HP 445946-001 - Manual (Page 59)

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.