Can L3 Portchannel Connect to L2 Portchannel ?

[SubnetWarrior]

Hello experts, 

So i have an L3 switch (3850) and N7K. They are connected by a single link 1 gig. Gi1/0/1 in 3850 and eth3/3 in N7K. That one link is to connect ospf. On 3850 side, Gi1/0/1 is a trunk, and the ospf in 3850 is on its interface vlan. On N7K side, eth3/3 is layer 3 which has ip address and ospf configuration on that interface. 

So my client want to have portchannel, so there will be 2 links bundle in one portchannel. My question is, is it possible to connect L3 port channel (portchannel on N7K side) to L2 port channel (portchannel on 3850 side)?

[balaji.bandi]

In short answer NO, you can have sub interface Layer 3 on both the sides for OSPF peering. - is this works for you ?

what is the challenges you see  here ? on both the sides ?

i can advise if you looking Layer 2 Port-channel both the side - you have VLAN SVI Layer 3 for OSPF neighbourship ?

[Joseph W. Doherty]

Hmm, don't recall if I've ever tried that, but suspect it will work.

Why though, is g1/0/1 defined as a trunk?  I assume the 3850's VLAN, which has OSPF active, is the native VLAN on the trunk, correct?

If you don't use the trunk on e3/3, would suggest you define g1/0/1 as an access port.

As an alternative, define a VLAN just to replace the routed e3/3 port, and then the two sides would be alike.