Nortel 2000, Using Manual

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Using the Business Policy Switch 2000 Version 1.2
The STG, or bridge group, forms a loop-free topology that includes one or more
virtual LANs (VLANs). With software version 1.2, the BPS 2000 supports
multiple instances (8) of STGs running simultaneously.
As noted in “Increased VLANs ,” the BPS 2000 with software version 1.2 supports
a maximum of 256 VLANs. With a maximum of 8 STGs, on average, each STG
will have 32 VLANs.
In the default configuration of the BPS 2000, a single STG with the ID of 1
includes all ports on the switch. It is called the default STG. Although ports can be
added to or deleted from the default STG, the default STG (STG1) itself cannot
be deleted from the system. Also you cannot delete the default VLAN (VLAN1)
from STG1.
The tagging for the BPDUs from STG1, or the default STG, is user-configurable
(as are tagging settings for all STGs). However, by default STG1 sends out only
untagged BPDUs in order to operate with all devices that support only one
instance of STP. (The default tagging of STG2 through STG8 is tagged.)
All other STGs, except the Default STG, must be created by the user. To become
active, each STG must be enabled by the user after creation. Each STG will be
assigned an ID number from 2 to 8 (the Default STG is assigned the ID number
1). You assign ports or VLANs to an active STG. However, a port that is not a
member of a VLAN will not be allowed to join an STG.
When you not longer need a particular STG, disable and delete that particular one.
The procedure is to disable the STG, delete all VLAN and port memberships, and
then delete the STG.
Note:
When you change the Stack Operational Mode from Pure BPS
2000 Stack mode to Hybrid Stack mode, you lose all STGs above 1 (the
default STG).