Yeah, I agree... any other solution than USB is better for this, but this
is what I have. Startech - they are on the supported hcl list

Running tagged VLANs on top of one of these goes well, but if I create a
trunk against a cisco catalyst switch, I get random USB IOERRORs and
similar.

The trunk comes up, but not data passes

Cisco has this:

interface GigabitEthernet1/0/1
 switchport trunk allowed vlan 51
 switchport mode trunk
 channel-group 1 mode active
!
interface GigabitEthernet1/0/2
 switchport trunk allowed vlan 51
 switchport mode trunk
 channel-group 1 mode active
!
interface GigabitEthernet1/0/3
 switchport access vlan 51
 switchport mode access
!
interface GigabitEthernet1/0/4
 switchport trunk allowed vlan 51
 switchport mode trunk
!


Trunk comes up:

Switch#sh etherchannel detail
                Channel-group listing:
                ----------------------

Group: 1
----------
Group state = L2
Ports: 2   Maxports = 16
Port-channels: 1 Max Port-channels = 16
Protocol:   LACP
Minimum Links: 0
                Ports in the group:
                -------------------
Port: Gi1/0/1
------------

Port state    = Up Mstr Assoc Not-in-Bndl
Channel group = 1           Mode = Active          Gcchange = -
Port-channel  = Po1         GC   =   -             Pseudo port-channel = Po1
Port index    = 0           Load = 0x00            Protocol =   LACP

Flags:  S - Device is sending Slow LACPDUs   F - Device is sending fast
LACPDUs.
        A - Device is in active mode.        P - Device is in passive mode.

Local information:
                            LACP port     Admin     Oper    Port        Port
Port      Flags   State     Priority      Key       Key     Number
 State
Gi1/0/1   SA      bndl      32768         0x1       0x1     0x102       0xD

Partner's information:

                  LACP port                        Admin  Oper   Port
 Port
Port      Flags   Priority  Dev ID          Age    key    Key    Number
 State
Gi1/0/1   SA      32768     0024.9b76.24c7  29s    0x0    0x403C 0x5
0x75

Age of the port in the current state: 0d:00h:00m:27s

Port: Gi1/0/2
------------

Port state    = Up Mstr Assoc Not-in-Bndl
Channel group = 1           Mode = Active          Gcchange = -
Port-channel  = Po1         GC   =   -             Pseudo port-channel = Po1
Port index    = 0           Load = 0x00            Protocol =   LACP

Flags:  S - Device is sending Slow LACPDUs   F - Device is sending fast
LACPDUs.
        A - Device is in active mode.        P - Device is in passive mode.

Local information:
                            LACP port     Admin     Oper    Port        Port
Port      Flags   State     Priority      Key       Key     Number
 State
Gi1/0/2   SA      bndl      32768         0x1       0x1     0x103       0xD

Partner's information:

                  LACP port                        Admin  Oper   Port
 Port
Port      Flags   Priority  Dev ID          Age    key    Key    Number
 State
Gi1/0/2   SA      32768     0024.9b76.24c7  28s    0x0    0x403C 0x6
0x75

Age of the port in the current state: 0d:00h:00m:26s

                Port-channels in the group:
                ---------------------------

Port-channel: Po1    (Primary Aggregator)

------------

Age of the Port-channel   = 0d:02h:01m:52s
Logical slot/port   = 12/1          Number of ports = 2
HotStandBy port = null
Port state          = Port-channel Ag-Inuse
Protocol            =   LACP
Port security       = Disabled

Ports in the Port-channel:

Index   Load   Port     EC state        No of bits
------+------+------+------------------+-----------
  0     00     Gi1/0/1  Active             0
  0     00     Gi1/0/2  Active             0

Time since last port bundled:    0d:00h:00m:26s    Gi1/0/2
Time since last port Un-bundled: 0d:00h:00m:28s    Gi1/0/2

On the OpenBSD, I have:

trunkproto lacp trunkport axen0 trunkport axen1
up

And the trunk0 comes up

Then I do:
parent trunk0
vnetid 51
descr unifimgmt
inet 10.45.51.252/24

Does not work... but if I destroy trunk0, remove one of the USBs, and
instead do like this:

ifconfig axnt0 up

and

parent axen0
vnetid 51
descr unifimgmt
inet 10.45.51.252/24

Then vlan51 passes data as it should.

I do something wrong?

Regards, Lars.

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