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Verifying the VLAN Configuration Configuring VLANs
page 4-14 OmniSwitch 6600 Family Network Configuration Guide April 2006
The connection between Stack C and D is shown with a broken line because the ports that provide this
connection are in a blocking state. Spanning Tree is active by default on all stacks, VLANs and ports. The
Spanning Tree algorithm determined that if all connections between stacks were active, a network loop
would exist that could cause unnecessary broadcast traffic on the network. The path between Stack C and
D was shut down to avoid such a loop. See Chapter 5, “Configuring Spanning Tree Parameters,” for infor-
mation about how Spanning Tree configures network topologies that are loop free.
The following diagram shows the same bridging domain example as seen by the end user workstations.
Because traffic between these workstations is transparently bridged across physical stack connections
within the VLAN 10 domain, the workstations are basically unaware that the stacks even exist. Each
workstation believes that the others are all part of the same VLAN, even though they are physically
connected to different stacks.
VLAN Bridging Domain: Logical View
Creating a VLAN bridging domain across multiple switches and/or stacks of switches allows VLAN
members to communicate with each other, even if they are not connected to the same physical switch. This
is how a logical grouping of users can traverse a physical network setup without routing and is one of the
main benefits of using VLANs.
Verifying the VLAN Configuration
To display information about the VLAN configuration for a single switch or a stack of switches, use the
show commands listed below:
For more information about the resulting displays from these commands, see the OmniSwitch CLI Refer-
ence Guide. An example of the output for the show vlan and show vlan port commands is also given in
“Sample VLAN Configuration” on page 4-3.
show vlan Displays a list of all VLANs configured on the switch and the status of
related VLAN properties (e.g., admin, Spanning Tree, and router inter-
face status).
show vlan port Displays a list of VLAN port assignments.
show ip interface Displays the IP router interface configuration.
show vlan router mac status Displays the current MAC router operating mode (single or multiple)
and router VLAN statistics.
138.0.0.5
138.0.0.4
138.0.0.3
138.0.0.2
VLAN 10