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Alteon OS Application Guide
84
Chapter 3: VLANs 42C4911, January 2007
VLAN Topologies and Design Considerations
By default, the Alteon OS software is configured so that tagging is disabled on all external
ports and all internal ports.
By default, the Alteon OS software is configured so that all internal ports are members of
VLAN 1.
By default, the Alteon OS software is configured so that the management ports (MGT1
and MGT2) are members of the management VLAN 4095.
By default, the Alteon OS software is configured so that the external management port
(EXT7) is a member of VLAN 4094.
If configuring Spanning Tree Groups (STG), note that Spanning Tree Groups 2-128 may
contain only one VLAN.
VLAN configuration rules
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 configura-
tion. If a port is on a trunk with a mirroring port, the VLAN configuration cannot be
changed. For more information trunk groups, see “Port Trunking Example” on page 97.
All ports that are involved in port mirroring must have memberships in the same VLANs.
If a port is configured for port mirroring, the port’s VLAN membership cannot be
changed. For more information on configuring port mirroring, see “Monitoring Ports” on
page 246.