1. it does not speak anymùr about use-failover-group. ?????
2. As long as the default failover group exists holding all the ports, the failover goes wrong if it takes this a wrong port. I cannot remove ports from this failover group..... and i cannot delete the Default failover group.
3. Does this mean that user-defined failover-groups have alwqys prefenrence over the default failover group ?
IF you are on Ontap 8.3 or 9 there is little to no reason to manage your network-failover group manually. You should be managing the broadcast-domain by grouping the ports in to broadcast-domain (same vlan, type & speed) rest will be managed by ontap, if you use the appropriate settings "failover-policy and failover-group" for the LIF while creating it.
You can use the following command to get the LIF's settings.
::> net int show -fields auto-revert,firewall-policy,failover-group,status-admin,dns-zone,role,data-protocol,home-node,home-port,auto,listen-for-dns-query,ipspace,failover-policy,netmask-length,address
The following list describes how the -failover-policy setting affects the target ports that are selected from the failover group:
broadcast-domain-wide : All ports on all nodes in the failover group. system-defined : Only those ports on the LIF's home node and a non-SFO partner. local-only : Only those ports on the LIF's home node. sfo-partner-only : Only those ports on the LIF's home node and its SFO partner. disabled : The LIF is not configured for failover.