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    Tracing IGMP Protocol Traffic

    Tracing operations record detailed messages about the operation of routing protocols, such as the various types of routing protocol packets sent and received, and routing policy actions. You can specify which trace operations are logged by including specific tracing flags. The following table describes the flags that you can include.

    Flag

    Description

    all

    Trace all operations.

    client-notification

    Trace notifications.

    general

    Trace general flow.

    group

    Trace group operations.

    host-notification

    Trace host notifications.

    leave

    Trace leave group messages (IGMPv2 only).

    mtrace

    Trace mtrace packets. Use the mtrace command to troubleshoot the software.

    normal

    Trace normal events.

    packets

    Trace all IGMP packets.

    policy

    Trace policy processing.

    query

    Trace IGMP membership query messages, including general and group-specific queries.

    report

    Trace membership report messages.

    route

    Trace routing information.

    state

    Trace state transitions.

    task

    Trace task processing.

    timer

    Trace timer processing.

    In the following example, tracing is enabled for all routing protocol packets. Then tracing is narrowed to focus only on IGMP packets of a particular type. To configure tracing operations for IGMP:

    1. (Optional) Configure tracing at the routing options level to trace all protocol packets.
      [edit routing-options traceoptions]user@host# set file all-packets-traceuser@host# set flag all
    2. Configure the filename for the IGMP trace file.
      [edit protocols igmp traceoptions]user@host# set file igmp-trace
    3. (Optional) Configure the maximum number of trace files.
      [edit protocols igmp traceoptions]user@host# set file files 5
    4. (Optional) Configure the maximum size of each trace file.
      [edit protocols igmp traceoptions]user@host# set file size 1m
    5. (Optional) Enable unrestricted file access.
      [edit protocols igmp traceoptions]user@host# set file world-readable
    6. Configure tracing flags. Suppose you are troubleshooting issues with a particular multicast group. The following example shows how to flag all events for packets associated with the group IP address.
      [edit protocols igmp traceoptions]user@host# set flag group | match 232.1.1.2
    7. View the trace file.
      user@host> file list /var/loguser@host> file show /var/log/igmp-trace
     

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    Modified: 2015-04-12

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