07-12-2014 09:45 AM
I tried to deploy a Active/Passive cluster yesterday with only partial success!
Things didn't work as expected. Sessions were forming but servers would work intermittently. At times it would change so that what was working, stopped, and what wasn't, started. Some services worked fine for some people throughout. And for others nothing worked. After 45 minutes of trying various things we rolled back and I got to wondering what I'd missed...
In the lab I'd modelled the set up fairly closely to the real world scenario;
Things I tried
My current working theory is that having both PAN devices (even though one is shutdown/passive) connected to the switch fabric over a single AE bundle caused traffic to get lost at L2. Is this possible? Perhaps I've missed something else. Either way I'd love to know what I got wrong and how it can be fixed.
Thanks for your time,
07-12-2014 02:51 PM
global counter is the best option to find out root cause.
Apart from that you can do packet capture on firewall to troubleshoot particular data stream. Even that is effective.
Further suggestion can be provided after results of this output.
07-13-2014 03:15 AM
My name is Simon!
Aside from that - I've been reading up and found that the scenario "Layer 3 Active/Passive with Link Aggregation" on page 80 of this document - Designing Networks with Palo Alto Networks Firewalls makes use of MC-LAG. I'm only using LAG. Could this be the problem?
07-13-2014 05:38 PM
Topologies are different, but both should be supported and none should have drops.
Global counter data would be really useful here.
07-17-2014 03:00 AM
To those of you interested - we successfully deployed these firewalls yesterday, after making a change to the topology.
We replaced the single LAG between the switch fabric with a LAG to each device.
For whatever reason this has solved the issue and we're no longer seeing dropped packets.
Thank you hshah for your help.
Here is the revised, working topology. I hope it helps someone else.
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