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CLI-based Configuration Guide - IP Unicast Routing

AR100, AR120, AR150, AR160, AR200, AR1200, AR2200, AR3200, and AR3600 V200R009

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Configuring Convergence Priorities for IS-IS Routes

Configuring Convergence Priorities for IS-IS Routes

Context

Devices allow you to configure the highest convergence priority for specific IS-IS routes so that these IS-IS routes will be converged first when a network topology changes.

The application rules of the convergence priorities for IS-IS routes are as follows:
  • Existing IS-IS routes are converged based on the priorities configured in the prefix-priority command.

  • New IS-IS routes are converged based on the priorities configured in the prefix-priority command.

  • If an IS-IS route conforms to the matching rules of multiple convergence priorities, the highest convergence priority is used.

  • The convergence priority of a Level-1 IS-IS route is higher than that of a Level-2 IS-IS route.

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run isis [ process-id ]

    The IS-IS view is displayed.

  3. Run prefix-priority [ level-1 | level-2 ] { critical | high | medium } { ip-prefix prefix-name | tag tag-value }

    Convergence priorities are set for IS-IS routes.

    By default, the convergence priority of 32-bit host routes is medium, and the convergence priority of the other IS-IS routes is low.

    NOTE:

    The prefix-priority command is only applicable to the public network.

    After the prefix-priority command is run, the convergence priority of 32-bit host routes is low, and the convergence priorities of the other routes are determined as specified in the prefix-priority command.

  4. (Optional) Run quit

    The system view is displayed.

  5. (Optional) Run ip route prefix-priority-scheduler critical-weight high-weight medium-weight low-weight

    The preference-based scheduling ratio of IPv4 routes is configured.

    By default, the preference-based scheduling ratio of IPv4 routes is 8:4:2:1.

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Updated: 2019-05-17

Document ID: EDOC1000174069

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