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    Monitoring Dynamic GRE Tunnels

    Purpose

    Display information about a dynamic GRE tunnel or a list of dynamic GRE tunnels. You can specify the detail keyword to view detailed information about tunnels. You can specify the state keyword and the state of the tunnel (disabled, down, enabled, lower-down, not-present, up) to view the number of tunnels in a specific state. To view the state of a specific tunnel, specify a tunnel name. To view the number of tunnels associated with an IP address, specify an IP address. You can specify an IP address with the virtual-router keyword and the name of the virtual router to view the number of tunnels associated with an IP address on the virtual router.

    Action

    To display three dynamic GRE tunnels:

    host1:vr11#show gre tunnel
    GRE tunnel mobileIp-dynamic-1 is Up
    GRE tunnel mvpn-dynamic-2 is Up
    GRE tunnel mvpn-dynamic-3 is Down
    3 GRE tunnels found
    3 tunnels were created dynamic 

    To display the detail of a dynamically created GRE tunnel for the data MDT application:

    host1:vr11#show dvmrp tunnel detail mvpn-dynamic-1
    GRE tunnel mvpn-dynamic-1 is Up
    tunnel is dynamic
    Application is MVPN
    Tunnel operational configuration
      Tunnel mtu is '5000'
      Tunnel source address is '1.1.1.1'
      Tunnel destination address is '2.2.2.2'
      Tunnel transport virtual router is vr1
      Tunnel mdt is disabled
      Tunnel checksum option is disabled
      Tunnel sequence number option is disabled
      Tunnel up/down trap is enabled
      Tunnel-server location is 4/0
      Tunnel administrative state is Up
    Statistics    packets              octets               discards   errors
      Data rx     0                    0                    0          0
      Data tx     0                    0                    0          0
    1 GRE tunnel found 
    1 tunnel was created dynamically

    To display the detail of a dynamically created GRE tunnel for the Mobile IP application:

    host1:vr12#show gre tunnel detail mobileIp-dynamic-1
    GRE tunnel mobileIp-dynamic-1 is Up 
    tunnel is dynamic
    Application is Mobile-IP
    Tunnel operational configuration
      Tunnel mtu is '5000'
      Tunnel source address is '6.6.6.6'
      Tunnel destination address is '3.3.3.3'
      Tunnel transport virtual router is vr1
      Tunnel mdt is disabled
      Tunnel checksum option is disabled
      Tunnel sequence number option is disabled
      Tunnel key 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

    To display a summary of information about dynamic GRE tunnels:

    host1#show gre tunnel summary
    Administrative status    enabled    disabled
                             3          0
    Operational status       up         down       not-present
                             3          0          0 

    Meaning

    Table 1 lists the show gre tunnel command output fields.

    Table 1: show gre tunnel Output Fields

    Field Name

    Field Description

    GRE tunnel

    Name and state of the dynamic GRE tunnel:

    • Up—Tunnel is operational
    • Down—Tunnel is not operational
    • not-present—Tunnel is not operational, because the hardware (such as a line module) supporting the tunnel is inaccessible

    Application

    Name of the application that created the tunnel

    Tunnel mtu

    Value of the maximum transmission unit for the tunnel

    Tunnel source address

    IP address of the source of the tunnel

    Tunnel destination address

    IP address of the destination of the tunnel

    Tunnel transport virtual router

    Name of the virtual router associated with the tunnel

    Tunnel mdt

    State of the tunnel MDT

    Tunnel checksum option

    State of the checksum feature: enabled or disabled

    Tunnel sequence number option

    State of the sequence number feature; enabled or disabled

    Tunnel up/down trap

    Indicates whether or not the E Series router sends traps to SNMP when the operational state of the tunnels changes, enabled or disabled

    Tunnel server location

    Location of the tunnel server in slot/port format (ERX7xx models, ERX14xx models, and the ERX310 router) or slot/adapter/port format (E120 and E320 routers).

    Tunnel is secured by ipsec transport interface

    IPsec interface that secures the tunnel

    Tunnel administrative state

    Configured state of the tunnel: up or down

    Statistics

    Details of packets received or transmitted by the tunnel

    packets

    Number of packets received or transmitted by the tunnel

    octets

    Number of octets received or transmitted by the tunnel

    discards

    Number of packets not accepted by the tunnel

    Errors

    Number of packets with errors received or transmitted by the tunnel

    Data rx

    Received data

    Data tx

    Transmitted data

    Tunnels found

    Total number of GRE tunnels found

    Tunnels were created dynamic

    Number of tunnels created dynamically

    Administrative status

    Administrative status:

    • enabled—Tunnel is available for use
    • disabled—Tunnel is not available for use

    Operational status

    Operational status:

    • up—Tunnel is operational
    • down—Tunnel is not operational
    • not-present—Tunnel is not operational, because the hardware (such as a line module) supporting the tunnel is inaccessible

    Published: 2014-08-12