Stg Configuration Guidelines - Nortel 2000 Using Manual

STG configuration guidelines

This section provides important information on configuring STGs:
• An STG must be created in the following order:
— Create the STG
— Add the existing VLAN and port memberships
— Enable the STG
• When you create a VLAN, that VLAN automatically belongs to STG 1, the
default STG. If you want the VLAN in another STG, you must move the
VLAN by assigning it to another STG.
• You move a newly created VLAN to an existing STG by following this order:
— Create the VLAN
— Delete the VLAN from STG1
— Add the VLAN to an existing STG
• You cannot delete or move VLAN1 from STG1.
• VLANs must be contained within a single STG; a VLAN cannot span
multiple STGs. By confining VLANs within a single STG, you avoid
problems with spanning tree blocking ports and causing a loss of connectivity
within the VLAN. When a VLAN spans multiple switches, the VLAN must
be within the same spanning tree group (have the same STG ID) across all the
switches.
• All VLANs in the same shared database (SVL) must be assigned to the same
STG.
• All members of a particular MultiLink Trunking (MLT) group must be
assigned to the same STG; that is, they can belong to one and only one STG.
• A port that is not a member of any VLAN cannot be added to any STG. The
port must be added to a VLAN, and that VLAN added to the desired STG.
• Tagged ports can belong to more than one STG, but untagged ports can
belong to only one STG.
• When a tagged port belongs to more than one STG, the egress BPDUs are
tagged to distinguish the BPDUs of one STG from those of another STG.
Using the Business Policy Switch 2000 Version 1.2
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