Vlan Topologies And Design Considerations - Lenovo Flex System Fabric CN4093 Application Manual

VLAN Topologies and Design Considerations

VLAN Configuration Rules
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CN4093 Application Guide for N/OS 8.2
 By default, the Lenovo N/OS software is configured so that tagging is disabled on
all external ports and on all internal ports.
 By default, the Lenovo N/OS software is configured so that all internal ports are
members of VLAN 1.
 By default, the Lenovo N/OS 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:
CN4093(config)# vlan <x>
CN4093(config­vlan)# 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 trunking and port mirroring must have the same VLAN

configuration. If a port is on a trunk with a mirroring port, the VLAN configura‐
tion cannot be changed. For more information trunk groups, see "Configuring a
Static Port Trunk" 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 Mir‐
roring" on page 531.
 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.
137.