User Manual

Configure Switching Information
295
M6100, M5300, and M7100 Series Managed Switches
11. Select Auto or Manual in the VPC MAC Mode field to indicate the administrative mode of
VPC on the system.
The default is Auto.
12. Use the VPC MAC field to configure the MAC address of the VPC domain.
The VPC MAC must be the same on both the MLAG peer devices. The MAC address
must be a unicast MAC address in the format XX:XX:XX:XX:XX:XX and must not be
equal to the physical MAC address of either the primary or secondary VPC system
device. A VPC MAC is auto-generated using the VPC domain ID or it can be configured
manually. The configured VPC domain MAC address is exchanged during role election
and, if configured differently on the peer device, then VPC does not become operational.
The configured domain MAC address is present in the LACP PDUs and STP BPDUs that
are sent on VPC member ports if VPC primary device election takes place after the VPC
MAC address is configured. When the VPC MAC address is configured after the VPC
primary device is elected, the already agreed upon operational VPC MAC address is
used in the LACP PDUs and STP BPDUs, instead of the configured VPC MAC address.
By default, the domain uses a preconfigured MAC address. The VPC MAC address
range is C0:FF:D4:A7:DA:00 to C0:FF:D4:A7:DA:FF.
13. Configure the VPC System Priority for the VPC domain.
The system priority must be the same on both peer devices for VPC to become
operational. If the configured VPC system priority is different on VPC peers, then VPC
does not come up. The system priority is present in the LACP PDUs that are sent out on
VPC member ports if the VPC primary device election takes place after the VPC system
priority is configured. When VPC system priority is configured after the VPC primary
device is elected, the already agreed upon operational VPC system priority is used in the
LACP PDUs, instead of the configured VPC system priority. By default, the VPC system
priority is 32767. The possible range is 1–65535.