Are you saying both ports on the 3850 need to be trunk ports? Ethernet 1/11 is set to no switchport on the Nexus because it has a subinterface of 1/11.1 that you will see in my original post. That sub-interface has an IP attached on it, but still has 802.1q encapsulation set on it. Does the access port strip the 802.1q vlan tag?
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I'm having an issue where it doesn't appear my switch it properly passing vlan traffic. I have an NNI connection what we are trying to connect through a stack of 3850 switches. Because its an NNI we are connecting it into a trunk port on the switch to vlan it off to separate traffic before extending it into our Nexus 3000 which will act as the layer 3 interface. Here is what I have configured so far: 3850: interface GigabitEthernet1/0/35 description xxxx switchport trunk allowed vlan 1400,1401 switchport mode trunk switchport nonegotiate speed 1000 duplex full ! interface GigabitEthernet1/0/36 description xxxxx switchport access vlan 1400 switchport mode access switchport nonegotiate speed 1000 duplex full Nexus 3000: interface Ethernet1/11 speed 1000 description xx no switchport duplex full interface Ethernet1/11.1 description xx encapsulation dot1q 1400 vrf member xx ip address 10.x.x.x/30 Now here's the problem. If I connect my NNI directly into port 11 on my Nexus, the connection comes up just fine, and I'm able to ping across to the other side of the private connection going over the NNI which is part of the 10.x.x.x/30 you see on the nexus config. However, when I connect the NNI to port 1/0/35 on the 3850, and connect port 1/0/36 to the Nexus, I can no longer ping. All interfaces on the 3850 and the Nexus show up/up, I don't see any collisions or errors on any of the interfaces, and I see traffic counters incrementing. My understanding is that the way I have the ports on the 3850 configured, vlan 1400 should just be acting as a layer 2 switch and should still be passing traffic to the nexus with the 802.1q tag still in place. So basically it should still be acting as if the NNI where still directly connected to the Nexus. I can't for the life of me figure out why this is not working. Any insight would be appreciated. I don't know how much this matters but the 3850 does have "vtp mode transparent" configured.
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