10-11-2016 12:59 AM - edited 03-08-2019 07:45 AM
Hello,
We have a test environment with 2 4500-x switches in VSS.
We have not configured any dual-active detection, however if we shutdown VSL links, Active switch goes to recovery mode and Standby switch becomes Active
How is it possible if no dual-active detection mechanism is configured?
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10-11-2016 01:34 AM
The docs say it can go into active /active mode it doesn't say it always will but with dual enabled it will protect it from that , its a good thing it has not gone onto active /active that means switch was able to work correctly in VSS mode though VSL without it enabled but I would still enable it as its best practice before it goes prod
10-11-2016 01:08 AM
Hi
VSS failover works without the dual-active detection as you seen all that's require in VSL setup between pair , dual active detection just prevents bot sups frm becoming active , if the VSL fails it initiates a failover but if the chassis is ok and dual-active is not in place you could end up with 2 active chassis causing an issue rather than an active standby which is whats expected after a failover
10-11-2016 01:26 AM
The thing is that Active switch goes into recovery when I shutdown ALL VSL links, it does not stay in active mode. So I dont really understand how both switches can become active
10-11-2016 01:34 AM
The docs say it can go into active /active mode it doesn't say it always will but with dual enabled it will protect it from that , its a good thing it has not gone onto active /active that means switch was able to work correctly in VSS mode though VSL without it enabled but I would still enable it as its best practice before it goes prod
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