Hi.

We have two z9100-on switches. Dell EMC Networking OS Version : 9.14(2.20)

They are connected together via VLTi.

VLTi status are okay. All statuses are UP, no errors returned.

Config:

vlt domain 1
peer-link port-channel 500
back-up destination X.X.X.X vrf management
primary-priority 20
system-mac mac-address XX.XX.XX.XX.XX
unit-id 1

VLT Domain Brief
------------------
Domain ID: 1
Role: Primary
Role Priority: 20
ICL Link Status: Up
HeartBeat Status: Up
VLT Peer Status: Up
Local Unit Id: 1
Version: 6(9)
Local System MAC address: XX.XX.XX.XX.XX
Remote System MAC address: XX.XX.XX.XX.XX
Configured System MAC address: XX.XX.XX.XX.XX
Remote system version: 6(9)
Delay-Restore timer: 90 seconds
Delay-Restore Abort Threshold: 60 seconds
Peer-Routing : Disabled
Peer-Routing-Timeout timer: 0 seconds
Multicast peer-routing timeout: 150 seconds

Additionally we have configured BGP sessions on both switches. It is working as expected.

The issue we are facing is that once we disconnect uplink to the one of switches we lose connectivity to the whole traffic which being passed via switches. The switches itself are reachable, however anything else which is beyond the switches are unreachable.

Error log does not show any errors whatsoever.