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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.
• VLANs are not dependent on Rate Limiting settings.
• If a port is an IGMP member on any VLAN, and is removed from a VLAN,
the port’s IGMP membership is also removed.
• If a port is added to a different VLAN, and it is already configured as a static
router port, the port is configured as an IGMP member on that specific
VLAN.
For more information about configuring VLANs, see “VLAN Configuration
Menu” on page 3-22.
See also Appendix D, “Quick Steps to Features,” for configuration flowcharts that
can help you use this feature.
kombk.book Page 47 Tuesday, June 29, 1999 3:25 PM