the command and reload all locations.