Mikrotik switch cpu flow control. Help. auto is the same as on except when auto-negotiation=yes flow control status is resolved by taking into account what other end advertises. /interface ethernet switch set switch1 cpu-flow-control=no /interface ethernet switch set switch2 cpu-flow-control=no If you only want to disable it on one of the switch ports, only run the relevant command above for the switch chip you want to disable it for. Mikrotik CCR1036 sfp + port and our OLT device manufacturer 10G sfp + uplink port, and our switch CRS317 running in SwitchOS mode. The second spf+ with a MikroTik S+RJ10 in it tested about the same at 1 gig and seemingly full speed at 2. Only in single bridge mode will hardware offloading start working. My uneducated guess is that it won't tell the 10Gbps upstream port to stop sending because the output buffer on 1-2. Mar 10, 2025 · CPU Flow Control All switch chips have a special port that is called switchX-cpu, this is the CPU port for a switch chip, it is meant to forward traffic from a switch chip to the CPU, such a port is required for management traffic and routing features. If I am connected via winbox and ssh and I issue a reboot from cli while still connected with winbox, the router hangs with a dim ether 2 and power needs to be removed/reapplied to boot. maybe. This should have upstream switches stop before/when buffers are full. You shouldn’t need enabling traffic flow for starters. The two typical scenarios I see people resorting to it are: Backpressure. The switches show 20% CPU load on the bridge and 80% load on "networking" I have turned off the following features. May 15, 2025 · Summary. We aren't doing any configuration to the AR8327N so the registers are in default state. In addition, PFC enables co-existence of loss-sensitive traffic types with loss tolerant traffic type in the same network. tx-flow-control (on | off | auto; Default: off) With interface queues, I have fq_codel (800/300M limited on WAN). we noticed the following. 43开始，在一些使用以下交换芯片的设备上可以禁用CPU流量控制功能。Atheros8227、QCA8337、Atheros8327、Atheros7240或Atheros8316。其他交换芯片默认启用该功能，不能改变。要禁用CPU流量控制，请使用以下命令。 /interface ethernet switch set switch1 cpu-flow-control=no Mikrotik user. It prevents packet loss, at the expense of a few ms latency for those paused packets. 从RouterOS v6. l2mtu=1592 name Oct 13, 2020 · To disable the cpu-flow-control option, use the following command(s): /interface ethernet switch set switch1 cpu-flow-control=no /interface ethernet switch set switch2 cpu-flow-control=no If you only want to disable it on one of the switch ports, only run the relevant command above for the switch chip you want to disable it for. So either there is a bug in this indication, and you have to set fast-leave and frame-types on the /interface bridge port rows to the default values as one of them disables the L2 offloading, or there is some other bug After further testing I can reliably reproduce the hang. I thin connected a copper port on the CRS326 to a MikroTik S+RJ10 in the CRS317 and the other copper ports ran at 940 mbps. a “patch” to “solve” (read, alleviate) the true problem. If I do VLAN routing via OPNsense I get around If I do VLAN routing via OPNsense I get around 5 Gbit but after some time the switch CPU gets to 100 % mostly at bridging and networking. Sub-menu: /interface ethernet Standards: IEEE 802. By setting a static IP address, the address acquisition process does not change, which is Hit enter to search. Online Help Keyboard Shortcuts Feed Builder What’s new Dec 20, 2023 · Hello everyone, I am using a CRS312-4C+8XG as my main switch. I have VLANs, inter-VLAN routing is happening at RB5009, everything else is pretty "default". 43 and apply following RouterOS command to prevent lockups between RB3011 switch chips and CPU. You can find an example of switch chip’s statistics below: [admin@MikroTik] > /interface ethernet switch print stats. Mar 30, 2022 · These statistics can also be used to monitor CPU Flow Control. Extract from manual: Jan 27, 2025 · Each RouterBoard switch series device has its own firmware which cannot be installed on other series models! CRS326-24G-2S+ and CSS326-24G-2S+ support SwOS v2. rx-flow-control=auto tx Sep 19, 2021 · The configuration seems correct except ether9 being a member port of a non-existent bridge, and /interface bridge port print shows the hardware offloading to be active. Any benefit to set CPU Flow Control ON or OFFCheck the video if you notice any different!Music: Gravity BassMusician: NordgrooveSite: https://i Mar 24, 2025 · a switch might have learned that some hosts can only be reached through the CPU (switch-cpu port learning is discussed in the next section), e. e. CPU Flow Control All switch chips have a special port that is called switchX-cpu, this is the CPU port for a switch chip, it is meant to forward traffic from a switch chip to the CPU, such a port is required for management traffic and for routing features. All of my clients are 1G only (except Syno NAS with LACP 2x1G on the switch). 43. 43 it is possible to disable the CPU Flow Control feature on some devices that are using one of the follow switch chips: Atheros8227, QCA8337, Atheros8327, Atheros7240 or Atheros8316. If you have experienced this problem, it is recommended to upgrade to the v6. I've got them talking to each other but they are occasionally losing clock sync between them and I've traced it down to both CRS328 units running at 100% CPU. Dec 9, 2015 · In my experience, and IMHO, using traffic flow control is like disabling auto negotiation, i. 168. May 23, 2016 · Since RouterOS v6. I recently stumbled accross a strange behaviour regarding switching traffic: If I run iperf3 within the same VLAN I get near wire speed (~ 9. I uncheck the box and hit apply and it responds with “Couldn’t change Switch Settings - cpu flow control not supported (6)” This is the same setup i have used on other switches and it works perfectly. The RB760iGS has two “lanes” to the switch chip so the output of /interface ethernet switch print stats has two counters for each. I tried this without any positive results. It is connected to two Proxmox servers via LACP. Flow control issues pause requests to the sender if the ethernet port or switch chip is close to becoming overwhelmed. 5 Gbit). 5, 5, and 10. 88. Feature is supported on AR724x, AR9xxx, QCA9xxx CPU ports, all CCR ports and all Atheros switch chip ports. The copper ports tested about at 900 mbps, sadly both with flow control on and off). - network discovery (so there is no accidental traffic on any interfaces). Oct 21, 2022 · If I however switch global l3-hw-offloading OFF interface ethernet switch set 0 !cpu-flow-control l3-hw-offloading=no mirror-source=none mirror-target=none name May 13, 2025 · identity (name; Default: Mikrotik) Name of the switch (used for Mikrotik Neighbor Discovery protocol) static-ip-address (IP; Default: 192. On my Proxmox servers I run an OPNsense appliance for firewalling and intervlan routing. I dunno If I do VLAN routing via OPNsense I get around 5 Gbit but after some time the switch CPU gets to 100 % mostly at bridging and networking. g. MikroTik RouterOS supports various types of Ethernet interfaces - ranging from 10Mbps to 10Gbps Ethernet over copper twisted pair, 1Gbps, 10Gbps, 25Gbps SFP/SFP+/SFP28 interfaces and 40Gbps, 100Gbps QSFP+/QSFP28 interfaces. 3 MikroTik RouterOS supports various types of Ethernet interfaces - ranging from 10Mbps to 10Gbps Ethernet over copper twisted pair, 1Gbps and 10Gbps SFP/SFP+ interfaces and 40Gbps QSFP interface. when a bridge contains HW and non-HW offloaded interfaces, such as wireless, EoIP, and even Ethernet interfaces; a packet is intentionally copied to the switch-cpu, e. 1- Mikrotik CCR1036 SFP + port had disabled flow control tx/rx 2- CRS317 switch had sfp + ports flow control tx/rx also disabled Jan 6, 2024 · I am using a CRS312-4C+8XG as my main switch. 0 and newer Hit enter to search. Summary. Aug 19, 2022 · IMHO, one bridge is not the "best" solution. no flow control anywhere. If it alleviates a problem, go fix the true problem. I am trying to then turn off “Forward Invalid VLAN” so that vlan 1 will no longer work through the bridge. Thanks for any help. . 5 Gbps is full. 1) IP address of the switch in case address-acquisition-mode is either set to dhcp-with-fallback or static. Bridge HW offload on both devices, l3hw is not enabled on the CRS326. Online Help Keyboard Shortcuts Feed Builder What’s new Feb 7, 2020 · after some checking on both devices configuration. Sep 14, 2018 · I have set up a CRS112 with vlans using the switch menu. Is there a bug in the Oct 4, 2018 · Hello, RB3011 Port Flapping problem is addressed by means of a new CPU Flow Control setting in RouterOS v6. This is - the "only" solution. Jun 6, 2025 · Priority-based Flow Control (PFC) Priority-Based Flow Control (PFC) provides lossless operation for up to eight traffic classes, so that congestion in one traffic class does not pause other traffic classes. See the block diagram for which ports are linked to which switch chip. /interface ethernet switch set switch1,switch2 cpu-flow-control=no CRS312 gets to 100 % CPU - MikroTik Search…. for a packet inspection; Mikrotik also suggested turning on flow control everywhere. jkp dtvr nckq vdlxp pmw chdqtn udqlr iktxe lxsrz ewkwzu