Network OS Administration Guide

Supporting Network OS 6.0.1a

Part Number: 53-1003768-04

Modified Managed Fabric Name Monitoring mode

Modified Managed Fabric Name Monitoring (M-MFNM) mode prevents connections from the AG VDX switch to multiple SANs to ensure that all N_Ports in a port group connect to the same FC fabric.

Modified Managed Fabric Name Monitoring (M-MFNM) mode is enabled with LB mode. It queries the FC fabric name for a default time out value of 120 seconds. If it detects an inconsistency, for example all the N_Ports within a port group are not physically connected to the same physical or virtual FC fabric, the following occurs:
  • N_Ports are disabled to the fabric with the lower number of connected N_Ports.
  • If more than one fabric has the same or the maximum number of ports connected, N_Ports are disabled to the fabric with the higher "fabric names" (WWN of the Principal Switch). Ports connected to the lowest "fabric name" stay online.
Consider the following about M-MFNM mode:
  • M-MFNM mode is enabled by default when you enable LB mode. You cannot disable it unless you disable LB mode.
  • You can change the default time out value (tov) for fabric name queries using the timeout fnm value when in ag configuration mode. Refer to Setting the Fabric Name Monitoring TOV.