Manually Assigning Stgs; Guidelines For Creating Vlans; Rules For Vlan Tagged Ports - Lenovo Flex System Fabric CN4093 Application Manual

Manually Assigning STGs

1. If no VLANs exist (other than default VLAN 1), see "Guidelines for Creating
VLANs" on page
them.
2. Assign the VLAN to an STG using one of the following methods:

Guidelines for Creating VLANs

Rules for VLAN Tagged Ports

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The administrator may manually assign VLANs to specific STGs, whether or not
VASA is enabled.
153 for information about creating VLANs and assigning ports to
From the global configuration mode:

CN4093(config)# spanning­tree stp <STG number> vlan <VLAN>
Or from within the VLAN configuration mode:

CN4093(config)# vlan <VLAN number>
CN4093(config­vlan)# stg <STG number>
CN4093(config­vlan)# exit
When a VLAN is assigned to a new STG, the VLAN is automatically removed from
its prior STG.
Note: For proper operation with switches that use Cisco PVST+, it is
recommended that you create a separate STG for each VLAN.
 When you create a new VLAN, if VASA is enabled (the default), that VLAN is
automatically assigned its own STG. If VASA is disabled, the VLAN
automatically belongs to STG 1, the default STG. To place the VLAN in a
different STG, see "Manually Assigning STGs" on page
automatically removed from its old STG before being placed into the new STG.
 Each 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, it is recommended that the
VLAN remain within the same STG (be assigned the same STG ID) across all the
switches.
 If ports are tagged, all trunked ports can belong to multiple STGs.
 A port cannot be directly added to an STG. The port must first 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.
153. The VLAN is
Chapter 11: Spanning Tree Protocols
153