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    Monitoring Detailed Configuration Information about Specified Tunnels

    Purpose

    Display detailed configuration information about specified tunnels.

    Action

    To display detailed configuration information about specified tunnel by IP address:

    Note: For L2TP tunnels configured with output IPv4 or IPv6 policy lists, the output of the show ip interface tunnel l2tp:tunnel-name and the show ipv6 interface tunnel l2tp:tunnel-name commands display only the forwarded packets and bytes fields, and the dropped packets and bytes fields in the rate-limit-profile section for policies with hierarchical parent groups under the IP policy output or IPv6 policy output headings, respectively, when scheduler profile–based computation of service session accounting is enabled. In such a case, the committed, conformed, exceeded, saturated, and unconditional packets and bytes fields are not displayed in the rate-limit-profile section in the output of these commands for policies with hierarchical parent groups.

    host1#show l2tp tunnel virtual router default ip 172.31.1.98
    L2TP tunnel 1/xyz is Up with 13 active sessions 
    L2TP tunnel 1/aol.com is Up with 13 active sessions
    L2TP tunnel 1/isp.com is Up with 13 active sessions
    L2TP tunnel 1/msn.com is Up with 13 active sessions
    L2TP tunnel 1/mv.com is Up with 12 active sessions
    5 L2TP tunnels found

    To display detailed configuration information about specified tunnel:

    host1#show l2tp tunnel detail 1/xyz 
    L2TP tunnel 1/xyz is Up with 13 active sessions
    Configuration
      Administrative state is enabled
      SNMP traps are enabled
    Tunnel address
      Transport ipUdp
      Virtual router default
      Local address 192.168.1.230, peer address 172.31.1.98
      Local UDP port 1701, peer UDP port: 1701 Tunnel status
      Effective administrative state is enabled
      State is established
      Local tunnel id is 14529, peer tunnel id is 34
      Host profile is none
      Tunnel is Up for: 12 days, 8 hours, 24 minutes, 23 seconds
    Sub-interfaces    total   active   failed
      Sessions        13      13       0
    Statistics    packets      octets       discards   errors
      Control rx  14           683          0          0
      Control tx  41           4666         0          0
      Data rx     67900944     67900944     0          0
      Data tx     67900944     67900944     0          0
    Control channel statistics
      Receive window size = 4
      Receive ZLB = 17
      Receive out-of-sequence = 0
      Receive out-of-window = 0
      Transmit window size = 4
      Transmit ZLB = 12
      Transmit queue depth = 0
      Retransmissions = 8 Tunnel operational configuration
      Peer host name is 'Juniper-POS'
      Peer vendor name is 'XYZ, Inc.'
      Peer protocol version is 1.1
      Peer firmware revision is 0x1120
      Peer bearer capabilities are digital and analog
      Peer framing capabilities are sync and async

    Meaning

     Table 1 lists the show l2tp tunnel command output fields.

    Table 1: show l2tp tunnel Output Fields

    Field Name

    Field Description

    Configuration

    Configured status of the tunnel enabled.

    Administrative state

    Administrative status of the enabled tunnel:

    • enabled—No restrictions on creation and operation of sessions for this tunnel
    • disabled—Router disabled existing sessions and will not create new sessions on this tunnel
    • drain—Router will not create new sessions on this tunnel

    SNMP traps

    Whether or not the router sends traps to SNMP for operational state changes.

    Tunnel address

    Tunnel address information.

    Transport

    Method used to transfer traffic.

    Virtual router

    Name of the virtual router on which the tunnel is configured.

    Local and peer addresses

    IP addresses of the local and remote ends of the tunnel. If the router is set up to ignore address and port changes in SCCRP packets, both the transmit and receive addresses are listed for the peer.

    Local and peer UDP ports

    UDP ports for the local and remote ends of the tunnel. If the router is set up to accept address and port changes in SCCRP packets, both the transmit and receive UDP ports are listed for the peer.

    Tunnel status

    Tunnel status information.

    Effective administrative state

    Most restrictive of the following administrative states: E Series router, destination, and tunnel. This setting, rather than the administrative state of the tunnel, determines whether the router can create new sessions on a tunnel or whether the sessions on a tunnel are disabled or not.

    State

    Status of the enabled tunnel:

    • idle
    • connecting
    • established
    • disconnecting

    Local and peer tunnel id

    Names the router used to identify the tunnel locally and remotely.

    Host profile

    Name of the L2TP host profile, if it is configured. Otherwise, the label “none” is displayed to specify that a host profile is not enabled.

    Tunnel is Up for

    Duration for which the tunnel is operationally up, which is denoted in terms of days, hours, minutes, and seconds.

    Sub-interfaces:

    Sub-interface information for the enabled tunnel:

    • total—Number of sessions that the router has created on this tunnel
    • active—Number of operational sessions on the tunnel
    • failed—Number of requests that did not reach an operational state

    Statistics

    Information about the traffic sent and received.

    Control channel statistics

    Tunnel control channel information.

    Receive window size

    Number of packets that the peer can transmit without receiving an acknowledgment from the router.

    Receive ZLB

    Number of acknowledgments that the router has received from the peer.

    Receive out-of-sequence

    Number of received control packets that were out of order.

    Receive out-of-window

    Number of packets that arrived at the router outside the receiving window.

    Transmit window size

    Number of packets that the router can transmit before receiving an acknowledgment from the peer.

    Transmit ZLB

    Number of acknowledgments that the router has sent to the peer.

    Transmit queue depth

    Number of packets that the router is waiting to send to the peer, plus the number of packets for which the peer has not yet acknowledged receipt.

    Tunnel operation configuration

    Information received from the peer when the tunnel was created.

     

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    Published: 2014-08-20