Difference between revisions of “SwOS/CSS106”


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===PoE (CSS106-1G-4P-1S)===


===PoE (CSS106-1G-4P-1S)===

Latest revision as of 15:52, 7 November 2018


SwOS is an operating system designed specifically for administration of MikroTik Switch products.

SwOS is configurable from your web browser. It gives you all the basic functionality for a managed switch, plus more: allows to manage port-to-port forwarding, broadcast storm control, apply MAC filter, configure VLANs, mirror traffic, apply bandwidth limitation and even adjust some MAC and IP header fields.


Warning: Each RouterBoard switch series have their own firmware which cannot be installed on other series models! New RB260GS (CSS106-5G-1S), new RB260GSP(CSS106-1G-4P-1S) supports SwOS v2.0 and newer.

CSS106 series features

Features Description
  • Full non-blocking wirespeed switching
  • Up to 2k MAC entries in Host table
  • Forwarding Database works based on SVL or IVL
  • Port Isolation
  • Port Lock
  • Jumbo frame support – 9198 bytes
Spanning Tree Protocol
Multicast Forwarding
  • Fully compatible with IEEE802.1Q
  • Port based VLAN
  • VLAN filtering
Quality of Service (QoS)
  • Ingress traffic limiting (by ACL)
  • Egress 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 of the protocol header fields

Connecting to the Switch

Open your web browser and enter IP address of your Switch ( by default) and login screen will appear.

Alt text SwOS Login

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


Note: MikroTik neighbor discovery protocol tools can be used to discover IP address of Mikrotik Switch. Manual:IP/Neighbor_discovery. Currently LLDP is not supported.

Interface Overview

SwOS interface menu consists of several tabs: Link, SFP, Forwarding, RST, Statistics, Errors, VLAN, VLANs, Hosts, IGMP Groups, SNMP, ACL, System and Upgrade.

Description of buttons in SwOS configuration tool:

  • Append – add new item to the end of the list
  • Apply All – applies current configuration changes
  • Cut – removes item from the list
  • Clear – resets properties of the item
  • Discard Changes – removes unsaved configuration
  • Insert – add 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 password of the switch
  • Logout – logout from current Switch
  • Reboot – reboot the switch
  • Reset Configuration – reset configuration back to factory defaults
  • Choose File – browse for upgrade or backup file
  • Upgrade – upgrade firmware of the Switch
  • Restore Backup – restore Switch using selected backup file
  • Save Backup – generate and download backup file from the Switch


System Tab performs the following functions:

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

Note: 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.

Alt text

General settings

Property Description
Address Acquisition Specify which address acquisition method to use:

  • DHCP with fallback – for first 10 seconds switch uses DHCP client. If request is unsuccessful, then address is set as 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 service is accessible. Default value is ‘’ – any address
Allow From Ports List of switch ports from which the service is accessible
Allow From VLAN VLAN ID with which the service is accessible (VLAN Mode on ingress port must be other than disabled in order to connect)
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
Mikrotik Discovery Protocol Enable or disable Mikrotik neighbor discovery protocol
Port1 PoE In Long Cable If enabled, it will turn off short detection on all PoE out ports to allow use of longer ethernet cables. This is potentially dangerous setting and should be used with caution. (CSS106-1G-4P-1S model)
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 (CSS106 model, Read-only)

Health (CSS106-1G-4P-1S)

Alt text

CSS106-1G-4P-1S Health settings

Property Description
Voltage Shows the input voltage measured in volts
Temperature Shows PCB temperature in celsius temperature scale

Password and Backup

Alt text

CSS106 System Management Settings


Link Tab allows you to:

  • Configure Ethernet and SFP ports
  • Monitor status of Ethernet and SFP ports
Alt text

Link settings

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 (some SFP modules may required it disabled in order to work)
Speed Specify speed setting of the port (requires auto negotiation to be disabled)
Full Duplex Specify duplex mode of the port (requires auto negotiation to be disabled)
Flow control Enable or disable 802.3x Flow control

Note: Using SFP+ 1m/3m DAC cable or S-RJ01 module, the device always shows that link is established even if nothing is connected on other end.

PoE (CSS106-1G-4P-1S)

PoE settings configure Power over Ethernet output on CSS106-1G-4P-1S port2-port5 and show PoE status and measurements.

Alt text

CSS106-1G-4P-1S PoE Out settings
Property Description
PoE Out Sets PoE out mode of the port:

  • off – all detection and PoE out is turned off
  • auto – detection is done regarding resistance on the spare pairs to check if port has PoE capability. For port to be turned on measured value should be within range from 3kΩ to 26.5kΩ
  • on – PoE out is enabled regardless of the resistance on the port. Use this with caution as that can damage connected equipment!
  • calibr – manual port PoE out recalibration. It may be necessary if there are ocasional problems with powering connected devices.
PoE Priority Port priority for PoE out supply. If installation is going over power budged, port with the lowest priority is going to be turned off first. 1 – the highest priority port; 4 – the lowest priority port
PoE Status Current PoE out status of the port:

  • disabled – PoE out is turned off
  • waiting for load – “auto” mode detects out of range resistance to turn on PoE out
  • powered on – PoE out is turned on
  • short circuit – if it is detected, to ensure that there is no additional damage on powered device and no damage on powering device PoE out is turned off
  • voltage too low – not enough voltage supplied to turn on device with PoE out
  • current too low – not enough current supplied to turn on device with PoE out
  • waiting for cable disconnect – manual recalibration with “calibr” has detected connected device and waits for disconnection to complete the recalibration process
PoE Current Shows current usage on the port measured in miliamperes
PoE Power Shows PoE out power on the port measured in watts


SFP tab allows you to monitor status of SFP modules.

Alt text SFP Tab


Forwarding Tab provides advanced forwarding options among switch ports, port isolation, port locking, port mirroring and egress bandwidth limit features.

Ingress rate per port as well as rate for broadcast traffic can be configured with Access Control List by setting Rate. ACL must have one port per entry to provide bandwidth limiting properly.

Alt text
Property Description
Forwarding Forwarding table – allows or restricts traffic flow between specific ports
Port Lock
  • Port Lock – enable or disable MAC address learning on this port
  • Lock On First – enable or disable MAC address learning on this port (MAC address from the first recieved packet will still be learnt)
Port Mirroring
  • Mirror Ingress – whether traffic entering this port must be copied and forwarded to mirroring target port
  • Mirror Egress – whether traffic leaving this port must be copied and forwarded to mirroring target port
  • Mirror To – mirroring target port
Bandwidth Limit
  • Egress Rate – limit traffic leaving this port (bps)


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

Alt text CSS106 RSTP Settings
Property Description
RSTP Enable or disable STP/RSTP functionality on this port
Mode Shows STP/RSTP functionality mode on specific port (Read-only):
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)
  • edge – ports that are not supposed to receive any BPDUs, should be connected to end station (Read-only)
  • point-to-point – ports that operates in full-duplex links, can be part of STP and operate in 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
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: 10G – 2; 1G – 4; 100M – 10; 10M – 100
  • long: 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)

Statistics, Errors

Provides detailed information about received and transmitted packets.

Alt text
Alt text


VLAN configuration for Switch ports.

Alt text
Property Description
VLAN Mode VLAN mode for ingress port:

  • disabled – VLAN table is not used. Switch ignores VLAN tag part of tagged packets
  • optional – Handle packets with VLAN tag ID that is not present in VLAN table just like packets without VLAN tag
  • enabled – Drop packets with VLAN tag ID that is not present in VLAN table. Packets without VLAN tag are treat as tagged packets with Default VLAN ID
  • strict – Same as enable, but also checks VLAN support for inbound interface (drop packets with VLAN tag ID and ingress port that are not present in VLAN table)
VLAN Receive Defines the type of allowed packets on ingress port:

  • any – allows tagged and untagged packets on a certain port
  • only tagged – allows only packets with a VLAN tag
  • only untagged – allows only packets without a VLAN tag
Default VLAN ID Switch will treat both untagged and “Default VLAN ID” tagged ingress packets as they are tagged with this VLAN ID. It is also used to untag egress traffic if packet’s VLAN ID matches “Default VLAN ID”. The VLAN tag itself will only be added if there is VLAN Header = add if missing specified on egress port
Force VLAN ID Whether to apply Default VLAN ID to incoming packets with VLAN tag
VLAN Header
  • leave as is – if VLAN header is present it remains unchanged
  • always strip – if VLAN header is present it is removed from the packet
  • add if missing – if VLAN header is not present it is added to the packet (VLAN ID will be Default VLAN ID of ingress port)

Note: VLAN modes enabled and strict require VLAN ID 1 in VLANs table to allow access of untagged traffic to switch itself.



VLAN tables specifies certain forwarding rules for packets that have specific IEEE 802.1Q tag. Basically the table contains entries that map specific VLAN tag IDs to a group of one or more ports. Packets with VLAN tags leave switch through one or more ports that are set in corresponding table entry. VLAN table works together with destination MAC lookup to determine egress ports. VLAN table supports up to 4096 entries.

Alt text CSS106 VLANs settings
Property Description
VLAN ID VLAN ID of the packet
IVL Enables or disables independent VLAN learning (IVL)
IGMP Snooping 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.
Ports Each port has individual VLAN header options for each VLAN ID. Depending on VLAN mode if lookup is done in this table, egress action of packets is processed by this option. Egress option from VLAN tab is ignored.


This table represents dynamically learnt 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 switch receives a packet from certain port, it adds the packet’s source MAC address X and port it received the packet from to host table, so when a packet comes in with destination MAC address X it knows to which port it should forward the packet. If the destination MAC address is not present in host table then it forwards the packet to all ports in the group. Dynamic entries take about 5 minutes to time out.


Note: CSS106 series switches support 2048 host table entries.

Alt text Host table
Property Description
Port Ports the packet should be forwarded to (Read-only)
MAC Learned MAC address (Read-only)
VLAN ID Learned VLAN ID (Read-only)

Static Hosts

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 some more functionality.

Alt text
Property Description
Ports Ports the packet should be forwarded to
MAC MAC address
VLAN ID VLAN ID (only supported on RB260GS/RB260GSP)
Drop Packet with certain MAC address coming from certain ports can be dropped
Mirror Packet can be cloned and sent to mirror-target port

IGMP Groups

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.

First, enable option under System tab.

Alt text IGMP Snooping under System tab

Available IGMP snooping data can be found under IGMP Group tab:

Alt text CSS106 series IGMP Snooping

Possibility to enable IGMP Snooping for specific VLAN ID.

Alt text CSS106 series IGMP Snooping


SNMP Tab consists of settings to monitor the Switch remotely.

Available SNMP data:

  • System information
  • System uptime
  • Port status
  • Interface statistics
Alt text SNMP settings
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


An access control list (ACL) rule table is very powerful tool allowing wire speed packet filtering, forwarding and VLAN tagging based on L2,L3 protocol header field conditions. SwOS allow you to implement limited number of access control list rules (32 simple rules (only L2 conditions are used); 16 rules where both L2 and L3 conditions are used; or 8 advanced rules where all L2,L3 and L4 conditions are used). Each rule contains a conditions part and an action part.

Alt text

Access Control List settings

Conditions part parameters

Property Description
From 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:

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 IP protocol

Action part parameters

Property Description
Redirect To Whether to force new destination ports (If Redirect To is enabled and no ports specified in Redirect To Ports, packet will be dropped )
Redirect To Ports Destination ports for
Mirror Clones packet and sends it to mirror-target port
Rate Limits bandwidth (bps)
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


The CSS106-5G-1S and CSS106-1G-4P-1S 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 device is booting resets configuration and loads backup firmware SwOS 2.0p.
  • After loading backup firmware SwOS 2.0p it is possible to connect to using web browser and install new SwOS firmware.


Source link

Administrador AcessoWi-Fi.com – Gerente UnicoHost Soluções Web – Engenheiro de Redes

Julio Rossoni

Administrador AcessoWi-Fi.com - Gerente UnicoHost Soluções Web - Engenheiro de Redes

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