Configuring a single VLT domain with Dell upstream switches or a single vPC domain with Cisco upstream switches is required. Creating two VLT/vPC domains may cause a network loop. See Scenario 1: SmartFabric deployment with S5232F-ON upstream switches with Ethernet - No Spanning Tree uplink and Scenario 2: SmartFabric connected to Cisco Nexus 3232C switches with Ethernet - No Spanning Tree uplink for the topology that is used in the deployment example.
The following example shows a mismatch of the VLT domain IDs on VLT peer switches. To resolve this issue, ensure that a single VLT domain is used across the VLT peers.
S5232-Leaf1# show vlt 1
Domain ID : 1
Unit ID : 1
Role : primary
Version : 1.0
Local System MAC address : 4c:76:25:e8:f2:c0
S5232-Leaf2# show vlt 30
Domain ID : 30
Unit ID : 1
Role : primary
Version : 1.0
The following example shows a mismatch of the vPC domain IDs on vPC peer switches. To resolve this issue, ensure that a single vPC domain is used across the vPC peers.
Nexus-3232C-Leaf1# show vpc
Legend:
(*) - local vPC is down, forwarding via vPC peer-link
vPC domain id : 1
Peer status : peer link is down
vPC keep-alive status : peer is alive, but domain IDs do not match
---- OUTPUT TRUNCATED -----
3232C-Leaf2# show vpc
Legend:
(*) - local vPC is down, forwarding via vPC peer-link
vPC domain id : 255
Peer status : peer link is down
vPC keep-alive status : peer is alive, but domain IDs do not match
---- OUTPUT TRUNCATED -----