Support Support Downloads Knowledge Base Case Manager My Juniper Community

Knowledge Base

Search our Knowledge Base sites to find answers to your questions.

Ask All Knowledge Base Sites All Knowledge Base Sites JunosE Defect (KA)Knowledge BaseSecurity AdvisoriesTechnical BulletinsTechnotes Sign in to display secure content and recently viewed articles

[SRX] Physical stream gets disabled after reboot



Article ID: KB35333 KB Last Updated: 11 Dec 2019Version: 1.0

This article explains why the physical stream may be disabled after SRX5k devices reboot, and indicates a workaround to resolve the issue. The article also lists the Junos OS releases in which the fix is available.


The physical stream could be disabled after reboot and cause user traffic disruption.


After a reboot, both the Routing Engine (RE) and the local I/O card on SRX5k devices will try to manage the physical streams during system bootup. In some race condition, the physical stream could be disabled accidentally.

This problem may occur more easily on fully loaded systems. Also, it is easier to trigger the issue if there are several SPCs and the problem may occur on any Services Processing Card (SPC). After the issue is triggered, it cannot be fixed without rebooting the system.


The problem has been fixed in Junos OS Release 12.3X48-D45, 12.3X48-D50, and 15.1X49-D30.

Meanwhile, to work around the issue, reboot the device. After rebooting the device, check the following four streams on each SPC from shell mode and make sure that they are all enabled.

Note: You can ignore any other streams that are disabled.

An example to check FPC3 on a standalone SRX5k device is given below. Make sure to add node0.fpc3 or node1.fpc3 in the case of a cluster setup:

root@srx>start shell
%cprod -A fpc3 -c "show xm 0 phy-stream 1024 1"
%cprod -A fpc3 -c "show xm 0 phy-stream 1028 1"
%cprod -A fpc3 -c "show xm 0 phy-stream 1180 1"
%cprod -A fpc3 -c "show xm 0 phy-stream 1184 1"

If these four streams are not enabled, reboot the system again.

The following is an output of a disabled stream.

root@srx% cprod -A fpc3 -c "show xm 0 phy-stream 1180 1"
================ fpc3 ================

Egress PHY stream structure

Stream number                 : 1186
Stream type                   : WAN
NIC slot                      : 3
PIC slot                      : 1
Enabled                       : No              
Connection number             : 6
Port number                   : 6
MAC mode                      : True
MAC port number               : 6
SGMII mode                    : False
1000Base-X/SGMII mode         : Invalid
SGMII Auto Negotiation        : Disabled
SGMII Speed                   : Invalid
SGMII mode                    : False
1000Base-X/SGMII mode         : Invalid
SGMII Auto Negotiation        : Disabled
SGMII Speed                   : Invalid
Port speed                    : 10G
Port group                    : 1
IFD count                     : 1
Scheduler                     : WAN
L1 scheduler node             : 14
Stream weight                 : 10

Comment on this article > Affected Products Browse the Knowledge Base for more articles related to these product categories. Select a category to begin.

Getting Up and Running with Junos

Getting Up and Running with Junos Security Alerts and Vulnerabilities Product Alerts and Software Release Notices Problem Report (PR) Search Tool EOL Notices and Bulletins JTAC User Guide Customer Care User Guide Pathfinder SRX High Availability Configurator SRX VPN Configurator Training Courses and Videos End User Licence Agreement Global Search