Hello VPP experts,

Using the current master branch, we now get log messages like this
(shown by journalctl in red color):

Nov 25 15:10:29 vnet[...]: interface: hw_add_del_mac_address:
vnet_hw_interface_add_del_mac_address: Secondary MAC Addresses not
supported for interface index 0
Nov 25 15:10:29 vnet[...]: interface: hw_add_del_mac_address:
vnet_hw_interface_add_del_mac_address: Secondary MAC Addresses not
supported for interface index 0

This seems to have started with the commit d1bd5d26 "interface: improve
logging" on November 23. Even though the commit message says it was
only a logging change, I still wnder if the message is correct and if
so, if it means that something is wrong with the way we have configured
VPP.

Here is an example of VPP commands leading to those log messages:

create bond mode lacp load-balance l23
create int rdma host-if enp101s0f1 name i1
create int rdma host-if enp179s0f1 name i2
bond add BondEthernet0 i1
bond add BondEthernet0 i2
create sub-interfaces BondEthernet0 1
create sub-interfaces BondEthernet0 2
set int ip address BondEthernet0.1 10.0.0.1/30

The "set int ip address" command there triggers two such "Secondary MAC
Addresses not supported" messages -- what does that mean in case of the
config above?
Should we do something differently to avoid the error messages?

Best regards,
Elias
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