Configuration Library
Configuration Library

Ip tracking on a srx

‎10-23-2012 03:57 AM

Configuration example

Subject:                                               IP tracking for dual ISP on a srx
Junos version tested on:             12.1r3


As internet links come cheaper we see more and more sites with dual ISP connections. Very often this is implemented with a high quality mean link and a cheap(er) backup line.  When DSL or alike connections are used a failure occurs quite often at the WAN side of a router or DSL modem. A simple backup route in the routing table doesn’t help us in this case, the Ethernet side of the device stays up when the WAN side fails, so our SRX keeps the main route active. In the screenos devices  we could use iptracking on the interface to deal with this problem. We can do something similar with Junos on the SRX. A little more complex to configure, but with (way) more control over what should be checked.

On Junos devices you can use the rpm (Realtime Performance Monitoring, don’t get confused you redhat users) implementation to do the monitoring for you. You can setuo full rpm with latency monitoring or even url tracking, but also a “simple” tracking with a ping packet is possible. For ISP tracking and failover this should be enough.  We tested this and wrote this document about our findings.


See pdf for the complete document

best regards,

Juniper Ambassador, Instructor,JNCIP
If this worked for you please flag my post as an "Accepted Solution" so others can benefit. A kudo would be cool if you think I earned it.


Configuration Library

Re: Ip tracking on a srx

‎12-12-2013 11:54 PM

Hi Screenie,,


IP tracking option will support on high end SRX , I have read RPM probe will not support in the high end SRX .


Can you please confirm and any other option on high end SRX ?.


B.Regards ,



Configuration Library

Re: Ip tracking on a srx

‎12-26-2013 02:15 AM

Thanks good article, somewhere i would try may be .