VLAN Topologies and Design Considerations
VLAN Configuration Rules
© Copyright Lenovo 2017
By default, the Enterprise NOS software is configured so that tagging is disabled
on all external ports and on all internal ports.
By default, the Enterprise NOS software is configured so that all internal ports
are members of VLAN 1.
By default, the Enterprise NOS software is configured so that the management
port is a member of the default management VLAN 4095.
Multiple management VLANs can be configured on the switch, in addition to the
default VLAN 4095, using the following commands:
CN 4093(config)# vlan <VLAN ID (1‐4094)>
CN 4093(config-vlan)# management
When using Spanning Tree, STG 2‐128 may contain only one VLAN unless
Multiple Spanning‐Tree Protocol (MSTP) mode is used. With MSTP mode,
STG 1 to 32 can include multiple VLANs.
VLANs operate according to specific configuration rules. When creating VLANs,
consider the following rules that determine how the configured VLAN reacts in
any network topology:
All ports involved in aggregation and port mirroring must have the same VLAN
configuration. If a port is on a LAG with a mirroring port, the VLAN configura‐
tion cannot be changed. For more information about aggregation, see
"Configuring a Static LAG" on page
If a port is configured for port mirroring, the port's VLAN membership cannot be
changed. For more information on configuring port mirroring, see
"Port Mirroring" on page
Management VLANs must contain the management port, and can include one or
more internal ports (INTx). External ports (EXTx) cannot be members of any
management VLAN.
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Chapter 8: VLANs