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DES-7200 Configuration Guide Chapter 2 Configuring BGP IP VPN
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2.5.12 MPLS VPN over GRE
2.5.12.1 Networking requirements
In an IP core network, the edge router of PE supports MPLS VPN. Now it is required to use
"MPLS VPN over GRE" to use the IP core network to provide MPLS VPN service for users. The
IP core network adopts dual OSPF instances to introduce VPN traffic into the GRE tunnel, while
PE and CE exchange routes via OSPF.
2.5.12.2 Network topology
Fig 23 Network topology
2.5.12.3 Configuration tips
z Create GRE tunnel
z Configure IGP route