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VLANs
 
 
 
  
 
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VLAN configuration rules 
VLANs operate according to specific configuration rules which must be considered when creating VLANs. 
For example:  
 
HP recommends that all ports involved in trunking and Port Mirroring have the same VLAN 
configuration. If a port is on a trunk with a mirroring port, the VLAN configuration cannot be 
changed. For more information on port trunking, see the “Port trunking example” section in the “Ports 
and trunking” chapter. 
 
All ports involved in Port Mirroring must have memberships in the same STP group, but they can 
have memberships in different VLANs.  
 
When you delete a VLAN, untagged ports are moved to the default VLAN (VLAN 1). Tagged ports 
that belong only to the deleted VLAN are moved to the default VLAN 1. Tagged ports that belong to 
multiple VLANs are removed from the deleted VLAN only.