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Software Configuration Guide—Release IOS XE 3.6.0E and IOS 15.2(2)SG
OL-30933-01
Chapter 5 Configuring Virtual Switching Systems
Configuring a VSS
Note Preferably, conversion to VSS should be done on a maintenance window. If you plan to use the same port
channel number for VSL, default the existing port channel configurations that are available on
standalone switches. Then, follow the guidelines in section Configuring VSL Port Channel and Ports,
page 5-35.
To convert two standalone switches into a VSS, you perform the following major activities:
• Save the standalone configuration files.
• Configure each switch for required VSS configurations.
• Convert to a VSS.
In virtual switch mode, both switches use the same configuration file. When you make configuration
changes on the VSS Active switch, these changes are automatically propagated to the VSS Standby
switch.
The tasks required to convert the standalone switch to a VSS are detailed in the following sections:
• Backing Up the Standalone Configuration, page 5-34
• Configuring SSO and NSF, page 5-34
• Assigning Virtual Switch Domain and Switch Numbers, page 5-34
• Configuring VSL Port Channel and Ports, page 5-35
• Converting the Switch to Virtual Switch Mode, page 5-36
• (Optional) Configuring VSS Standby Switch Modules, page 5-37
In the procedures that follow, the example commands assume the configuration shown in Figure 5-8.
Figure 5-8 Example VSS
Two chassis, A and B, are converted into a VSS with virtual switch domain 100. Interface 10-Gigabit
Ethernet 5/1 on Switch 1 is connected to interface 10-Gigabit Ethernet 5/2 on Switch 2 to form the VSL.
Note The port channels 10 and 20 mentioned in the config steps below are merely exemplary. You can
configure any port channel number from 1-64 for VSL port channel.
181325
Virtual switch link
(VSL)
Chassis A
(Switch 1)
Chassis B
(Switch 2)
T 5/1 T 5/2
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