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DES-7200 Configuration Guide Chapter 2 Configuring BGP IP VPN
2-61
As shown in Fig 24, the network between PE1 and P doesn't support MPLS. The LSP is
connected by establishing a GRE tunnel between PE1 and P device.
2.3.4.3 Protocol specification
z RFC 4023: Encapsulating MPLS in IP or GRE.
z RFC 4797: Use of Provider Edge to Provider Edge (PE-PE) Generic Routing Encapsulation
(GRE) or IP in BGP/MPLS IP Virtual Private Networks.
2.3.4.4 Configuration steps
The configuration of MPLS VPN over GRE involves:
z Create tunnel interface
z Configure IGP route
z Configure MPLS network
z Configure MPLS VPN
Create tunnel
Execute the following command to create GRE tunnel (interface).
Command Function
DES-7200(config)# interface tunnel
tunnel-id
Create tunnel interface.
DES-7200(config)# tunnel mode gre
ip
Configure the tunnel as GRE in IP tunnel.
DES-7200(config-if)# ip address
ip-address address-mask
Configure the address for tunnel interface.
DES-7200(config-if)# tunnel source
{ip-address | interface-name}
Configure the source address of GRE tunnel.
DES-7200(config-if)# tunnel
destination ip-address
Configure the destination address of GRE
tunnel.
DES-7200(config-if)# no shutdown
Enable interface.