Dell S4820T Configuration Manual page 1004

To disable VLT, use the no vlt domain command.
NOTE: Do not use MAC addresses such as "reserved" or "multicast."
2. Configure the IP address of the management interface on the remote VLT peer to be used as the
endpoint of the VLT backup link for sending out-of-band hello messages.
VLT DOMAIN CONFIGURATION mode
back-up destination ip-address [interval seconds]
You can optionally specify the time interval used to send hello messages. The range is from 1 to 5
seconds.
3. Configure the port channel to be used as the VLT interconnect between VLT peers in the domain.
VLT DOMAIN CONFIGURATION mode
peer-link port-channel id-number
4. (Optional) Prevent a possible loop during the bootup of a VLT peer switch or a device that accesses
the VLT domain.
CONFIGURATION mode
lacp ungroup member-independent {vlt | port-channel port-channel-id}
LACP on VLT ports (on a VLT switch or access device), which are members of the virtual link trunk, is
not brought up until the VLT domain is recognized on the access device.
5. Repeat Steps 1 to 4 on the VLT peer switch to configure the IP address of this switch as the endpoint
of the VLT backup link and to configure the same port channel for the VLT interconnect.
Configuring a VLT Backup Link
To configure a VLT backup link, use the following command.
1. Specify the management interface to be used for the backup link through an out-of-band
management network.
CONFIGURATION mode
interface managementethernet slot/ port
Enter the slot (0-1) and the port (0).
2. Configure an IPv4 address (A.B.C.D) or IPv6 address (X:X:X:X::X) and mask (/x) on the interface.
MANAGEMENT INTERFACE mode
{ip address ipv4-address/ mask | ipv6 address ipv6-address/ mask}
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. Repeat Steps 1 to 3 on the VLT peer switch.
1004
Virtual Link Trunking (VLT)