Configuring Thresholds for the Number of IPv4 Route Prefixes
This section describes how to configure thresholds (one alarm threshold and one clear alarm threshold) for the number of IPv4 route prefixes on a device. After the thresholds are configured, an alarm is generated when the number of IPv4 route prefixes on the device exceeds the alarm threshold, and the alarm is cleared when the number of IPv4 route prefixes falls below the clear alarm threshold. Configuring these thresholds facilitates maintenance.
Context
The number of IPv4 route prefixes that can be added to a routing table is limited. If the number exceeds the limit, new prefixes cannot be added to the routing table, which may interrupt services. To address this problem, configure an alarm threshold for the number of IPv4 route prefixes.
An alarm is generated when the following conditions are met:
- The number of IPv4 route prefixes on the device exceeds the alarm threshold.
Procedure
- Run system-view
The system view is displayed.
- Run ip prefix-limit system threshold-alarm upper-limit upper-limit-value lower-limit lower-limit-value
Two thresholds (one alarm threshold and one clear alarm threshold) are configured for the number of IPv4 route prefixes on the device.
When you configure upper-limit-value and lower-limit-value, note the following suggestions:- Set a value less than or equal to 95 for upper-limit-value.
- lower-limit-value must be less than upper-limit-value. Set lower-limit-value to a value at least 10 less than upper-limit-value to prevent alarms from being frequently generated and cleared due to route flapping.
- Run commit
The configuration is committed.