Auto-Configured Vlans Do Not Exist On A Stacked Aggregator; Stacking Mode Does Not Support Auto-Configured Vlans. Only Vlans That Were Previously Manually Configured Are Retained On The Master Stack Unit; Resolution: You Must Manually Configure Vlan Membership On Each Stack-Unit Port; Steps To Take - Dell PowerEdge M IO Aggregator Command Reference Manual

Auto-configured VLANs do not exist on a stacked Aggregator

Symptom: When an Aggregator is configured and used in a stack, traffic does not flow and the VLAN
auto-configuration on all ports is lost. This behavior happens because an Aggregator in stacking mode does
not support auto-configured VLANs. Only VLANs that were previously manually configured are retained
on the master stack unit.

Resolution: You must manually configure VLAN membership on each stack-unit port.

Steps to Take:

1. Configure VLAN membership on individual ports (
FTOS(conf)# interface tengigabitethernet 0/1
FTOS(conf-if-te-0/1)#vlan tagged 2-5,100,4010
FTOS(conf-if-te-0/1)#
2. Verify the manually configured VLAN membership (
FTOS#show interfaces switchport tengigabitethernet 0/1
Codes: U - Untagged, T - Tagged
x - Dot1x untagged, X - Dot1x tagged
G - GVRP tagged, M - Trunk, H - VSN tagged
i - Internal untagged, I - Internal tagged, v - VLT untagged, V - VLT tagged
Name: TenGigabitEthernet 0/1
802.1QTagged: Hybrid
SMUX port mode: Admin VLANs enabled
Vlan membership:
Q Vlans
U 1
T 2-5,100,4010
Native VlanId: 1
command).
vlan tagged
show interfaces switchport interface
Debugging and Diagnostics | 247
command).