Jaikumar Sharma wrote: > Thank you for pointers, this is a test switch at home but of course > we have bigger Cisco switches at office which have management interface. > It look like LACP needs to be checked/enabled on ports which needs to > be used in network bonding.
Note that LACP is not "active backup" (mode 1) which you have shown in your configuration. LACP is called Dynamic Link Aggregation (mode 4). There are 6 types of bonding explained for example here https://thelinuxcluster.com/2010/01/08/linux-bonding-modes/ All of them configure and behave differently. The peer in case of LACP also has to be configured accordingly. I have not done this in debian, but on Red Hat it needed some manual configuration of the ETHTOOL options for the network devices, so that it works properly.
