Tracing DVMRP 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.

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

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 DVMRP trace file.
   [edit]user@host# edit protocols dvmrp traceoptionsuser@host# set file dvmrp-trace
3. (Optional) Configure the maximum number of trace files.
   [edit protocols dvmrp traceoptions]user@host# set file files 5
4. (Optional) Configure the maximum size of each trace file.
   [edit protocols dvmrp traceoptions]user@host# set file size 1m
5. (Optional) Enable unrestricted file access.
   [edit protocols dvmrp traceoptions]user@host# set file world-readable
6. Configure tracing flags. Suppose you are troubleshooting problems with a particular DVMRP neighbor. The following example shows how to trace neighbor probe packets that match the neighbor’s IP address.
   [edit protocols dvmrp traceoptions]user@host# set flag neighbor | match 192.168.1.1
7. View the trace file.
   user@host> file list /var/loguser@host> file show /var/log/dvmrp-trace

Related Topics

• DVMRP Overview
• Junos OS Tracing and Logging Operations in the System Basics Configuration Guide