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Complex MPLS VPNs

Complex MPLS VPNs. Using Advanced VRF Import and Export Features. Outline. Overview What Are Advanced VRF Features ? Configuring Selective VRF import Configuring Selective VRF Export Summary. Advanced VRF Features. Selective i mport

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Complex MPLS VPNs

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  1. Complex MPLS VPNs Using Advanced VRF Import and Export Features

  2. Outline • Overview • What Are Advanced VRF Features? • Configuring Selective VRF import • Configuring Selective VRF Export • Summary

  3. Advanced VRF Features • Selective import • This features allows you to specify additional criteria for importing routes into the VRF. Selective export • This features allows you to specify additional RTs attached to exported routes. • VRF route limit • This features allows you to specify the maximum number of routes in a VRF to prevent memory exhaustion on PE routers or denial-of-service attacks.

  4. Configuring Selective VRF Import • VRF import criteria might be more specific than just the match on the RT—for example: • Import only routes with specific BGP attributes (community, and so on). • Import routes with specific prefixes or subnet masks (only loopback addresses). • A route map can be configured in a VRF to make the route import more specific.

  5. Configuring Selective VRF Import (Cont.) Router(config-vrf)# import map route-map • This command attaches a route map to the VRF import process. • A route is imported into the VRF only if at least one RT attached to the route matches one RT configured in the VRF and the route is accepted by the route map.

  6. Configuring Selective VRF Import (Cont.)

  7. Configuring Selective VRF Export • Routes from a VRF might have to be exported with different RTs. • An example would be export management routes with particular RTs. • An export route map can be configured on a VRF: • This route map can set extended community RTs. • No other set operations can be performed by this route map.

  8. Configuring Selective VRF Export (Cont.) Router(config)# route-map name permit seq match condition set extcommunity rt extended-community-value [additive] • This command creates a route map that matches routes based on any route map conditions and sets RTs.

  9. Configuring Selective VRF Export (Cont.) router(config-vrf)# export map name • This command attaches a route map to the VRF export process. • All exported routes always get RTs configured with the route-target export command in the VRF. • A route that is matched by the export route map will have additional RTs attached.

  10. Configuring Selective VRF Export (Cont.)

  11. Summary • Two advanced VRF features were discussed: • Selective import • Selective export • Use the import map command to configure an import route map for VRF. • Use the export map command to attach a route map to the VRF export process.

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