Dell Configuration Guide for the S4048–ON System 9.14.2.5

Configuring Enhanced VLT (Optional)

To configure enhanced VLT (eVLT) between two VLT domains on your network, use the following procedure.

1. Configure the port channel to be used 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 in the Enabling VLT and Creating a VLT Domain.
2. 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 10-Gigabit Ethernet interface, enter the keyword TenGigabitEthernet then the slot/port/subport[/subport] information.
   • For a 40-Gigabit Ethernet interface, enter the keyword fortyGigE then the slot/port information.
3. 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.
4. Enter the port-channel number that acts as the interconnect trunk.
   VLT DOMAIN CONFIGURATION mode
   peer-link port-channel id-number
5. 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.
6. 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. To explicitly configure the default MAC address for the domain by entering a new MAC address, use the following command.
   VLT DOMAIN CONFIGURATION mode
   system-mac mac-address mac-address
   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.
7. 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. To explicitly configure the default values on each peer switch, use the following command.
   VLT DOMAIN CONFIGURATION mode
   unit-id {0 | 1}
   The unit IDs are used for internal system operations.
   Configure a different unit ID (0 or 1) on each peer switch.
   Use this command to minimize the time required for the VLT system to determine the unit ID assigned to each peer switch when one peer switch reboots.
8. Configure enhanced VLT. Configure the port channel to be used 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 in the Enabling VLT and Creating a VLT Domain.
9. Place the interface in Layer 2 mode.
   INTERFACE PORT-CHANNEL mode
   switchport
10. Associate the port channel to the corresponding port channel in the VLT peer for the VLT connection to an attached device.
    INTERFACE PORT-CHANNEL mode
    vlt-peer-lag port-channel id-number
11. Ensure that the port channel is active.
    INTERFACE PORT-CHANNEL mode
    no shutdown
12. Add links to the eVLT port. Configure a range of interfaces to bulk configure.
    CONFIGURATION mode
    interface range {port-channel id}
13. Enable LACP on the LAN port.
    INTERFACE mode
    port-channel-protocol lacp
14. Configure the LACP port channel mode.
    INTERFACE mode
    port-channel number mode [active]
15. Ensure that the interface is active.
    MANAGEMENT INTERFACE mode
    no shutdown
16. Enable peer routing.
    VLT DOMAIN CONFIGURATION mode
    peer-routing
    If you enable peer routing, a VLT node acts as the proxy gateway for its peer.
17. Repeat steps 1 through 16 for the VLT peer node in Domain 1.
18. Repeat steps 1 through 16 for the first VLT node in Domain 2.
19. Repeat steps 1 through 16 for the VLT peer node in Domain 2.