Route Importation Control Overview

You can control how many routes a PE router can add to a particular VRF’s forwarding table by specifying a maximum limit and a warning threshold. When the router attempts to add a route, it compares the limit you configure against a route count it maintains for routes already in the VRF’s forwarding table.

With a warning threshold configured, the following behavior takes place when the PE router attempts to add a route:

With a limit configured, the following behavior takes place when the PE router attempts to add a route:

When you issue the command, the router immediately reevaluates the current number of routes against the new limit. If the current number of routes is greater than the maximum configured limit, the router might remove dynamically learned routes in order to enforce the new limit.

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