Dell SmartFabric OS10 User Guide Release 10.5.4

Configure the VLT MAC address

You can manually configure the VLT MAC address.

Configure the same VLT MAC address on both the VLT peer switches to avoid any unpredictable behavior during a VLT failover. For example, when a unit is down or when the VLTi is reset. If you do not configure a VLT MAC address, the MAC address of the primary peer is used as the VLT MAC address across all peers.

Use the vlt-mac mac-address to configure the MAC address in both the VLT peers.

OS10(config)# vlt-domain 1
OS10(conf-vlt-1)# vlt-mac 02:00:00:00:00:02

While configuring a VLT MAC address, if the 8th bit of the MAC address is a 1, then the MAC address is considered to be a multicast MAC address. There are locally defined MAC addresses. For these addresses, the second least significant bit in the first byte must be a 1, which signifies a locally defined address.

The correct MAC addresses must have xxxxxx10 bits set in the first octet, such as x2, x6, xA, xE, and so on.

While manually configuring MAC addresses for VLT, make the 7th bit a 1 - to signify a locally assigned address - and the 8th bit a 0 - to signify a unicast address - which essentially means that you must use one of the following formulas:

• x2:xx:xx:xx:xx:xx
• x6:xx:xx:xx:xx:xx
• xA:xx:xx:xx:xx:xx
• xE:xx:xx:xx:xx:xx