Chapter 2 Ne twork configuration 113
Using the Business Policy Switch 2000 Version 1.2
Refer to Chapter 1 for additional guidelines on co nfiguring VLANs and spanning
tree groups.
Figure 26 VLANs spanning multiple untagged switches
When the STP is enabled on these switches, only one link between each pair of
switches will be forwarding traffic. Because each port bel ongs to only one VLAN
at a time, connectivity on the other VLAN is lost. Exercise care when configuring
the switches to ensure that the VLAN configuration does not conflict with
spanning tree configuration.
To connect multiple VLANs across switches with redundant links, you must
disable the STP on all participating switch ports. Figure27 shows possible
consequences of enabling the STP when using VLANs between untagged
(non-802.1Q tagged) switches.
VLAN 1
S1
S2
VLAN 2
Business
Policy Switch 2000
Untagged ports
Non-802.1Q
tagging switch
9800EA