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MikroTik RouterOS is the stand-alone Linux-based operating system that powers MikroTik RouterBOARD hardware.
Connecting to the Switch
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Open your web browser and enter the IP address of your switch (192.168.88.1 by default) and a login screen will appear. The switch can also run a DHCP client, see if a different IP address has been assigned by the DHCP server.
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MikroTik Neighbor Discovery can be used to discover the IP address of the Mikrotik switch. LLDP is not supported.
System
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System Tab performs the following functions:
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SwOS uses a simple algorithm to ensure TCP/IP communication - it just replies to the same IP and MAC address packet came from. This way there is no need for Default Gateway on the device itself.
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DHCP & PPPoE Snooping
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Password and Backup
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Link
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Link Tab allows you to configure each interface settings and monitor the link status.
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PoE
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Devices with PoE-out support have some configuration options and certain monitoring features, like PoE-out current, voltage, etc. For more details about PoE, see the PoE-Out manual.
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If the Voltage Level is set to "auto" and PoE Out is set to "on", the low voltage will be used by default. If the PD supports only high voltage, make sure you also set Voltage Level to "high" when forcing the PoE output.
SFP
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SFP tab allows you to monitor the status of SFP/SFP+ modules.
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Port Isolation
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The Port Isolation table allows or restricts traffic forwarding between specific ports. By default, all available switch chip ports can communicate with any other port, there is no isolation used. When the checkbox is enabled/ticked you allow to forward traffic from this port towards the ticked port. Below are some port isolation examples.
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(R)STP will only work properly in Private VLAN setups. In setups with multiple isolated switch groups (R)STP might not properly receive BPDUs and therefore fail to detect network loops.
LAG
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IEEE 802.3ad (LACP) compatible link aggregation is supported, as well as static link aggregation to ensure failover and load balancing based on Layer2, Layer3 and Layer4 hashing. Up to 16 link aggregation groups with up to 8 ports per group are supported. Each individual port can be configured as Passive LACP, Active LACP, or a Static LAG port.
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Forwarding
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Forwarding Tab provides advanced forwarding options among switch ports, port locking, port mirroring, bandwidth limit, and broadcast storm control features.
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It is possible to limit ingress traffic per-port basis with traffic policer. The ingress policer controls the received traffic with packet drops. Everything that exceeds the defined limit will get dropped. This can affect the TCP congestion control mechanism on end hosts and achieved bandwidth can be actually less than defined.
RSTP
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Per-port and global RSTP configuration and monitoring are available in the RSTP menu.
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Stats, Errors and Histogram
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These menus provide detailed information about received and transmitted packets.
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Statistics for SFP+ interface are cleared whenever an active SFP+ link is established.
VLAN and VLANs
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VLAN configuration for switch ports.
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VLAN membership configuration for switch ports.
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VLAN Configuration Example
Trunk and Access Ports
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In the System menu enable independent VLAN learning (IVL).
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In the VLAN menu configure Default VLAN ID on planned access ports (untagged), select the correct VLAN Receive setting (Port2 only tagged, Port6-8 only untagged) and enable strict VLAN filtering to ensure only allowed VLANs can pass through the ports.
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Trunk and Hybrid Ports
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In the System menu enable independent VLAN learning (IVL).
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In the VLAN menu configure Default VLAN ID on planned hybrid ports (for untagged VLAN), select the correct VLAN Receive setting (Port2 only tagged, Port6-8 any) and enable strict VLAN filtering to ensure only allowed VLANs can pass through the ports.
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Management access
In this example, switch management access on VLAN 200 will be created. The configuration scheme is the same as "Trunk and Access Ports" and 1., 2., 3. configuration steps are identical. The additional 4th step requires to specify the management VLAN ID in the System menu. After applying the configuration, switch will only respond to tagged VLAN 200 packets on Port2 and untagged packets on Port6. The DHCP client will also work in the specified VLAN ID.
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Changing management VLAN can completely disable access to the switch management if VLAN settings are not correctly configured. Save a configuration backup before changing this setting and use Reset in case management access is lost.
Hosts
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This table represents dynamically learned MAC address to port mapping entries. It can contain two kinds of entries: dynamic and static. Dynamic entries get added automatically, this is also called a learning process: when a switch receives a packet from a certain port, it adds the packet's source MAC address and port it received the packet from to the host table, so when a packet comes in with a certain destination MAC address it knows to which port it should forward the packet. If the destination MAC address is not present in the host table then it forwards the packet to all ports in the group. Dynamic entries take about 5 minutes to time out.
Static entries will take over dynamic if dynamic entry with same mac-address already exists. Also by adding a static entry you get access to more functionality.
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IGMP Snooping
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IGMP Snooping which controls multicast streams and prevents multicast flooding is implemented in SwOS starting from version 2.5. The feature allows a switch to listen in the IGMP conversation between hosts and routers.
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IGMP Snooping for VLANs requires enabled "Independent VLAN Lookup" in the System menu.
SNMP
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SwOS supports SNMP v1 and uses IF-MIB, SNMPv2-MIB, BRIDGE-MIB and MIKROTIK-MIB (only for health, PoE-out and SFP diagnostics).
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System information
System uptime
Port status
Interface statistics
Host table information
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ACL Tab
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An access control list (ACL) rule table is a very powerful tool allowing wire-speed packet filtering, forwarding, and VLAN tagging based on L2,L3, and L4 protocol header field conditions. Each rule contains a conditions part and an action part.
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Conditions part parameters
Action part parameters
Health
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This menu provides different health-related properties.
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For devices with only a CPU temperature sensor (CRS326-24G-2S+, CRS305-1G-4S+, CRS309-1G-8S+, CRS318-1Fi-15Fr-2S) health information is available under System menu.
Configuring SwOS using RouterOS
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Since RouterOS 6.43 it is possible to load, save and reset SwOS configuration, as well as upgrade SwOS and set an IP address for the switch by using RouterOS. For more details see this article - Configuring SwOS using RouterOS
This option is not available for the CSS326-24G-2S+ device.
Dual Boot
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The “Dual Boot” feature allows you to choose which operating system you prefer to use, RouterOS or SwOS. You can boot RouterOS under the System menu with the "Boot RouterOS" button.
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These options are not available for the CSS326-24G-2S+ device.
Reset and Reinstall
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It is possible to reset SwOS configuration using the "Reset Configuration" button in the System menu. In case SwOS web management in not available, the configuration can still be reset using other options.
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