Configuring Dynamic Tunnels

A VPN that travels through a non-MPLS network requires a GRE tunnel. This tunnel can be either a static tunnel or a dynamic tunnel. A static tunnel is configured manually between two PE routers. A dynamic tunnel is configured using BGP route resolution.

When a router receives a VPN route that resolves over a BGP next hop that does not have an MPLS path, a GRE tunnel can be created dynamically, allowing the VPN traffic to be forwarded to that route. Only GRE IPv4 tunnels are supported.

To configure a dynamic tunnel between two PE routers, include the dynamic-tunnels statement:

dynamic-tunnels tunnel-name {destination-networks prefix;source-address address;tunnel-type type-of-tunnel;}

You can configure this statement at the following hierarchy levels:

[edit routing-options]
[edit routing-instances routing-instance-name routing-options]
[edit logical-systems logical-system-name routing-options]
[edit logical-systems logical-system-name routing-instances routing-instance-name routing-options]

For more information about configuring routing options or BGP, see the Junos Routing Protocols Configuration Guide. For more information about VPNs, see the Junos VPNs Configuration Guide.