Since rain or other obstacles can cause the 60 GHz link to drop completely, I'm investigating whether to run a 5 GHz link also for redundancy. Failure should be ideally detected within a second and traffic transparently routed to the 5 GHz link until the 60 GHz link is back online. Both sides of the link should be part of the same broadcast domain. I believe LACP would work well, but I came across many old posts about this that seemed to run into issues doing this over wireless. Anyone have any recommendations on how to achieve this with RouterOS?
My 2 cents:
After googling and reading I realised that exists only 2 options for backup - rstp and ospf.
With rstp i see 4 sec timeout when moving to backup and 2 secs when moving back. its not the best, but it at least works. The drawback of this scheme is when rain does not kill completely 60g link and link flapping begins. it makes unusable link at all and the only way is to switch off 60g completely and wait when rain will end.