
112 Chapter 2 Network configuration
208700-B
Figure 25 shows VLANs spanning two Business Policy Switches. The 802.1Q
tagging is enabled on S1, port 2 and on S2, port 1 for VLAN 1 and VLAN 2. Both
ports are tagged members of VLAN 1 and VLAN 2.
Figure 25 VLANs spanning multiple 802.1Q tagged switches
Because there is only one link between the two switches, the Spanning Tree
Protocol (STP) treats this configuration as any other switch-to-swi tc h connection.
For this configuration to work properly, both switches must support the 802.1Q
tagging protocol.
VLANS spanning multiple untagged switchesFigure 26 shows VLANs spanning multiple untagged switches. In this
configuration, Switch S2 does not support 802.1Q tagging and you must use a
single switch port on each switch for each VLAN.
For this configuration to work properly, you must set spanning tree participation
to Disabled (the STP is not supported across multiple LANs).
VLAN 1
S1
S2
VLAN 2
Both ports are tagged
members of VLAN 1
and VLAN 2
Business
Policy Switch 2000
Business
Policy Switch 2000
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