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:
You can configure this statement at the following hierarchy levels:
[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]