Prerequisites for tunnel configuration

The device cannot directly route a tunneled packet based on its destination address. The packet is sent to a tunnel-type service loopback group, which then delivers the packet to the forwarding module for Layer 3 forwarding. For the tunnel interface to forward and receive packets, you must configure a tunnel-type service loopback group on the device. For information about service loopback group, see Layer 2—LAN Switching Configuration Guide.