Monitoring the Running Status of GRE

In routine maintenance, you can run the GRE related display commands to view the GRE running status.

Run the display interface tunnel [ interface-number ] command to check the tunnel interface running status.
Run the display ip routing-table vpn-instance vpn-instance-name command to check the VPN routing table on the PE.
Run the display ip routing-table command to check the routing table on the CE.
Run the ping [ -a source-ip-address | -vpn-instance vpn-instance-name ] ^* host command to check whether two ends of the tunnel can communicate with each other.
Run the display keepalive packets count command to check the numbers of Keepalive messages and Keepalive response messages sent and received by a GRE tunnel interface.