In this post we'll see how to partially fix the high CPU usage while using L2 IOU
L2 IOU 12 causes a lot of CPU usage. Even if iou-web-1.2.0 solve %AMDP2_FE-6-EXCESSCOLL error, L2 IOU causes high CPU usage and can’t work properly. The high CPU usage is
Users: more debugging shows that L2 IOU causes a lot of loopback traffic.
Loopback traffic can be limited obtaining a L2 IOU usable topology:
class-map match-all ARP match protocol arp policy-map ARP-limit class ARP police rate 2 pps burst 20 packets peak-rate 7 pps conform-action transmit exceed-action drop violate-action drop
On Linux the following line on “/etc/sysctl.conf” file, can help:
# Mitigate %AMDP2_FE-6-EXCESSCOLL iou error net.unix.max_dgram_qlen = 2000000
A reboot or manual set is needed.