Tue Aug 10, 2021 2:25 pm
Is OPSF enabled on this router?
If so, make sure you have interface "all" as passive in OSPF > Interfaces, otherwise it will look for neighbors on every not-passive interface (pppoe ones), causing CPU spikes.
Another usual suspect is NAT (src-nat), make sure is not catching the pppoe interfaces, be the most specific as possible in src-nat rules.
Try to isolate what hogs the CPU via Tools > Profile... alternatively check your mangle setup is optimal, making proper use of mark-connection then mark-packet, not using passthrough when not required, etc...
This being said, using mangle on same router acting as pppoe AC (load balancing) is not the most optimal setup... I would setup the load balancer on another, dedicated upstream / PE router, leaving the 1036 as a strict pppoe AC.