Quirkiness with box to box redundancy.

I have several sets of CSS's running in box to box redundancy running version 5.03 Build 15.
My question is what causes one CSS to out of the blue go backup and the other become master? I've had this happen on just about all the ones I have configured for box to box. This one pair has been running for a little over a year without a problem and today failed over to the other CSS twice. Nothing shows up in the logs except the "transition to redundancy backup / master." Another pair did this several times about a year ago, after having ran for quite some time. I rebooted both units and they were fine for a period of about 6 months. I find this very strange and am curious if anyone else has had these same problems. I have updated the code on one set, the problem reappered about 7 months later.
I'm now deploying all new CSS installs using interface/vip redundancy.
Thanks!

the version you are using is a potential explanation.
I would really not recommend it.
You should either go to 5.0 or 6.10
Regarding the problem you got, it could also be related to how you connected the CSS together.
Do you have a straight connection between the 2 ? or do you use a switch ?
If a switch, something could have happened there.
Gilles.

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if it was 2 different 5.0 release, I would say ok.
But a 5.0 and a 6.1 release, it could be ok but that's not 100% sure.
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Use the redundancy-l4-stateless command in content or group configuration mode to enable stateless redundancy failover in a box-to-box redundancy or a VIP and virtual interface redundancy configuration. Stateless redundancy failover allows critical TCP/IP traffic to continue in case of a failure at the load-balancing CSS by allowing the backup CSS to set up a mid-stream TCP flow. This feature is disabled by default.
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customer will use 2 Css 11503 and wants to configure box-to-box redundancy.
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Dietrich,
initially it was necessary for this link to be FE.
With the most recent versions this link can also be a GE link.
Since this link is only being used for some kind of keepalive between the 2 CSS, I don't see the need to use GigE.
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