Concept Guide
Congure RSTP on VLT peers to prevent forwarding loops—VLT peer 1
Dell_VLTpeer1(conf)#protocol spanning-tree rstp
Dell_VLTpeer1(conf-rstp)#no disable
Dell_VLTpeer1(conf-rstp)#bridge-priority 4096
Congure 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
NOTE: When you remove the VLT conguration, RSTP is recommended as a backup solution to avoid spanning—tree loops. In
this case, you can use the following RSTP default values:
• hello–time: 2 seconds
• forward–delay: 15 seconds
• max–age: 20
There is no additional performance gain on VLT, if you congure the RSTP values other than the default values.
Conguring VLT
To congure VLT, use the following procedure.
Prerequisites:
Before you begin, make sure that both VLT peer switches are running the same Dell EMC Networking OS version and are congured for
RSTP as described in the RSTP Conguration section. For VRRP operation, ensure that you congure VRRP groups and L3 routing on
each VLT peer as described in VLT and VRRP interoperability in the Conguration Notes section. To congure VLT and create a VLT domain
in which two switches are physically connected and treated as a single port channel by access devices, congure the following settings on
each VLT peer device.
1 Congure the VLT interconnect for the VLT domain. The primary and secondary switch roles in the VLT domain are automatically
assigned after you congure 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 Congure a backup link for the VLT domain.
4 (Optional) Manually recongure 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).
Conguring a VLT Interconnect
To congure a VLT interconnect, follow these steps.
1 Congure the port channel for the VLT interconnect on a VLT switch and enter interface conguration mode.
CONFIGURATION mode
interface port-channel id-number
Virtual Link Trunking (VLT)
963