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DES-7200 Configuration Guide Chapter 2 Configuring BGP IP VPN
2-59
Fig 21 Dual IGP instances
The scenario of dual routing instances divides the network into different layers and boasts better
scalability. The following example is mainly based on this scenario.
Typical application
Establish a GRE tunnel between PEs
Fig 22 Scenario I: PE-PE
As shown in Fig 22, the core network between PEs is completely an IP network. GRE tunnel is
established between two PEs, and the LSP between PE1 and PE2 has only one hop.