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60 Chapter 2 Network configuration
209418-A
VLANs spanning multiple switches
You can use VLANs to segment a network within a switch. When you connect
multiple switches, it is possible to connect users of one VLAN with users of that
same VLAN in another switch. However, the configuration guidelines depend on
whether both switches support 802.1Q tagging.
With 802.1Q tagging enabled on a port for a VLAN, all frames leaving the port
for that VLAN are marked as belonging to that specific VLAN. You can assign
specific switch ports as members of one or more VLANs that span multiple
switches, without interfering with the Spanning Tree Protocol.
VLANs spanning multiple 802.1Q tagged switches
Figure 17 shows VLANs spanning two BayStack 420 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 17 VLANs spanning multiple 802.1Q tagged switches
VLAN 1
S1
S2
VLAN 2
BayStack
420
Both ports are tagged
members of VLAN 1
and VLAN 2
BayStack
420
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