With VRF-lite, multiple customers can share one CE. Provider routers (or core routers) are any routers in the service provider network that do not attach to CE devices. With other PE routers by using internal BGP (iBGP). After learning local VPN routes from CEs, a PE router exchanges VPN routing information Multiple interfaces on a PE router can be associated with a single VRF if all of these sites participate in the same VPN.Įach VPN is mapped to a specified VRF. Each PE router maintains a VRF for each of its directly connected sites.
PE to maintain all of the service provider VPN routes.
The PE is only required to maintain VPN routes for those VPNs to which it is directly attached, eliminating the need for the Provider edge (PE) routers exchange routing information with CE devices by using static routing or a routing protocol such The CE device advertises the site’s local routes to the provider edge router and learns the remote VPN routesįrom it. VRF-lite interfaces must be Layer 3 interfaces.Ĭustomer edge (CE) devices provide customer access to the service provider network over a data link to one or more providerĮdge routers. Ports, or logical, such as VLAN SVIs, but a Layer 3 interface cannot belong to more than one VRF at any time. Interfaces in a VRF can be either physical, such as Ethernet
VRF-lite uses input interfaces to distinguish routes for different VPNs and forms virtual packet-forwarding tablesīy associating one or more Layer 3 interfaces with each VRF. VRF-lite is a feature that enables a service provider to support two or more VPNs, where IP addresses can be overlapped among
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