Administrator Guide

1. Configure the VLT interconnect for the VLT domain. The primary and secondary switch roles in the VLT domain are automatically
assigned after you configure both sides of the VLTi.
NOTE: If you use a third-party ToR unit, to avoid potential problems if you reboot the VLT peers, Dell EMC
recommends using static LAGs on the VLTi between VLT peers.
2. Enable VLT and create a VLT domain ID. VLT automatically selects a system MAC address.
3. Configure a backup link for the VLT domain.
4. (Optional) Manually reconfigure the default VLT settings, such as the MAC address and VLT primary/ secondary roles.
5. Connect the peer switches in a VLT domain to an attached access device (switch or server).
Configuring a VLT Interconnect
To configure a VLT interconnect, follow these steps.
1. Configure the port channel for the VLT interconnect on a VLT switch and enter interface configuration mode.
CONFIGURATION mode
interface port-channel id-number
Enter the same port-channel number configured with the peer-link port-channel command as described in Enabling VLT and
Creating a VLT Domain.
NOTE: To be included in the VLTi, the port channel must be in Default mode (no switchport or VLAN assigned).
2. Remove any IP address from the interface if already present.
INTERFACE PORT-CHANNEL mode
no ip address
3. Add one or more port interfaces to the port channel.
INTERFACE PORT-CHANNEL mode
channel-member interface
interface: specify one of the following interface types:
• For a 1-GigabitEthernet interface, enter the keyword GigabitEthernet then the slot/port information.
• For a 10-Gigabit Ethernet interface, enter the keyword TenGigabitEthernet then the slot/port information.
4. Ensure that the port channel is active.
INTERFACE PORT-CHANNEL mode
no shutdown
5. Repeat Steps 1 to 4 on the VLT peer switch to configure the VLT interconnect.
Enabling VLT and Creating a VLT Domain
To enable VLT and create a VLT domain, use the following steps.
1. Enable VLT on a switch, then configure a VLT domain and enter VLT-domain configuration mode.
CONFIGURATION mode
vlt domain domain-id
The domain ID range is from 1 to 1000.
Configure the same domain ID on the peer switch to allow for common peering. VLT uses the domain ID to automatically create a VLT
MAC address for the domain. If you do not configure the system explicitly, the system mac-address of the primary will be the VLT
MAC address for the domain.
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 {ipv4-address | ipv6-address} [interval seconds] {vrf [management vrf-
name | vrf-name]}
NOTE:
If management VRF or any specific VRF is enabled on the system, then use the back-up destination
command with vrf [management vrf-name | vrf-name]
You can optionally specify the time interval used to send hello messages. The range is from 1 to 5 seconds.
Virtual Link Trunking (VLT)
857