Monitoring GRE Tunnel Information
Purpose
Display information about GRE tunnels. The state keyword displays tunnels that are in a specific state: disabled, down, enabled, not-present, or up. The ip keyword to display tunnels associated with an IP address. To display information about a specific tunnel, include the name of the tunnel. To display information about tunnels on a specific virtual router, include the name of the virtual router.
Action
To display information about GRE Tunnel policy lists:
host1#show gre tunnel detail tunnelGre50GRE tunnel tunnelGre50 is DownTunnel operational configurationTunnel mtu is '10240'Tunnel source address is '0.0.0.0'Tunnel destination address is '0.0.0.0'Tunnel transport virtual router is sourceTunnel checksum option is disabledTunnel sequence number option is disabledTunnel up/down trap is enabledTunnel-server location is 6/0Tunnel administrative state is UpStatistics packets octets discards errorsData rx 0 0 0 0Data tx 0 0 0 0GRE tunnel policy input routeGre25classifier-group gre6 entry 10 packets, 0 bytestraffic-class best-effortmark 4 mask 255GRE tunnel policy output routeGre35classifier-group gre14 entry 10 packets, 0 bytestraffic-class best-effortmark 4 mask 255Meaning
Table 27 lists the show gre tunnel command output fields.