After a tunnel policy is applied to a VPN service, the system will flexibly select a tunnel based on the policy, increasing tunnel selection diversity.
By default, the system selects LSPs to transmit VPN data without performing load balancing, which cannot meet VPN requirements in the following situations:
GRE or TE tunnels need to be selected for VPN service transmission.
Load balancing among tunnels needs to be implemented to fully utilize network resources when multiple tunnels are available for VPN service transmission.
Some VPN services demand Quality of Service (QoS) guarantee and must be carried by dedicated TE tunnels.
In these situations, tunnel policies need to be configured and applied to VPNs. The following types of VPNs can apply tunnel policies:
The mode in which a tunnel policy is applied to a VPN instance varies according to the VPN type.
Before configuring and applying a tunnel policy, complete the following tasks:
Establish the basic network for VPNs of different types.