Tunnel Probe

A tunnel probe is used to monitor a tunnel endpoint IP address. A tunnel probe can be used in any tunnel mode. If a probe fails, the associated tunnel is taken down. A default ICMP tunnel probe exists named $tunnel_default or a probe can be configured using the tracked object manager probe facility. See Configuring a Probe for Server Load Balancing (S-Series) for configuration details for creating and configuring a probe.

Note

It is recommended that you use GRE keepalive to monitor a tunnel. GRE keepalive both monitors the state of the IP address and whether the end-point was able to decapsulate the tunnel packet. Tunnel probes are also supported. Do not configure both a GRE keepalive and tunnel probe.

Use the tunnel probe command, in tunnel configuration mode, specifying the tunnel destination address, to monitor the tunnel endpoint IP address.