Nortel BayStack 380, Using Manual, Page: 70 / 218

70 Chapter 2 Network configuration
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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 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.
• If a port is a trunk group member, all trunk members are added or deleted
from the VLAN.
• 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
configuration cannot be changed.
• Auto PVID can be activated by creating a VLAN and enabling Auto PVID for
it.
Independent VLANs (IVL)
You can configure a VLAN as an Independent VLAN (IVL). Each independent
VLAN maintains its own MAC Address table.
Independent VLANs can have duplicate MAC Addresses on different VLANs. In
Table 7 , both VLANs use the duplicate MAC Address “A”.
For more information about configuring VLANs, see “VLAN Configuration
Menu screen” on page 120 .
See also Appendix C, “Quick configuration for MultiLink Trunking,” on page 199
for configuration flowcharts that can help you use this feature.
Table 7 Independent VLAN (IVL) Forwarding Database Table Example
Port MAC Address VLAN
1 00081XXXA 1
2 00081XXXA 2