Allied Telesis AT-S102 - Manual (Page 34)

Chapter 1: AT-CV5M02 Management Card
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This is set on a per-slot basis. A line card in a slot where auto-copy is
enabled always obtains its parameter settings from the master
configuration file on the management card. Thus, a replacement AT-CM3
Line Card is automatically assigned the same settings as its predecessor.
You can also restore previous configurations manually to the AT-CM3 Line
Cards. You may find this valuable if you replace a line card in a slot where
auto-copy is disabled. After installing the new line card, you can instruct
the management card to send the previous configuration to the card.
You can also restore previous configurations to the AT-CM2 Line Cards
using auto-copy, just as you can with the AT-CM3 Line Card. When one of
these line cards is installed in a chassis slot where the auto-copy feature is
enabled, it receives its configuration from the management card whenever
it is reset or powered on.
However, you cannot manually restore configurations to the AT-CM2 Line
Cards. They do not support that feature. So if you install a replacement
AT-CM2 Line Card in a slot where auto-copy is disabled and you want the
new card to have the same configuration as the previous card, you have to
manually configure it.
When the management card restores a configuration to a line card, it
takes the configuration not from the master file in DRAM, but from the file
in flash memory. So keeping that file up-to-date is important. Otherwise,
the line cards could receive incomplete or out-of-date configurations. The
best way to do that is to always remember to save your changes
whenever you configure the line cards, as explained in “Saving Your
Configuration Changes” on page 78.
The configuration of a line card in the master configuration file includes the
active or inactive state of a card’s DIP switches. These switches are an
alternative method for setting the operating mode of a line card. As such,
when a line card receives a new configuration from the management card,
the card’s method for setting its operating mode along with the operating
mode itself may change. For example, if you have a line card whose DIP
switches are active and you restore to it a previous configuration where
the operating mode is controlled by the management software, the card’s
DIP switches will be deactivated and its operating mode will be
determined by the management software.
Here is an overview of the configuration process that occurs when an
AT-CM2 or AT-CM3 Line Card is installed in an active chassis or when a
chassis is powered on:
1. The line card initializes its management software, a process that takes
approximately one minute to complete. During this process the line
card uses the default values for its parameter settings to forward
network traffic through its ports.