Adding And Removing Ports From Stgs - Lenovo RackSwitch G8264 Application Manual

Adding and Removing Ports from STGs

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G8264 Application Guide for ENOS 8.4
The following rules apply when you add ports to or remove ports from STGs:
When you add a port to a VLAN that belongs to an STG, the port is also added

to that STG. However, if the port you are adding is an untagged port and is
already a member of another STG, that port will be removed from its current
STG and added to the new STG. An untagged port cannot belong to more than
one STG.
For example: Assume that VLAN 1 belongs to STG 1, and that port 1 is untagged
and does not belong to any STG. When you add port 1 to VLAN 1, port 1 will
automatically become part of STG 1.
However, if port 5 is untagged and is a member of VLAN 3 in STG 2, then
adding port 5 to VLAN 1 in STG 1 will change the port PVID from 3 to 1:
"Port 5 is an UNTAGGED/Access Mode port and its PVID/Native­VLAN
changed from 3 to 1.
When you remove a port from VLAN that belongs to an STG, that port will also

be removed from the STG. However, if that port belongs to another VLAN in the
same STG, the port remains in the STG.
As an example, assume that port 2 belongs to only VLAN 2, and that VLAN 2
belongs to STG 2. When you remove port 2 from VLAN 2, the port is moved to
default VLAN 1 and is removed from STG 2.
However, if port 2 belongs to both VLAN 1 and VLAN 2, and both VLANs
belong to STG 1, removing port 2 from VLAN 2 does not remove port 2 from
STG 1 because the port is still a member of VLAN 1, which is still a member of
STG 1.
 An STG cannot be deleted, only disabled. If you disable the STG while it still
contains VLAN members, Spanning Tree will be off on all ports belonging to
that VLAN.
The relationship between port, LAGs, VLANs, and Spanning Trees is shown in
Table 17 on page 189.