Global Import Maps

Global import maps enable BGP routes to be imported from the global BGP non-VPN RIB into the BGP RIB of a VRF based on a configured route map. You can use import maps as an automated mechanism that enables a subset of the Internet to be reachable from a VPN. This feature is intended to provide simplified central access to a limited number of centralized services in the provider network. Use this feature to import only a relatively small number (tens) of routes from the global domain into the VPNs, such as a small number of routes to DNS servers, content servers, management stations, and so on.

If instead you import the full Internet routing table into one or more VPNs, too much memory will be consumed because this action stores multiple copies of the full Internet routing table. To prevent an accidental misconfiguration, you must specify the maximum number of routes to be imported into a VRF when you configure global import. If you must provide access to the full Internet from a VPN, use the fallback global command.

global import map

• Use to apply a route map to a VRF to modify and filter routes imported to the BGP RIB of the VRF from the global BGP non-VPN RIB in the parent VR.
• You can specify that only IPv4 or only IPv6 routes are imported. By default, both types of routes are imported.
• Use the max-routes keyword to specify the maximum number of routes that you want to be imported into the local RIB. BGP generates a log message when the specified number of routes has been imported; no additional routes are imported.

  WARNING 02/11/2005 10:28:35 bgpRoutes (default,10.13.5.21): Maximum number of routes (5000) imported from global RIB into RIB of VRF foo.

• Changes to the maximum number of routes take effect immediately.
• Example

  host1:boston(config-vrf)#global import map routemap22 max-routes 512

• Use the no version to disable the importing of routes from the global BGP non-VPN RIB to the BGP RIB of the VRF.
• See global import map.

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