Dell PowerConnect Brocade M5424 Brocade 7.1.0 Fabric Watch Administrator's Gui - Page 90
Port fencing configuration, Port fencing recommended area settings
View all Dell PowerConnect Brocade M5424 manuals
Add to My Manuals
Save this manual to your list of manuals |
Page 90 highlights
7 Port fencing NOTE The execution of the portFencing command is subject to Virtual Fabric (VF) or Admin Domain restrictions that may be in place. For example, in non-VF chassis environments, the state change counter of a trunked slave port gets incremented by more than 1 when the master EX_Port changes its state. Therefore, it is advisable to set the port fencing high threshold for the State Change area to a value greater than 4 in this environment. The allowed threshold configuration settings are displayed on a per-class basis. FOP_Port class thresholds apply to the entire switch. You can set different thresholds for Storage and Host FOP_Ports if they are on different switches, based on the fabric configuration. Port fencing configuration You must configure port thresholds with the portThConfig command before you can enable port fencing using the portFencing command. See "portThConfig command procedures" on page 59 for example port configurations, or refer to the Brocade Fabric OS Command Reference Guide for complete inThreshold recommendations for CRC errors and Invalid Words. You can configure a specified port type or a list of port types to enable port fencing for one or more areas. Use the all option to indicate all port types or all areas. Port fencing recommended area settings Cyclic redundancy check (CRC) errors and invalid transmission words (ITW) can occur on normal links. They have also been known to occur during certain transitions such as server reboots. When these errors occur more frequently, they can cause a severe impact. While most systems can tolerate infrequent CRC errors or invalid words, other environments can be sensitive to even infrequent instances. The overall quality of the fabric interconnects is also a factor. NOTE For Fabric OS versions 7.1.0 and later, the ITW counter includes a physical coding sublayer (PCS) violation. ITW violations can occur due to an ITW violation, a PCS violation, or both. When establishing thresholds for CRC errors and Invalid Words, consider the following: • In general, "cleaner" interconnects can have lower thresholds as they should be less likely to introduce errors on the links. • Moderate (recommended), conservative and aggressive threshold recommendations are provided in Table 21. After selecting the type of thresholds for an environment: - Set the low threshold with an action of ALERT (RASlog, e-mail, SNMP trap). The alert will be triggered whenever the low threshold is exceeded. - Set the high threshold with an action of Fence. The port will be fenced (disabled) whenever the high threshold is detected. • Aggressive threshold suggestions do not include settings for low, and instead only have the high values to trigger fencing actionformation on the portThConfig command. Table 21 shows the recommended moderate, aggressive, and conservative thresholds for supported port fencing areas. 70 Fabric Watch Administrator's Guide 53-1002752-01