LB::reselect doesn't select another node

I also had a problem with LB::reselect selecting always the same node, but in different circumstances. My iRule uses "hand-made" persistence, i.e. it extracts the server address from the packet contents and selects it using the node command. The simplified iRule is below (the actual one is too complex to put here):

 

when HTTP_REQUEST {
  HTTP::collect [HTTP::header "Content-Length"]
}
when HTTP_REQUEST_DATA {
   Assume that payload contains host:port
  set host [substr [HTTP::payload] 0 ":"]
  set port [findstr [HTTP::payload] ":" 1]
  
  Route there only if node status is "up"
  set status [LB::status pool $::pool member $host $port]
  log local0.debug "Status: $status"
  if { $status eq "up" } {
    node $host $port
  }
}
when LB_FAILED {
  If the selected server doesn't work, route it to any server
  LB::reselect
}

 

 

This didn't work correctly - LB::reselect always selected the same node as previously selected by "node" command. Adding LB::detach before reselect didn't change anything. However, it turned out that using LB::reselect with pool name works (even without detach)! So, the code for LB_FAILED event now looks as follows:

 

 

when LB_FAILED {
  If the selected server doesn't work, route it to any server
  LB::reselect pool mypool
}

 

It seems that when I was using LB::reselect without argument, the node command was still in force.