Cabletron Systems 9A656-04, Дополнение

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PVC Addendum to the 9A686-04/9A656-04 Configuration Guide
9033126-01 Page 5 of 43
Figure 3 provides an example of a user-defined ILMI configuration. In this example the user has
increased the minimum VCI value for SVCCs from the default value of 33 to 200. The maximum VPI
value for SVCCs has been set to 3, and the maximum VPI value for SVPCs has been set to 4. This limits
the range for SVCCs and SVPCs to the settings displayed in
Figure 3 .
Persistence
The procedures described in this document, by default, create permanent configurations for the interface
on which they were performed, which are defined as “persistent” configurations. These configurable
options are performed on an interface by interface basis via the AToM MIB. Before performing any of
these configurations, be aware that the only way to revert these settings to the factory default settings is to
clear NVRAM. Instructions on how to clear NVRAM can be found in the
9A686-04 Hardware and
Installation Guide and the 9A656-04 Hardware and Installation Guide . Pressing the RESET button on
the front of the module will NOT restore factory default settings after they have been changed.
Keep in mind that if the user turns off persistence (described later in this document), ALL PVCs created
on this ENTIRE chassis will be lost if ANY module in the SmartSwitch 9500 chassis resets.
!
CAUTION
Before making any changes to the ILMI Configuration Menu screen, refer to the
following two examples of what can happen if ILMI settings are changed
indiscriminately:
The user sets the MIN SVCC VCI field to 2000. However, a third party ATM Uplink
device is attached to this SmartSwitch 9500, and this uplink device only supports a
VCI range of 0 through 1064. In this case, the ATM Uplink device would NOT be able
to establish ANY SVCs with the SmartSwitch 9500.
The user MUST be aware of the
VPI/VCI ranges of ALL devices that connect to this SmartSwitch 9500 before
changing the ILMI parameters
.
The user sets the MIN CTM SVCC VCI field to 500. In this case, the user has allowed
only 11 VCI values to be reserved for SVCs across the CTM backplane of this
SmartSwitch 9500. Be aware that the VCI range for all CTM interfaces is 0 through
511.
If the user sets a value at or above 511 for this field, NO SVCs will be
created across the CTM backplane.