Dell Force10 S4820T FTOS Command Reference Guide - Page 1529

system-mac Configure the MAC address for the VLT domain on a VLT peer switch. Syntax Parameters Defaults Command Modes Usage Information Command History system-mac mac-address mac-address Enter a MAC address in the format aaaa.bbbb.cccc. Automatically assigned based on the primary priority and MAC address of each VLT peer. VLT DOMAIN When you create a VLT domain on a switch, the FTOS software automatically creates a VLT-system MAC address used for internal system operations. Use the system-mac command to explicitly define the MAC address for the domain. You must also reconfigure the same MAC address on the VLT peer switch. Use this command to minimize the time required for the VLT system to synchronize the default MAC address of the VLT domain on both peer switches when one peer switch reboots. Version 8.3.19.0 Version 8.3.8.0 Introduced on S4820T Introduced on S4810 unit-id Explicitly configure the default unit ID of a VLT peer switch. Syntax Parameters Defaults Command Modes Usage Information unit-id [0 | 1] 0 | 1 Configure the default unit ID of a VLT peer switch. Enter 0 for a unit with a lower MAC address or enter 1 for a unit with a higher MAC address. Automatically assigned based on the MAC address of each VLT peer. The peer with the lower MAC address is assigned unit 0; the peer with the higher MAC address is assigned unit 1. VLT DOMAIN When you create a VLT domain on a switch, the FTOS software automatically assigns a unique unit ID (0 or 1) to each peer switch. The unit IDs are used for internal system operations. Use the unit-id command to explicitly configure the unit ID of a VLT peer. You must configure a different unit ID (0 or 1) on each peer switch. Virtual Link Trunking (VLT) | 1529