Network OS Administration Guide

Supporting Network OS 6.0.1a

Part Number: 53-1003768-04

N_Port monitoring for unreliable links

N_Port monitoring monitors links between N_Ports on the switch configured in Access Gateway mode and F_Ports on the connected FC fabric. When links are considered unreliable, the N_Port is disabled.

Links from all N_Ports are monitored for the number of online and offline static change notifications (SCNs) that occur during a five-minute period. If the number of SCNs on a link exceeds a set threshold, the link is considered unreliable, and the port is taken offline. VF_Ports mapped to the N_Port also go offline. Once the number of SCNs drops below the set threshold, the port is deemed reliable again and the N_Port and the mapped VF_Ports go back online.

The default threshold is 25 SCNs per 5 minutes. You can set from 10 to 100 SCNs per 5 minutes. While in ag command mode, you can use the counter reliability value command to modify the default threshold.