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    Troubleshooting PPP Interfaces

    Problem

    Description: To analyze and diagnose issues with the PPP interface, you must have access to detailed information on the most recent PPP operations. By default, nothing is traced.

    Solution

    For static PPP interfaces, you can configure a packet trace log for a PPP interface to diagnose issues on the PPP interface. First, specify a PPP interface which can be any one of the following interface types:

    • serial—Serial interface
    • atm—ATM interface
    • pos—Packet over SONET interface

    Note: For more information, see Interface Types and Specifiers in JunosE Command Reference Guide.

    host1(config-if)#log severity debug pppPacket serial 0/0:1/1 DEBUG 01/01/1970 00:16:58 pppPacket (1000001,*): interface:0/0:1/11/0:1,time: 0.00, tx lcp confReq, id = 226, length = 19, mru = 32759,authentication = chap MD5,magicNumber = 0x5387f9a2
    DEBUG 01/01/1970 00:16:58 pppPacket (1000001,*): interface: 0/0:1/11/0:1,time: 0.01, rx lcp confReq, id = 156, length = 18, mru = 32759,magicNumber = 0x2d8eac91, pfc, acfc
    DEBUG 01/01/1970 00:16:58 pppPacket (1000001,*): interface: 0/0:1/11/0:1,time: 0.01, tx lcp confAck, id = 156, length = 18, mru = 32759, magicNumber = 0x2d8eac91, pfc, acfc

    You can also configure logging to direct the output to a specific destination. For information, see Overview of System Logging.

    On dynamic PPP interfaces, you can use the ppp log command within the profile, as described in Configuring MLPPP and PPP Characteristics for a Profile. To enable PPP packet or state machine logging on any dynamic interface that uses the profile being configured, use one of the following keywords:

    • pppPacket—Enables PPP packet logging
    • pppStateMachine—Enables PPP state machine logging
    host1(config-profile)#ppp log pppPacket

    Note: This command is equivalent to the log severity debug pppPacket and log severity debug pppStateMachine commands.

     

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    Published: 2014-08-14