Concept Guide

This is the IP address to be configured on the VLT peer with the back-up destination command.
3. Ensure that the interface is active.
MANAGEMENT INTERFACE mode
no shutdown
4. Configure a VLT backup link using the IPv4 or IPv6 address of the VLT peer’s management interface.
MANAGEMENT INTERFACE mode
back-up destination {ip address ipv4-address/ mask | ipv6 address ipv6-address/ mask}
5. Repeat Steps 1 to 4 on the VLT peer switch.
To set an amount of time, in seconds, to delay the system from restoring the VLT port, use the delay-restore command at
any time. For more information, refer to VLT Port Delayed Restoration.
Configuring a VLT Port Delay Period
To configure a VLT port delay period, use the following commands.
1. Enter VLT-domain configuration mode for a specified VLT domain.
CONFIGURATION mode
vlt domain domain-id
The range of domain IDs from 1 to 1000.
2. Enter an amount of time, in seconds, to delay the restoration of the VLT ports after the system is rebooted.
CONFIGURATION mode
delay-restore delay-restore-time
The range is from 1 to 1200.
The default is 90 seconds.
Reconfiguring the Default VLT Settings (Optional)
To reconfigure the default VLT settings, use the following commands.
1. Enter VLT-domain configuration mode for a specified VLT domain.
CONFIGURATION mode
vlt domain domain-id
The range of domain IDs is from 1 to 1000.
2. After you configure a VLT domain on each peer switch and connect (cable) the two VLT peers on each side of the VLT
interconnect, the system elects a primary and secondary VLT peer device. To configure the primary and secondary roles
before the election process, use the primary-priority command. Enter a lower value on the primary peer and a higher value on
the secondary peer.
If the primary peer fails, the secondary peer (with the higher priority) takes the primary role. If the primary peer (with the
lower priority) later comes back online, it is assigned the secondary role (there is no preemption).
3. (Optional) When you create a VLT domain on a switch, Dell EMC Networking OS automatically creates a VLT-system MAC
address used for internal system operations.
VLT DOMAIN CONFIGURATION mode
system-mac mac-address mac-address
To explicitly configure the default MAC address for the domain by entering a new MAC address, use the system-mac
command. The format is aaaa.bbbb.cccc.
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.
4. (Optional) When you create a VLT domain on a switch, Dell EMC Networking OS automatically assigns a unique unit ID (0 or
1) to each peer switch.
VLT DOMAIN CONFIGURATION mode
unit-id {0 | 1}
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Virtual Link Trunking (VLT)