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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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Displaying and Maintaining the Routing Management Module

Displaying and Maintaining the Routing Management Module

Procedure

  • Run the display rm interface [ interface-type interface-number ] command to check IPv4 routing management (RM) information on the specified interface.
  • Run the display rm ipv6 interface [ interface-type interface-number ] command to check IPv6 RM information on the specified interface.
  • Maintaining the RM Module

    Configure a limit on the number of public route prefixes.

    1. Run system-view

      The system view is displayed.

    2. Run either of the following commands as required:
      • Run ip prefix-limit number { alert-percent [ route-unchanged ] | simply-alert }

        A limit on the number of IPv4 public route prefixes is configured.

        By default, the maximum number of IPv4 public route prefixes is not limited.

      • Run ipv6 prefix-limit number { alert-percent [ route-unchanged ] | simply-alert }

        A limit on the number of IPv6 public route prefixes is configured.

        By default, the maximum number of IPv6 public route prefixes is not limited.

      alert-percent indicates the percentage of the maximum number of public route prefixes that are supported. If you specify alert-percent in the command, an alarm is generated when the number of public route prefixes exceeds the value calculated by the following formula:

      (number x alert-percent)/100

      New public route prefixes can still be added to the routing table until the number of public route prefixes reaches the value of number. Subsequent route prefixes are then discarded.

      If you specify simply-alert in the command, new public route prefixes can still be added to the routing table and only an alarm is generated after the number of public route prefixes exceeds the value of number. However, when the total number of private and public route prefixes reaches the limit on the number of unicast route prefixes specified in the PAF file, subsequent public route prefixes are discarded.

      If you decrease the value of alert-percent after the number of public route prefixes exceeds the value of number, whether the routing table remains unchanged is determined by route-unchanged.
      • If you specify route-unchanged in the command, the routing table remains unchanged.

      • If you do not specify route-unchanged in the command, the system deletes all the routes from the routing table and re-adds routes.

      NOTE:
      After the number of public route prefixes exceeds the limit, note the following rules:
      • If you run the ip prefix-limit command to increase the value of number or run the undo ip prefix-limit command to delete the limit, the device relearns IPv4 public route prefixes.
      • If you run the ipv6 prefix-limit command to increase the value of number or run the undo ipv6 prefix-limit command to delete the limit, the device relearns IPv6 public route prefixes.
      • Direct and static routes can still be added to the IP routing table.
    3. (Optional) Run ip prefix-limit log-interval interval

      An interval at which the system generates logs after the number of public route prefixes exceeds the limit is configured.

      By default, the system generates logs at an interval of 5s after the number of public route prefixes exceeds the limit.

      You can run the command to set a longer interval to decrease the frequency at which these logs are generated.

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Updated: 2019-05-17

Document ID: EDOC1000174069

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