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, first 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]user@host# edit routing-options traceoptionsuser@host# set file all-packets-traceuser@host# set flag all
  2. Configure the filename for the IGMP trace file.
    [edit]user@host# edit protocols igmp traceoptionsuser@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 problems 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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