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[Includes video] How to forward traffic logs from an SRX device to JSA/STRM



Article ID: KB16224 KB Last Updated: 16 Mar 2020Version: 20.0

This article provides video and text instructions for configuring traffic logs on an SRX device to be forwarded to an external Syslog server, such as JSA/STRM via structured format. 

For other topics or more advanced logging, go to the SRX Getting Started main page.


How to send traffic logs (structured syslogs) from SRX to a JSA syslog server.


Go to the KBTV video or text instructions below:

Video format:


Text format:

The following example shows how to configure the SRX to forward traffic logs (data plane logs) to a JSA/STRM device (

The configuration for forwarding traffic logs to JSA/STRM requires the following:

  • mode = stream
  • format = structured
  • port = revenue port (which is any port but FXP0)

Important:  Logging in 'stream' mode requires traffic to be sent from a non-FXP0 interface (revenue port). Routing table adjustments may be necessary to prevent sending traffic logging to STRM out a FXP0 interface. For more information, refer to Setting the System to Stream Security Logs Through Revenue Ports.


Configuration on SRX

Step 1. Set the security log mode:

root@srx# set security log mode stream

Step 2. Set the security log format to sd-sylog, which is for structured syslog format:

root@srx# set security log format sd-syslog

Step 3. Set the security log source-address, which is the SRX IP address expected by JSA/STRM. Here we are using the IP address of an egress interface ge-0/0/0 on the SRX:

root@srx# set security log source-address

Step 4. Give the security log stream a name and category. In this case, the name is 'securitylog', and the 'all' category is specified.

root@srx# set security log stream securitylog category all

Step 5. Set the host IP address of the JSA or Syslog server device that will receive the traffic logs.

root@srx# set security log stream securitylog host

Step 6. Also, set the host port of the JSA/STRM that will collect the traffic logs.  This is the port that JSA/STRM is configured to listen on.  The default syslog port is 514.

root@srx# set security log stream securitylog host port 514


Note:  As indicated in the important note above, while using 'stream' mode logging, make sure the routing path from SRX to the JSA/STRM is not via FXP0.

    >show route

    inet.0: 9 destinations, 9 routes (9 active, 0 holddown, 0 hidden)
    + = Active Route, - = Last Active, * = Both *[Static/5] 00:21:02
                  > to via ge-0/0/0.0

When complete and a 'commit' is executed, and the configuration looks like this:

security {
    log {
        mode stream;
	format sd-syslog;
	stream securitylog {
            category all;
	    host {;
		 port 514;
set security log mode stream
set security log format sd-syslog
set security log source-address
set security log stream securitylog format sd-syslog
set security log stream securitylog category all
set security log stream securitylog host
set security log stream securitylog host port 514


Viewing SRX logs on JSA :

To view the logs, use a browser and log into the JSA WebUI. Select the 'Log Activity' tab. Then select 'Real Time (streaming)' under the 'Viewing real time flows' pull-down.

Modification History:
2020-03-16: Changed STRM to include JSA/STRM and corrected an incorrect CLI.

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