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    Monitoring GRE Tunnel Information


    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.


    To display information about GRE Tunnel policy lists:

    host1#show gre tunnel detail tunnelGre50
    GRE tunnel tunnelGre50 is Down
    Tunnel operational configuration
      Tunnel mtu is '10240'
      Tunnel source address is ''
      Tunnel destination address is ''
      Tunnel transport virtual router is source
      Tunnel checksum option is disabled 
      Tunnel sequence number option is disabled 
      Tunnel up/down trap is enabled 
      Tunnel-server location is 6/0
      Tunnel administrative state is Up
    Statistics    packets        octets       discards   errors
      Data rx     0              0            0          0          
      Data tx     0              0            0          0          
    GRE tunnel policy input routeGre25
      classifier-group gre6 entry 1
         0 packets, 0 bytes
         traffic-class best-effort 
         mark 4 mask 255
    GRE tunnel policy output routeGre35
      classifier-group gre14 entry 1
         0 packets, 0 bytes
         traffic-class best-effort 
         mark 4 mask 255


    Table 1 lists the show gre tunnel command output fields.

    Table 1: show gre tunnel Output Fields

    Field Name

    Field Description

    GRE tunnel policy input

    Policy for outbound traffic

    GRE tunnel policy output

    Policy for inbound traffic


    Name of traffic class


    Name of classifier group


    Identifier for the entry in the classifier group


    Number of packets


    Number of bytes


    ToS byte setting for the classifier control list


    Mask value corresponding to the ToS


    Related Documentation


    Published: 2014-08-14