Network Storm blocked PM864 TCP ports, How do I unblocked them?
We had a problem in our primary control network wich blocked the lower PM864 TCP ports (both of them). Only 2 of our 22 redundant controllers were affected. We are using 800xa versión 4.1 R11.
The only way that I know to unblock a TCP ports is to unpower the affected CPU, in this case de the lower one. Does anyone know another way?.
There is no loop protection in version 4, only detection.
More information is available in 3BSE060651 a document you can download from ABB SolutionsBank (you need to have an account enabled) or ABB Library (from within the ABB Intranet).
No ports are disabled for an indefinite time; but if storm threshold continues to be met; a new block will be made each time the previous block period expires.
If a storm only hit one out of two network paths; the RNRP Utility can be used to send an "unblock" command via the unaffected path.
If block "seem permanent" (no response on ping, ever, etc.), your controller may have crashed, etc. as the "storm protection" is no perfect guarantee for surviving a network storm. If backup batteries are intact, the controller log may survive the crash/reset and contain vital evidence about what went wrong, so try to collect it as soon as contact has been established again.
Don't hesistate to contact your regional ABB support center and ask for advise.