Configuring A Detection Interval; Clearing The 16-Bit Interface Indexes Not Used In The Current System - 3Com 4500G Family Configuration Manual

whether you press Ctrl+B or not, the system does not enter the Boot ROM menu, but enters the
command line configuration interface directly.
In addition, you need to set the Boot ROM access password when you enter the Boot ROM menu for
the first time to protect the Boot ROM against operations of illegal users.
You can use the display startup command to view the status of the Boot ROM access function. For the
detailed description of the display startup command, refer to File System Management in the System
Volume.
Follow the step below to disable Boot ROM access:
To do...
Disable Boot ROM access

Configuring a Detection Interval

Some protocol modules may shut down ports under specific circumstances. For example, an MSTP
module will automatically shut down a port that receives configuration messages after the BPDU guard
function is enabled on the port. Then, the device enables a detection timer and detects the status of the
port. If the port is still down when the detection timer times out, the device will automatically bring up the
port.
Follow these steps to configure a detection interval:
To do...
Enter system view
Configure a detection interval

Clearing the 16-bit Interface Indexes Not Used in the Current System

In practical networks, the network management software requires the device to provide a uniform,
stable 16-bit interface index. That is, a one-to-one relationship should be kept between the interface
name and the interface index in the same device.
For the purpose of the stability of an interface index, the system will save the 16-bit interface index when
a logical interface is removed.
If you repeatedly insert and remove delete a large number of logical interfaces, the interface indexes will
be used up, which will result in interface creation failures. To avoid such a case, you can clear all 16-bit
interface indexes saved but not used in the current system in user view.
After the above operation,
For a re-created interface, the new interface index may not be consistent with the original one.
For existing interfaces, their interface indexes remain unchanged.
Follow these steps to clear the 16-bit interface indexes not used in the current system:
Use the command...
undo startup
bootrom-access enable
Use the command...
system-view
shutdown-interval time
1-6
Remarks
Required
By default, Boot ROM access is
enabled.
Available in user view.
Remarks
—
Optional
The detection interval is 30
seconds by default.