HP Virtual Connect 4Gb Fibre Channel Module for c-Class BladeSystem - Manual (Page 153)

Configuring the Virtual Connect domain using the CLI 153
o Procurve Loop Protect frames
When the network loop protection feature is enabled, any probe frame or other supported loop detection
frame received on a downlink port is considered to be causing the network loop, and the port is disabled
immediately until an administrative action is taken. The administrative action involves resolving the loop
condition and clearing the loop protection error condition. The "loop detected" status on a port can be
cleared by one of the following administrative actions:
• Restart loop detection by issuing "reset" loop protection from the CLI or GUI
• Unassign all networks from the port in "loop detected" state
The SNMP agent supports trap generation when a loop condition is detected or cleared.
Virtual Connect provides the ability to enable or disable network loop protection. The feature is enabled by
default and applies to all VC-Enet modules in the domain. Network loops are detected and server ports can
be disabled even prior to any enclosure being imported.
A loop-protect reset command resets and restarts loop detection for all server ports in a “loop-detected” error
condition.
Server blade power on and power off guidelines
Certain server profile changes require the server blade in the device bay to be powered off before the
change can be made. HP recommends that administrators power off servers with the server console before
attempting such operations within the Virtual Connect Manager.
If any changes are made to a server profile that require modifications to the server, the server blade must be
powered off. Network or fabric changes do not require the server blade to be powered off. Server side
settings include the following:
• Assigning a VC- or user-defined MAC address
• Changing the PXE setting
• Assigning a VC-defined WWN
• Changing the Fibre Channel boot parameters
• Changing iSCSI boot parameters
• Adding or deleting a connection of any kind
If any of the listed settings are changing, the server must be powered off before the profile action can occur.
If the server blade is not powered off, a message appears and no changes are made. In this case, power off
the server blade and repeat the action.
When server side settings are changing, the following operations require that server blades be powered off:
• Assigning a profile to a server blade already installed in a device bay
• Deleting a profile, moving a profile to a different device bay, or unassigning a profile from the existing
bay
• Making modifications to a profile that affect settings on the server blade; for example, PXE
enable/disable, changing the number of connections, or changing Fibre Channel boot parameters
• Assigning a VC-assigned serial number
The following operations do not require the server blade to be powered off:
• Changing the network connected to an already defined Ethernet port