24.12.2 Limit on the number of routes

(1) Suppressing the addition of routes

When the number of routes per VRF exceeds the specified maximum number of routes, the Switch suppresses subsequently learned routes to be added to the forwarding table.

The suppressed routes are retained in the routing table and will be added sequentially when the routes that have been added are deleted, freeing up space in the forwarding table.

(2) Warning message output

When the number of routes per VRF exceeds the specified warning threshold or the maximum number of routes, a warning message is output.

Additional output of warning message 1, which is output when the warning threshold is exceeded, is suppressed until the number of routes drops below 80% of the warning threshold.

Additional output of warning message 2, which is output when the maximum number of routes is exceeded, is suppressed until the number of routes drops below the warning threshold.

The following figure shows the relationship between the number of routes and the output of warning messages.

Figure 24-11: Relationship between the number of routes and warning message output

(3) Notes

If you change the maximum number of routes in the configuration to a value smaller than the number of routes registered in the forwarding table, the number of routes registered in the forwarding table is not immediately reduced to the new maximum number of routes.

To forcibly reduce the number of routes registered in the forwarding table to the maximum number of routes that you specified, execute the clear ipv6 route operation command.