Mac-Address (Virtual Switch) - Cisco Catalyst 4500 Series Command Reference Manual

Chapter 2 Cisco IOS Commands for the Catalyst 4500 Series Switches

mac-address (virtual switch)

To specify a Media Access Control (MAC) address to use as the common router MAC address for
interfaces on the active and standby chassis, use the mac-address virtual switch configuration submode
command. To return to the default setting, use the no form of this command.
Syntax Description
mac-address
use-virtual
chassis
Defaults The router MAC address is derived from the Cisco pool of virtual switch specific MAC addresses
intended for the domain 1-255.
Command Modes Virtual switch configuration submode (config-vs-domain)
Command History Release
Cisco IOS XE 3.4.0SG and
15.1(2)SG
Usage Guidelines When a virtual switch boots, the router MAC address is derived from the Cisco pool of virtual switch
specific MAC addresses. The router address is used as the common router MAC address for interfaces
on both the active and the standby chassis. Between switchovers, this MAC address is maintained on the
new active switch. You can enter the mac-address mac-address command to specify a MAC address to
use or the mac-address use-virtual command to use the MAC address range reserved for the VSS.
The MAC address range reserved for the VSS is derived from a reserved pool of addresses with the
domain ID encoded in the leading 6 bits of the last octet and trailing 2 bits of the previous octet of the
mac-address. The last two bits of the first octet is allocated for the protocol mac-address that is derived
by adding the protocol ID (0 to 3) to the router MAC address.
You must reload the virtual switch for the new router MAC address to take effect. If the MAC address
Note
you configured is different from the current MAC address, the following message is displayed:
Console (enable)#
Examples The following example shows how to specify the MAC address to use in hexadecimal format:
Router(config)# switch virtual domain test-mac-address
Router(config-vs-domain)# mac-address 0000.0000.0000
OL-27596 -01
mac-address {mac-address | use-virtual | chassis}
no mac-address {mac-address | use-virtual | chassis}
Specifies the MAC address in hexadecimal format.
Specifies the MAC address range reserved for the virtual switch system (VSS).
Specifies a MAC address derived from the chassis.
Modification
Support for this command was introduced on the Catalyst 4500 series
switch.
Catalyst 4500 Series Switch Cisco IOS Command Reference—Release IOS XE 3.4.0SG and IOS 15.1(2)SG)
mac-address (virtual switch)
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