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The following methods enable advertising of Internet
routes to VPN sites and thus enable traffic flow from the VPNs to
the Internet:
- Configure default routes instead of a full default-free
Internet routing table in the VRF. The default routes must point to
a shared IP interface that you create on top of the layer 2 interface
that points to the Internet gateway.
- Configure a single full default-free Internet routing
table in the context of the parent VR and share this one table among
all VRFs with the fallback global feature. Fallback global enables
an additional lookup in the IP routing table of the parent VR in the
event that the IP route lookup in the child VRF fails.
- When reachability to a small number of networks in the
Internet is required, then configure a global import map to import
only the specific route to these networks into the VRF.
You can create multiple IP interfaces on top of
a single layer 2 interface. One of those interfaces is the primary
IP interface for receiving and sending IP packets. The other interfaces
are shared IP interfaces that are used only to send traffic.
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