Cabletron Systems 6000 - Manual (Page 69)

Chassis Configuration Screen
6E128-26, 6E138-25, 6E129-26 and 6E139-25 User’s Guide 5-23
NOTE
If the 6E12X-26 and 6E13X-25 have been set to 802.1Q
SWITCHING, refer to your
Port Based VLAN User’s Guide to
configure the devices for this type of operation.
The Operational Mode field in the Chassis Configuration
screen does not support the SECURE FAST VLAN operational
mode. For the modules to function as SecureFast switches,
they must have unique IP addresses, and be configured to act
as Standalone devices in terms of Local Management via the
6C105 chassis.
Section 5.15.9 provides additional instructions
and rules that must be followed before configuring the modules
as SecureFast switches.