Technical data

LLC2 SAP LINK

Format

"LLC2 SAP sap-name LINK link-name"

sap-name

Speciﬁes the name of the SAP whose link is to be traced.

link-name

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

Description

This traces all data-link PDUs transmitted and received by the LLC2 Module

on the speciﬁed link. Table B–2 lists the events that are recognized at this

tracepoint.

Table B–2 LLC2 SAP LINK Trace Events for VAX P.S.I.

Trace Event Description

RX Receive

TX Transmit

0020 Acknowledge Timer expired

0021 Poll Timer expired

0022 Reject Timer expired

0023 Busy Timer expired

0025 Retry Maximum reached

Example

$ TRACE START/LIVE "LLC2 SAP LINK lan-0"/PROTOCOL=LLC2"

produces the following output:

-----------+----+-----+<-----802.2 Frame Header----->+

Time |Evnt|Data |Dst Src C P Type N N |

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

-----------+----+-----+<-----------------------------+

14:58:12.60|TX | 22| 7E 7E R I 1/1 |

14:58:13.12|RX | 4| 7E 7E R RR 2/ |

14:58:13.50|RX | 15| 7E 7E R I 2/1 |

14:58:13.51|RX | 18| 7E 7E R I 2/2 |

14:58:13.52|RX | 8| 7E 7E R I 2/3 |

14:58:13.68|TX | 7| 7E 7E R I 4/2 |

14:58:14.02|TX | 7| 7E 7E R I 4/3 |

14:58:14.13|RX | 10| 7E 7E R I 4/4 |

14:58:14.15|RX | 55| 7E 7E R I 4/5 |

14:58:14.23|TX | 7| 7E 7E R I 6/4 |

14:58:14.25|TX | 7| 7E 7E R I 6/5 |

14:58:14.26|RX | 9| 7E 7E R I 5/6 |

14:58:14.28|TX | 18| 7E 7E R I 7/6 |

14:58:14.30|TX | 7| 7E 7E R I 7/7 |

14:58:14.31|RX | 7| 7E 7E R I 7/7 |

14:58:14.39|RX | 19| 7E 7E R I 8/8 |

14:58:14.42|TX | 7| 7E 7E R I 9/8 |

14:58:14.92|RX | 4| 7E 7E R RR 9/ |

VAX P.S.I. Tracepoints B–3