Question & Answer
Question
Why does topology viewer display a fabric with one switch and no connected devices, when that switch is known to have been part of another fabric grouping previously?
Cause
A Fabric probe may run at a time when maintenance or physical configuration changes are being performed on a Fabric environment (outside of TPC). This is a timing issue that can be avoided by disabling Fabric probes at times when physical cabling and configuration changes are planned.
Answer
Sample Topology viewer showing a completely empty fabric:
If this occurs this fabric entity can safely be deleted from the TPC Topology Viewer, as there are no devices associated with this fabric (all fabric-connected devices have been added into fabrics that exist). The fabric identifier (in parentheses) is the unique identifier which is assigned to one of the existing switches monitored by TPC. In this case, switch 100000051xxxxxxx was the affected device. It was erroneously isolated due to reconfiguring fiber cables in this environment while a probe was running.
To delete this entity: from the L0: Fabrics view in the topology viewer you can simply right-click and choose "remove from database". This will clear the empty view. If unsure whether it is safe to remove this entry, please contact IBM support. To diagnose this problem, TPC service logs and an export of the TPCDB T_RES_FABRIC2SWITCH table will be needed.
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Document Information
Modified date:
22 February 2022
UID
swg21903466