time to live cap
your node uses this value to limit the time to live counters of all prebroadcasts it receives before forwarding them. For example, if your node has its cap set at 10 and receives a prebroadcast with a time to live of 15, it will lower the time to live to 10 before forwarding the message.
this feature is intended to help you limit the effects network abuse. By sending messages with unreasonably large time to live values, abusers can increase network load.
setting the cap value to 0 will disable the capping feature.