Table of Contents

CRS3xx and CSS326-24G-2S+ series features

Features	Description
Forwarding	Full non-blocking wirespeed switching Large Unicast FDB for Layer 2 unicast forwarding Forwarding Database works based on SVL or IVL Port Isolation Jumbo frame support - 10218 bytes
Spanning Tree Protocol	RSTP support
Link Aggregation	Supports 802.3ad LACP groups Supports static link aggregation groups Up to 16 link aggregation groups Up to 8 member ports per a group Hardware automatic failover and load balancing
Multicast Forwarding	IGMP Snooping support Unknown Multicast Filtering
Mirroring	Port-based mirroring
VLAN	Fully compatible with IEEE802.1Q Port-based VLAN Up to 250 VLAN entries (limited by SwOS) VLAN filtering
Security	Port Lock Broadcast Storm Control DHCP & PPPoE Snooping
Quality of Service (QoS)	Ingress traffic limiting
Access Control List	Ingress ACL tables Up to 32 ACL rules (limited by SwOS) Classification based on ports, L2, L3, L4 protocol header fields ACL actions include filtering, forwarding, and modifying the protocol header fields

Models

This table clarifies the main differences between switch models.

Model	Switch Chip	Serial console	Dual Boot	PoE-in support	PoE-out support	Health monitor
CSS326-24G-2S+	Marvell-98DX3216	-	SwOS	ether1, Passive PoE	-	CPU temperature
CRS326-24G-2S+	Marvell-98DX3236	+	RouterOS/SwOS	ether1, Passive PoE	-	CPU temperature
CRS328-24P-4S+	Marvell-98DX3236	+	RouterOS/SwOS	-	ether1 - ether24, 802.3af/at	CPU and board temperature, fan speed, PSU voltage and current, PoE-out monitoring
CRS328-4C-20S-4S+	Marvell-98DX3236	+	RouterOS/SwOS	-	-	CPU temperature, fan speed, PSU state
CRS317-1G-16S+	Marvell-98DX8216	+	RouterOS/SwOS	-	-	CPU temperature, fan speed, PSU state
CRS305-1G-4S+	Marvell-98DX3236	-	RouterOS/SwOS	ether1, 802.3af/at	-	CPU temperature
CRS309-1G-8S+	Marvell-98DX8208	+	RouterOS/SwOS	ether1, 802.3af/at	-	CPU temperature
CRS312-4C+8XG	Marvell-98DX8212	+	RouterOS/SwOS	-	-	CPU temperature, fan speed, PSU state
CRS326-24S+2Q+	Marvell-98DX8332	+	RouterOS/SwOS	-	-	CPU temperature, fan speed, PSU state
CRS318-16P-2S+	Marvell-98DX226S	-	RouterOS/SwOS	-	ether1 - ether16, 802.3af/at	CPU temperature, PSU voltage and current, PoE-out monitoring.
CRS318-1Fi-15Fr-2S	Marvell-98DX224S	-	RouterOS/SwOS	ether1-ether14, ether16, Passive PoE	ether15, Passive PoE	CPU temperature
CRS354-48G-4S+2Q+	Marvell-98DX3257	+	RouterOS/SwOS	-	-	CPU and board temperature, fan speed, PSU voltage and current
CRS354-48P-4S+2Q+	Marvell-98DX3257	+	RouterOS/SwOS	-	ether1 - ether48, 802.3af/at	CPU and board temperature, fan speed, PSU voltage and current, PoE-out monitoring

Connecting to the Switch

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.

SwOS default IP address: 192.168.88.1, user name: admin and there is no password.

Info
MikroTik Neighbor Discovery can be used to discover the IP address of the Mikrotik switch. LLDP is not supported.

Interface Overview

SwOS interface menu consists of multiple tabs depending on the device model. These are all possible SwOS menus: Link, PoE, SFP, Port Isolation, LAG, Forwarding, RSTP, Stats, Errors, Hist, VLAN, VLANs, Hosts, IGMP, SNMP, ACL, System, Health and Upgrade.

Description of buttons in SwOS configuration tool:

Append - add a new item to the end of the list
Apply All - applies current configuration changes
Boot RouterOS - boot device into RouterOS
Cut - removes an item from the list
Clear - reset properties of the item
Discard Changes - removes unsaved configuration
Insert - add a new item to the list (places it before current item)
Sort - sort VLAN table by VLAN-IDs; sort host table by MAC addresses
Change Password - changes the password of the switch
Logout - logout from the current switch
Reboot - reboot the switch
Reset Configuration - reset configuration back to factory defaults
Choose File - browse for upgrade or backup file
Upgrade - upgrade the firmware of the switch using the selected file
Download & Upgrade - automatically try to download and upgrade the firmware, the PC which is running a web browser should be able to access the Internet
Restore Backup - restore switch using a selected backup file
Save Backup - generate and download the backup file from the switch

Info

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 v2.0 and newer
CRS317-1G-16S+ supports SwOS v2.3 and newer
CRS328-24P-4S+ and CRS328-4C-20S-4S+ support SwOS v2.7 and newer
CRS305-1G-4S+ and CRS309-1G-8S+ support SwOS v2.8 and newer
CRS312-4C+8XG and CRS326-24S+2Q+ support SwOS v2.10 and newer
CRS318-16P-2S+ and CRS318-1Fi-15Fr-2S support SwOS v2.11 and newer
CRS354-48G-4S+2Q+ and CRS354-48P-4S+2Q+ support SwOS v2.13 and newer.

System

System Tab performs the following functions:

General information about switch
Switch management
Configuration reset
Backup and restore configuration

Info
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.

Property	Description
Address Acquisition	Specify which address acquisition method to use: `DHCP with fallback` - switch is trying to request an IP address from a DHCP server. If the requests are unsuccessful, then the switch can be accessed using a Static IP Address value `static` - address is set as a Static IP Address value `DHCP only` - switch uses DHCP client to acquire address
Static IP Address	IP address of the switch in case of Address Acquisition is set as `DHCP with fallback` or `static`
Identity	Name of the switch (for Mikrotik Neighbor Discovery protocol)
Allow From	IP address from which the switch is accessible. Default value is '0.0.0.0/0' - any address
Allow From Ports	List of switch ports from which it is accessible
Allow From VLAN	VLAN ID from which the service is accessible. Make sure to first configure VLANs and VLAN pages
Watchdog	Enable or disable system Watchdog. It will reset CPU of the switch in case of fault condition
Independent VLAN Lookup	Enable or disable independent VLAN lookup in the Host table for packet forwarding
IGMP Snooping	Enable or disable IGMP Snooping
IGMP Fast Leave	Enables or disables IGMP fast leave feature on the switch port. This property only has an effect when IGMP Snooping is enabled.
Mikrotik Discovery Protocol	Enable or disable Mikrotik Neighbor Discovery protocol
MAC Address	MAC address of the switch (read-only)
Serial Number	Serial number of the switch (read-only)
Board Name	MikroTik model name of the switch (read-only)
Uptime	Current switch uptime (read-only)
Temperature	Shows CPU temperature in celsius temperature scale (read-only, CSS326-24G-2S+, CRS326-24G-2S+, CRS305-1G-4S+, CRS309-1G-8S+, CRS318-1Fi-15Fr-2S models only)

DHCP & PPPoE Snooping

Property

Description

Trusted Ports

Group of ports, which allows DHCP or PPPoE servers to provide a requested information. When enabled, it allows forwarding DHCP client packets towards the DHCP server through this port. Mainly used to limit unauthorized servers to provide malicious information for users, access ports usually do not configure as trusted. Ports that receive DHCP client packets with already added Option-82 must also be trusted, otherwise these packets are dropped.

Add Information Option

Enables or disables DHCP Option-82 information. When enabled, the Option-82 information (Agent Remote ID and Circuit ID) is added for DHCP packets received from untrusted ports. Can be used together with Option-82 capable DHCP server to assign IP addresses and implement policies.

For Agent Remote ID, SwOS uses interface name where DHCP client resides. For Agent Circuit ID, SwOS uses identity of the SwOS device, internally used port ID and VLAN ID. For example:

Agent Remote ID - Port1

Agent Circuit ID - MikroTik eth 0/1:100

Password and Backup

Link

Link Tab allows you to configure each interface settings and monitor the link status.

Property	Description
Enabled	Enable or disable port
Name	Editable port name
Link Status	Current link status (read-only)
Auto Negotiation	Enable or disable auto-negotiation
Speed	Specify speed setting of the port (requires auto-negotiation to be disabled)
Full Duplex	Specify the duplex mode of the port (requires auto-negotiation to be disabled)
Flow control Tx/Rx	Enable or disable 802.3x Flow control

Info
The switch supports Jumbo frames up to 10218 bytes. Manually decreasing the MTU settings is not supported for SwOS devices.

PoE

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.

Property	Description
PoE Out	Specifies PoE-Out state: auto - the board will attempt to detect if power can be applied to the port. For powering there should be resistance in the range from 3kΩ to 26.5kΩ on - detection range is removed. As a result power over Ethernet will be always on off - all detection and power is turned off for this port
PoE Priority	The PoE Priority specifies the importance of PoE-Out ports, in cases when a total PoE-Out limit is reached, interface with the lowest port priority will be powered off first. Highest priority is 1, lowest priority is 8. If there are 2 or more ports with the same priority then port with the smallest port number will have a higher priority. For example, if ether2 and ether3 have the same priority and over-current is detected then PoE-Out on ether3 will be turned off. Every 6 seconds ports will be checked for a possibility to provide PoE-Out if it was turned off due to port priority.
Voltage Level	Feature which allows to manually switch between two voltage outputs on PoE-Out ports. Will take effect only on PSE with switchable voltage modes (CRS328-24P-4S+RM, netPower 16P, CRS354-48P-4S+2Q+RM).
PoE Status	Shows current PoE-Out status on port: powered on - power is applied to the port, and PoE-Out is operating normally, waiting for load - PSE attempts to detect if power can be applied to the port. For powering there should be resistance in the range from 3kΩ to 26.5kΩ, short circuit- short-circuit is detected on PoE-Out port, power is switched off, the only detection with low voltage takes place, overload - the PoE-Out current limit is exceeded, power is switched off on PoE-Out port. For port limits see each model specifications, disabled - all detection and power is turned off for this port, voltage too low - PD can not be powered with the voltage provided from PSE, current too low - means that PD draws too low current (<10mA) than normal PoE-Out device should, the reason for this can be: The delivered voltage at PD is too low for normal powering (for example Vmin =>30V, but provided 24V); PD uses a second power source which has a higher voltage than PSE, so all current is taken from the second DC source, not PSE PoE-Out port.
PoE Current	Shows current usage on the port measured in milliamperes
PoE Voltage	Shows voltage on the port measured in volts
PoE Power	Shows PoE out power on the port measured in watts

Info
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

SFP tab allows you to monitor the status of SFP/SFP+ modules.

Port Isolation

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.

In some scenarios, you might need to isolate a group of devices from other groups. In this example devices on Port1-Port5 are not able to communicate with Port6-Port10 devices, and vice versa.

In some scenarios, you might need to forward all traffic to an uplink port while all other ports are isolated from each other. This kind of setup is called a Private VLAN configuration. The switch will forward all Ethernet frames only to the uplink Port1, while uplink can reach all other ports

Individual isolated Port1 (e.g. for management purpose), it cannot send or receive traffic from any other port

Info
It is possible to check/uncheck multiple checkboxes by checking one of them and then dragging horizontally (Click & Drag).

Info
(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

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.

Property	Description
Mode (default: passive)	Specify LACP packet exchange mode or Static LAG mode on ports: `Passive`: Places port in listening state, use LACP only when its contrary port uses active LACP mode `Active`: Prefers to start LACP regardless of contrary port mode `Static`: Sets port in a Static LAG mode, it requires to set the same Group setting for all ports that need to be included in the same static LAG
Group	Specify a Static LAG group.
Trunk (read-only)	Represents group number port belongs to.
Partner (read-only)	Represents partner mac-address, only available when ports are included in LACP.

Forwarding

Forwarding Tab provides advanced forwarding options among switch ports, port locking, port mirroring, bandwidth limit, and broadcast storm control features.

Property	Description
Port Lock	`Port Lock` - Enables or disables MAC address learning on this port. When the option is enabled, it will restrict MAC address learning and static MAC addresses should be configured. Any received frames with unknown source MAC address will be dropped `Lock On First` - Allows to learn source MAC address from the first received frame, this property should be used together with `Port Lock`. Learning of the first MAC address will reset every time an interface status changes
Port Mirroring	`Mirror Ingress` - Whether traffic entering this port must be copied and forwarded to the mirroring target port `Mirror Egress` - Whether traffic leaving this port must be copied and forwarded to the mirroring target port `Mirror To` - Mirroring target port
Broadcast Storm Control	`Storm Rate (%)` - Limit the number of broadcast packets transmitted by an interface. The rate is measured in percents of the link speed. `Include Unknown Unicast` - Include unicast packets without an entry in the host table in `Storm Rate` limitation
Multicast Flood Control	`Flood Unknown Multicast` - Changes the multicast flood option on a switch port, only controls the egress traffic. When enabled, the bridge allows flooding multicast packets to the specified switch port, but when disabled, it restricts multicast traffic from being flooded. The setting affects all multicast traffic, this includes non-IP, IPv4, IPv6 and the link-local multicast ranges (e.g. 224.0.0.0/24 and ff02::1).
Bandwidth Limit	`Ingress Rate` - Limit traffic entering this port (bps)

Info
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

Per-port and global RSTP configuration and monitoring are available in the RSTP menu.

Property	Description
Bridge Priority (hex)	RSTP bridge priority for Root Bridge selection
Port Cost Mode	There are two methods for automatically detecting RSTP port cost depending on link speed. `short`: 40G - 1; 10G - 2; 1G - 4; 100M - 10; 10M - 100 `long`: 40G - 500; 10G - 2000; 1G - 20000; 100M - 200000; 10M - 2000000
Root Bridge	The priority and MAC address of the selected Root Bridge in the network (read-only)
RSTP	Enable or disable STP/RSTP functionality on this port
Mode	Shows STP/RSTP functionality mode on a specific port (read-only): `RSTP` `STP`
Role	Shows specific port role (read-only): `root` - port that is facing towards the root bridge and will be used to forward traffic from/to the root bridge `alternate` - port that is facing towards root bridge, but is not going to forward traffic (a backup for root port) `backup` - port that is facing away from the root bridge, but is not going to forward traffic (a backup for non-root port) `designated` - port that is facing away from the root bridge and is going to forward traffic `disabled` - port that is not strictly part of STP (RSTP functionality is disabled)
Root Path Cost	Shows root path cost for ports that are facing root bridge (read-only)
Type	`edge` - ports that are not supposed to receive any BPDUs, should be connected to the end station (read-only) `point-to-point` - ports that operate in full-duplex links, can be part of STP and operate in a forwarding state (read-only)
State	Shows each port state (read-only): `forwarding` - port participates in traffic forwarding and is learning MAC addresses, is receiving BPDUs `discarding` - port does not participate in traffic forwarding and is not learning MAC addresses, is receiving BPDU `learning` - port does not participate in traffic forwarding but is learning MAC addresses

Stats, Errors and Histogram

These menus provide detailed information about received and transmitted packets.

Info
Statistics for SFP+ interface are cleared whenever an active SFP+ link is established.

VLAN and VLANs

VLAN configuration for switch ports.

Property	Description
VLAN Mode (disabled \| optional \| enabled \| strict; Default: optional)	VLAN filtering mode, these options are relevant to egress ports (except for strict mode). disabled - VLAN table is not used. The switch discards packets with a VLAN tag on egress ports. If the packet has a VLAN tag and the VLAN ID matches `Default VLAN ID` on egress ports, then with `VLAN Receive=any` the switch will remove the VLAN tag and forward the packet. optional - Disabled VLAN filtering. Handle packets with VLAN tag ID that is not present in the VLAN table just like packets without VLAN tag. enabled - Enabled VLAN filtering. Drop packets with VLAN tag ID that is not present in the VLAN table. Default VLAN ID must be specified for access ports since it will be used to tag ingress traffic and untag egress traffic for a certain port. strict - Enabled VLAN filtering with additional ingress filtering, which checks if the ingress port is a member of the received VLAN ID in the VLAN table. Received packets on the ingress port with a VLAN ID that does not match with the VLAN table will be dropped. Default VLAN ID must be specified for access ports since it will be used to tag ingress traffic and untag egress traffic for a certain port.
VLAN Receive (any \| only tagged \| only untagged; Default: optional)	Received traffic filtering based on VLAN tag presence. any - allows tagged and untagged packets on a certain port only tagged - allows only packets with a VLAN tag. The "Default VLAN ID" will not work, because it only applies for untagged traffic only untagged - Allows only packets without a VLAN tag
Default VLAN ID (integer: 1..4095; Default: 1)	The switch will place received untagged packets in the "Default VLAN ID" VLAN. Only has an effect on untagged traffic, and when VLAN Receive is set to "any" or "only untagged". It does not apply for tagged traffic. This parameter is usually used to allocate access ports with specific VLAN. It is also used to untag egress traffic if the packet's VLAN ID matches Default VLAN ID.
Force VLAN ID (integer: yes \| no; Default: no)	Assigns the `Default VLAN ID` value to all ingress traffic (tagged and untagged). Has effect in all VLAN Modes. If the port receives tagged traffic and `Default VLAN ID` is set to 1, then with this parameter the egress traffic will be untagged.

VLAN membership configuration for switch ports.

Property	Description
VLAN ID (integer: 1..4095; Default: 0)	VLAN ID to which assign ports.
Name (text; Default: )	Short description of the VLAN.
Port Isolation (yes \| no; Default: yes)	Use settings from `Port Isolation` menu to isolate the defined VLAN to only certain ports. When disabled, the switch will ignore port isolation configuration and forward traffic with the defined VLAN ID only to ports that are checked as members.
Learning (yes \| no; Default: yes)	Enables or disables MAC address learning on the defined VLAN. If disabled, then all learned MAC addresses will appear as they have had been learned from VLAN 1.
Mirror (yes \| no; Default: no)	Enables or disables VLAN-based mirroring. When enabled and `Mirror To` is set in the `Forwarding` menu, then all traffic from the defined VLAN will be mirrored to the selected port.
IGMP Snooping (yes \| no; Default: no)	Enables or disables IGMP Snooping on the defined VLAN. When enabled, the switch will listen to IGMP Join and Leave requests from the defined VLAN and only forward traffic to ports, which have sent IGMP membership requests from the defined VLAN. When disabled, the switch will flood all VLAN member ports with Multicast traffic.
Members (ports; Default: none)	Group of ports, which are allowed to forward traffic on the defined VLAN.

VLAN Configuration Example

Trunk and Access Ports

1. In the System menu enable independent VLAN learning (IVL).

2. In the VLANs menu add VLAN entries and specify port membership.

3. 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.

Trunk and Hybrid Ports

1. In the System menu enable independent VLAN learning (IVL).

2. In the VLANs menu add VLAN entries and specify port membership.

3. 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.

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.

Note
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

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.

Property	Description
Ports	Ports the packet should be forwarded to
MAC	MAC address
VLAN ID	VLAN ID
Drop	A packet with certain MAC address coming from certain ports can be dropped
Mirror	A packet can be cloned and sent to mirror-target port
Port (read-only)	Ports the packet should be forwarded to
MAC(read-only)	Learned MAC address
VLAN ID (read-only)	Learned VLAN ID

IGMP Snooping

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.

Enable this option under the System tab. Since SwOS 2.13 version, IGMP Fast Leave option can also be configured.

Available IGMP snooping data can be found under the IGMP tab.

It is possible to enable IGMP Snooping for a specific VLAN ID under the VLANs menu.

Info
IGMP Snooping for VLANs requires enabled "Independent VLAN Lookup" in the System menu.

SNMP

SwOS supports SNMP v1 and uses IF-MIB, SNMPv2-MIB, BRIDGE-MIB and MIKROTIK-MIB (only for health, PoE-out and SFP diagnostics).

Available SNMP data:

System information
System uptime
Port status
Interface statistics
Host table information

Property	Description
Enabled	Enable or disable SNMP service
Community	SNMP community name
Contact Info	Contact information for the NMS
Location	Location information for the NMS

ACL Tab

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.

Conditions part parameters

Property	Description
From	A port that packet came in from
MAC Src	Source MAC address and mask
MAC Dst	Destination MAC address and mask
Ethertype	Protocol encapsulated in the payload of an Ethernet Frame
VLAN	VLAN header presence: any present not present
VLAN ID	VLAN tag ID
Priority	Priority in VLAN tag
IP Src (IP/netmask:port)	Source IPv4 address, netmask, and L4 port number
IP Dst (IP/netmask:port)	Destination IPv4 address, netmask, and L4 port number
Protocol (integer)	IP protocol
DSCP	IP DSCP field

Action part parameters

Property	Description
Redirect To	Force new packets destination port
Mirror	Clones packet and sends it to mirror-target port
Rate	Limits bandwidth (bps)
Drop	Drop packet
Set VLAN ID	Changes the VLAN tag ID, if VLAN tag is present
Priority	Changes the VLAN tag priority bits, if VLAN tag is present

Health

This menu provides different health-related properties.

Property	Description
CPU Temperature	Shows CPU temperature in celsius temperature scale (read-only)
Board Temperature	Shows PCB temperature in celsius temperature scale (read-only)
FAN	Shows FAN rotational speed (read-only)
PSU	Shows PSU related information depending on device model (read-only): PSU state, either failed or ok (for CRS328-20S-4C-4S+, CRS317-1G-16S+, CRS312-4C+8XG, CRS326-24S+2Q+) PSU voltage and consumed miliamperes by PoE-out connected devices (CRS328-24P-4S+, CRS318-16P-2S+)

Info
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

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

Info
This option is not available for the CSS326-24G-2S+ device.

Dual Boot

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.

Different options are available to change the operating system to SwOS:

Change boot settings in RouterOS using command-line (/system routerboard settings set boot-os=swos) and reboot (/system reboot)
Change boot settings in RouterOS using WinBox or WebFig and reboot
Change boot settings during device booting from a serial console

Info
These options are not available for the CSS326-24G-2S+ device.

Reset and Reinstall

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.

The CSS326-24G-2S+ device has built-in backup SwOS firmware which can be loaded in case standard firmware breaks or upgrade fails:

Holding Reset button for few seconds while CSS326-24G-2S+ is booting resets configuration and loads backup firmware.
After loading backup firmware, it is possible to connect to 192.168.88.1 (or leased address from a DHCP server) using web browser and install new SwOS firmware.

The Dual Boot devices can boot RouterOS using a reset button. Power the device while holding the reset button and wait till user LED starts flashing (around 5 seconds). This will reset the RouterOS configuration and the device will now boot into RouterOS. After device is accessable by RouterOS, it is possible to upgrade and reset SwOS configuration. See the article - Configuring SwOS using RouterOS.

CRS3xx devices with a serial console have additional options.

To change between RouterOS and SwOS follow these steps:

Connect to the device using a serial console
Enter RouterBOOT setup
Choose "j - boot os"
Choose either RouterOS or SwOS

It is possible to load a SwOS backup firmware in case standard firmware breaks or upgrade fails:

Connect to the device using a serial console
Boot SwOS
Choose "p - boot primary SwOS"
After loading backup firmware, it is possible to connect to 192.168.88.1 (or leased address from a DHCP server) using a web browser and install new SwOS firmware.

To reset SwOS configuration:

Connect to the device using a serial console
Boot SwOS
Choose "r - reset configuration"

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