[j-nsp] Monitoring Connectivity Out Multiple Links

[Crist Clark]

I've got a site with multiple Internet links. I want to continuously
monitor Internet connectivity across all links although I only plan
to use one at a time for production traffic. This is fail over only,
not load balancing.

Just routing by link up or down is not sufficient. All of the links
terminate as Ethernet on the device, an SRX 240H, with switches
between it and the CPE.

I found the Real Time Monitoring (RPM) features in JUNOS, and it seemed
perfect. I could set up a few ICMP pings and HTTP GETs to some reliable
locations and then only fail over when the preferred ISP has more
failures than the backup(s).

But I'm having problems getting this to work. I thought I could set up
a routing instance with the default route out each ISP then set up a
RPM test associated with each routing instance, after all, the knobs
seem to be in place to do this, but it does not work. From the research
I've done, it seems that a forwarding routing instance won't actually
affect the packets originating on the host itself?

So what is the right way to do this? Am I on the right track? BTW, this
is running 10.0, but upgrading is definitely an option.
-- 

Crist Clark
Network Security Specialist, Information Systems
Globalstar
408 933 4387