Nortel 450-24t 用户指南

Using the BayStack 450 10/100/1000 Series Switch

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Because S4 does not support 802.1Q tagging, a single switch port on each switch 
must be used for each VLAN (see “VLANs Spanning Multiple Untagged 
Switches” on page 1-59).

The connection to S2 requires only one link between the switches because S1 and 
S2 are both BayStack 450 switches that support 802.1Q tagging (see “VLANs 
Spanning Multiple 802.1Q Tagged Switches” on page 1-58).

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:

•

Your switch supports up to 64 VLANs. You can create port-based VLANs and 
protocol-based VLANs, in any combination, as long as you do not exceed a 
total of 64 VLANs.

•

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 3-44.

See also Appendix E, “Quick Steps to Features,” for configuration flowcharts that 
can help you use this feature.