Cisco Headend System Release 2.5 用户指南
78-738186-01 Rev B
signonCount Utility
2-1
Chapter 2
signonCount Utility
Overview
Introduction
When DHCTs download new software for the operating system and resident
application, they lose the contents of their volatile memory. After the download,
DHCTs sign back on to the network and their network configuration data is
reloaded. The signonCount utility is useful in monitoring the rate at which DHCTs
sign on to the network.
Because some DHCTs make repeated attempts to sign on to the network before they
Because some DHCTs make repeated attempts to sign on to the network before they
are successful, too many sign-on attempts by DHCTs contribute to network
congestion. The signonCount utility can help system operators quickly identify those
DHCTs that are having trouble signing on, and the utility can then be used to
facilitate the DHCT sign-on process.
When to Use the signonCount Utility
The signonCount utility enables system operators and Cisco engineers to monitor
the rate at which DHCTs sign on to the network. This monitoring is required in the
following circumstances:
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•
When DHCTs download new software—DHCTs lose the contents of their volatile
memory when the DHCT downloads new software for the operating system and
resident application. DHCTs reconnect to the network after the download, and the
memory that contained information about the DHCT network connection
(IP address, transmit timing and level) is re-loaded. For systems that are forced to
rapidly load DHCT software, the signonCount utility is useful in determining
when to trigger the next group of DHCTs to load code.
•
When the QPSK modulator and demodulator software is upgraded—In this case,
the signonCount utility is used in the following two situations:
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The first situation is to determine if the system is healthy enough to be
upgraded. If it is not, the signonCount utility also provides a secondary mode of
operation that can dramatically improve the health of the system prior to
moving forward with the upgrade.
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The second situation is to use the signonCount utility to provide more
meaningful guidance regarding when you can move forward with upgrading
the next QPSK modulator. Previous upgrade guides instructed you either to
wait a little while between upgrading units or to monitor the log file, but they
offered no real tools to help in this effort.