Alcatel-Lucent 6850-48 网络指南
Verifying the VLAN Configuration
Configuring VLANs
page 4-16
OmniSwitch AOS Release 6 Network Configuration Guide
September 2009
The connection between Switch 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 switches, VLANs and ports.
The Spanning Tree algorithm determined that if all connections between switches were active, a network
loop would exist that could cause unnecessary broadcast traffic on the network. The path between Switch
C and D was shut down to avoid such a loop. See
connection are in a blocking state. Spanning Tree is active by default on all switches, VLANs and ports.
The Spanning Tree algorithm determined that if all connections between switches were active, a network
loop would exist that could cause unnecessary broadcast traffic on the network. The path between Switch
C and D was shut down to avoid such a loop. See
for information 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 bridged across physical switch connections within the
VLAN 10 domain, the workstations are basically unaware that the switches even exist. Each workstation
believes that the others are all part of the same VLAN, even though they are physically connected to
different switches.
Because traffic between these workstations is bridged across physical switch connections within the
VLAN 10 domain, the workstations are basically unaware that the switches even exist. Each workstation
believes that the others are all part of the same VLAN, even though they are physically connected to
different switches.
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
many benefits of using VLANs.
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
many 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:
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
ence Guide. An example of the output for the show vlan and show vlan port commands is also given in
Displays a list of all VLANs configured on the switch and the status of
related VLAN properties (e.g., admin and Spanning Tree status and
router port definitions).
related VLAN properties (e.g., admin and Spanning Tree status and
router port definitions).
Displays a list of VLAN port assignments.
Displays VLAN IP router interface information.
Displays the current MAC router operating mode (single or multiple)
and VLAN router port statistics.
and VLAN router port statistics.
138.0.0.5
138.0.0.4
138.0.0.3
138.0.0.2
VLAN 10