Cisco Cisco Gigabit Ethernet Switch Module (CGESM) for HP Release Notes

If the number of VLANs times the number of trunk ports exceeds the recommended limit of 13,000, the 
switch can fail. The workaround is to reduce the number of VLANs or trunks. (CSCeb31087)

These are the device manager limitations and restrictions:

You cannot create and manage switch clusters through the device manager. To create and manage 
switch clusters, use the CLI. 

When you are prompted to accept the security certificate and you click No, you only see a blank 
screen, and the device manager does not launch. 

The workaround is to click Yes when you are prompted to accept the certificate. (CSCef45718)

These are the hardware limitations and restrictions:

When using CLC-T SFPs in CGESM switches, the SFP module can be installed too far into the switch. 
This can prevent links from operating properly.

The workaround is to slightly pull the SFP out of the module slot. (CSCsd17765)

These notes apply to the device manager:

We recommend that you use this browser setting to display the device manager from Microsoft Internet 
Explorer in the least amount of time. 

From Microsoft Internet Explorer:

Choose Tools > Internet Options. 

Click Settings in the “Temporary Internet files” area. 

From the Settings window, choose Automatically.

Click OK.

Click OK to exit the Internet Options window.

The HTTP server interface must be enabled to display the device manager. By default, the HTTP 
server is enabled on the switch. Use the show running-config privileged EXEC command to see if 
the HTTP server is enabled or disabled.