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Configure RSTP on VLT Peers to Prevent Forwarding Loops
(VLT Peer 2)
Dell_VLTpeer2(conf)#protocol spanning-tree rstp
Dell_VLTpeer2(conf-rstp)#no disable
Dell_VLTpeer2(conf-rstp)#bridge-priority 0
Configuring VLT
VLT requires that you enable the feature and then configure the same VLT domain, backup link, and VLT
interconnect on both peer switches. To configure VLT, use the following procedure.
Prerequisites: Before you begin, make sure that both VLT peer switches are running the same Dell
Networking OS version and are configured for RSTP as described in
ensure that you configure VRRP groups and L3 routing on each VLT peer as described in VLT and VRRP
interoperability in the
Configuration Notes
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
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
NOTE:
To be included in the VLTi, the port channel must be in Default mode (no switchport or
VLAN assigned).
2
Remove an IP address from the interface.
INTERFACE PORT-CHANNEL mode
no ip address
section.
Domain.
RSTP
Configuration. For VRRP operation,
Virtual Link Trunking (VLT)
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Troubleshooting
