Compile the output filter rules into per peer filter rules.

Compile the output filter rules into per peer filter rules.

especially on route-servers the output filters are in the hot path so
reducing the number of rules to check has a big impact. I have seen a
25% to 30% speedup in my big IXP testbench.
The output ruleset is applied and copied for each peer during config reload
and when a peer is initially added.
OK tb@