Technical data

LAPB LINK

Format

"LAPB LINK link-name"

link-name

Speciﬁes the name of the LAPB LINK entity to be traced.

Description

This traces all data link PDUs transmitted and received by the speciﬁed LABP

LINK entity. Table B–1 lists the events that are recognized at this tracepoint.

Table B–1 LAPB LINK Trace Events for VAX P.S.I.

Trace Event Description

RX Receive

TX Transmit

0020 Acknowledge Timer expired

0023 Retry Maximum reached

0024 Flush issued to line

0026 Line has come up

0027 Line has come down

0028 Line reset sent to device driver

Example

$ TRACE START/LIVE "LAPB LINK dsv-0"/PROTOCOL=LAPB

produces the following output:

-----------+----+-----+<--------Frame-------->+

Time |Evnt|Data |Ad P Type N N |

hh mm ss cc| |Size | F R/S R/S |

-----------+----+-----+<--------------------->+

14:54:22.24|TX | 15| C I 1/1 |

14:54:22.30|RX | 2| R RR 2/ |

14:54:23.25|RX | 5| C I 2/1 |

14:54:23.25|TX | 2| R RR 2/ |

14:54:23.27|RX | 16| C I 2/2 |

14:54:23.27|TX | 2| R RR 3/ |

14:54:23.28|RX | 6| C I 2/3 |

14:54:23.28|TX | 2| R RR 4/ |

14:54:23.38|TX | 5| C I 4/2 |

14:54:23.39|RX | 2| R RR 3/ |

14:54:23.67|TX | 5| C I 4/3 |

14:54:23.68|RX | 2| R RR 4/ |

14:54:23.80|TX | 16| C I 4/4 |

14:54:23.83|RX | 2| R RR 5/ |

14:54:23.85|RX | 5| C I 5/4 |

14:54:23.85|TX | 2| R RR 5/ |

14:54:24.14|RX | 8| C I 5/5 |

14:54:24.14|TX | 2| R RR 6/ |

B–2 VAX P.S.I. Tracepoints