CRS-112-8G-4S high cpu, dhcp

RouterOS General
1

Hi!

I have strange problem with this hardware, network traffic is really low, about 15 Mbps max, but CPU is sometimes 100% at 5Mbit/s. There is only simple configuration with
one WAN connection and one lan bridge subnet and simple NAT. Fasttrack is on and not helping at all.

The second question is about dhcp logs:

20:57:13 dhcp,info dhcpd deassigned 192.168.1.96 from 7C:91:22:CD:BB:8D
20:57:13 dhcp,info dhcpd assigned 192.168.1.96 to 7C:91:22:CD:BB:8D
20:57:14 dhcp,info dhcpd deassigned 192.168.1.96 from 7C:91:22:CD:BB:8D
20:57:14 dhcp,info dhcpd assigned 192.168.1.96 to 7C:91:22:CD:BB:8D
20:57:15 dhcp,info dhcpd deassigned 192.168.1.96 from 7C:91:22:CD:BB:8D
20:57:15 dhcp,info dhcpd assigned 192.168.1.96 to 7C:91:22:CD:BB:8D
20:57:17 dhcp,info dhcpd deassigned 192.168.1.96 from 7C:91:22:CD:BB:8D
20:57:17 dhcp,info dhcpd assigned 192.168.1.96 to 7C:91:22:CD:BB:8D
20:57:18 dhcp,info dhcpd deassigned 192.168.1.96 from 7C:91:22:CD:BB:8D
20:57:18 dhcp,info dhcpd assigned 192.168.1.96 to 7C:91:22:CD:BB:8D
20:57:19 dhcp,info dhcpd deassigned 192.168.1.96 from 7C:91:22:CD:BB:8D
20:57:19 dhcp,info dhcpd assigned 192.168.1.96 to 7C:91:22:CD:BB:8D
20:57:21 dhcp,info dhcpd deassigned 192.168.1.96 from 7C:91:22:CD:BB:8D
20:57:21 dhcp,info dhcpd assigned 192.168.1.96 to 7C:91:22:CD:BB:8D
20:57:22 dhcp,info dhcpd deassigned 192.168.1.96 from 7C:91:22:CD:BB:8D
20:57:22 dhcp,info dhcpd assigned 192.168.1.96 to 7C:91:22:CD:BB:8D
20:57:23 dhcp,info dhcpd deassigned 192.168.1.96 from 7C:91:22:CD:BB:8D
20:57:23 dhcp,info dhcpd assigned 192.168.1.96 to 7C:91:22:CD:BB:8D
20:57:25 dhcp,info dhcpd deassigned 192.168.1.96 from 7C:91:22:CD:BB:8D
20:57:25 dhcp,info dhcpd assigned 192.168.1.96 to 7C:91:22:CD:BB:8D
20:57:26 dhcp,info dhcpd deassigned 192.168.1.96 from 7C:91:22:CD:BB:8D
20:57:26 dhcp,info dhcpd assigned 192.168.1.96 to 7C:91:22:CD:BB:8D

Why there are so many dhcpd assignments to one device ? No matter is it on WiFi or ethernet, every device make logs the same way.

Do you have any solution, or maybe CRS-112 is more switch than router and can’t handle so low traffic ??

2

CRS is a switch not a router! In this case about those dhcp assignment you should check physical connection of this device

3

No, CRS is some kind of router, CSS is a real switch :wink: I think it should go better. I’ll check cables for this dhcp issues. Thanx.

4

CRS products are intended to be L2 switches with limited L3 performance, they are not wire-speed L3 routers.

The performance figures are published on the website for each product, see https://mikrotik.com/product/CRS112-8G-4S-IN#fndtn-testresults for your device.