Dell Brocade G620 Brocade 8.0.1 Fabric OS Command Reference - Page 175

configure The edge hold time configuration is a chip-based value and the configuration varies between 8 Gbps-capable, 16 Gbps-capable, and 32 Gbps-capable platforms. 8 Gbps-capable platform provides one register to store the edge hold time value and any change in this value will affect all ports in the chip. Therefore, the edge hold time configuration will not be changed for 8 Gbps-capable platform ports in a logical switch. The 8 Gbps-capable platform ports in a logical switch take the default edge hold time value (220 milliseconds) or the value configured in the default switch. Both 16 Gbps and 32 Gbps-capable platforms provide four registers to store the edge hold time configuration and therefore each port in a chip can be configured one of the four values. The edge hold time parameter is enabled by default with a value of 220 milliseconds. The following are the three predefined edge hold time values: 80 Low edge hold time (in milliseconds). 220 Medium edge hold time (in milliseconds). This is the default value. 500 High edge hold time (in milliseconds). User Defined A user-defined value may be defined in the range of 80 - 500 milliseconds in increments of one. This value is only applicable to the default switch. In a logical switch, the edge hold time configuration is updated only for 16 Gbps-capable ports. If 8 Gbps-capable ports are present in the logical switch, the SWCH-1025 RASLog message is triggered to indicate that 8 Gbps-capable ports are present and the edge hold time configuration will not change for these ports. F-Port Device Update Mode When enabled, this feature provides the ability to update NS entries when the base devices perform logout. This option can only be changed when a switch is disabled. In Fabric OS prior to 7.3.0, the details of devices logged in with FLOGI (base devices) with AL_PA 0x40 and 0xC0 are not propagated to NS or FCP unless the devices are registered with NS. Since they cannot be probed, devices with these AL_PAs must initiate NS registration. If they do register with NS and then later logout, there can be multiple LUNs losing access during login time because the logged out base device entry is not removed from NS. Furthermore, the logged out base device cannot login to the fabric again. Enabling this update mode ensures NS and login database consistency. Virtual Channel Settings VC Priority specifies the class of frame traffic given priority for a virtual channel. The switch enables fine-tuning for a specific application by configuring the parameters for eight virtual channels. The first two virtual channels are reserved for switch internal functions and are not available for modification. The default virtual channel settings have already been optimized for switch performance. Changing the default values can improve switch performance but can also degrade performance. Do not change these settings without fully understanding the effects of the changes. Brocade Fabric OS Command Reference 151 53-1004112-02