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Table of Contents


  • Full non-blocking wirespeed switching
  • Up to 2k MAC entries in the Host table
  • Forwarding Database works based on SVL or IVL
  • Port Isolation
  • Port Lock
  • Jumbo frame support - 9198 bytes
Spanning Tree Protocol
  • RSTP support
Multicast Forwarding
  • IGMP Snooping support
  • Port-based mirroring
  • 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 the protocol header fields

Connecting to the switch


Open your web browser and enter the IP address of your switch ( 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 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.

Address AcquisitionSpecify 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 AddressIP address of the switch in case of Address Acquisition is set as DHCP with fallback or static
IdentityName of the switch (for Mikrotik neighbor discovery protocol)
Allow FromIP address or network from which the switch is accessible. Default value is '' - any address.
Allow From PortsList of switch ports from which the service is accessible
Allow From VLANVLAN ID from which the service is accessible. Make sure to first configure VLANs and VLAN pages
WatchdogEnable or disable system watchdog. It will reset CPU of the switch in case of fault condition
Independent VLAN LookupEnable or disable independent VLAN lookup in the Host table for packet forwarding
IGMP SnoopingEnable or disable IGMP Snooping
IGMP Fast LeaveEnables or disables IGMP fast leave feature on the switch port. This property only has an effect when IGMP Snooping is enabled
Mikrotik Discovery ProtocolEnable or disable Mikrotik neighbor discovery protocol
Port1 PoE In Long CableIf enabled, it will turn off short detection on all PoE out ports to allow the use of longer ethernet cables. This is potentially dangerous setting and should be used with caution. (CSS106-1G-4P-1S model)
MAC AddressMAC address of the switch (read-only)
Serial NumberSerial number of the switch (read-only)
Board NameMikroTik model name (read-only)
VoltageShows the input voltage measured in volts (read-only, CSS106-1G-4P-1S model)
TemperatureShows PCB temperature in celsius temperature scale (read-only, CSS106-1G-4P-1S model)

Password and Backup



Link Tab allows you to:

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

EnabledEnable or disable port
NameEditable port name
Link StatusCurrent link status (read-only)
Auto NegotiationEnable or disable auto-negotiation (some SFP modules may require it disabled in order to work)
SpeedSpecify speed setting of the port (requires auto-negotiation to be disabled)
Full DuplexSpecify the duplex mode of the port (requires auto-negotiation to be disabled)
Flow controlEnable or disable 802.3x Flow control


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


The switch supports Jumbo frames up to 9198 bytes. Manually decreasing the MTU settings is not supported for SwOS devices. 


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

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 the port has PoE capability. For a port to be turned on measured value should be within a 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 occasional problems with powering connected devices.
PoE PriorityPort priority for PoE out supply. If the installation is going over available power budged, the 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, PoE out is turned off to ensure that there is no additional damage on the powered device and no damage on powering device
  • voltage too low - not enough voltage supplied to turn on the device with PoE out
  • current too low - not enough current supplied to turn on the 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 CurrentShows current usage on the port measured in milliamperes
PoE PowerShows PoE out power on the port measured in watts



The SFP tab allows you to monitor the status of SFP modules.


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

ForwardingForwarding table - allows or restricts traffic flow between specific ports
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
  • Lock On First - enable or disable MAC address learning on this port (MAC address from the first received packet will still be learned)
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
Bandwidth Limit
  • Egress Rate - limit traffic leaving this port (bps)



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

RSTPEnable or disable STP/RSTP functionality on this port
ModeShows STP/RSTP functionality mode on a specific port (read-only):
  • RSTP
  • STP
RoleShows 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 CostShows 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)
StateShows 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
Bridge Priority (hex)RSTP bridge priority for Root Bridge selection
Port Cost ModeThere 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 BridgeThe priority and MAC address of the selected Root Bridge in the network (read-only)

Statistics, Errors


Provides detailed information about received and transmitted packets.


VLAN configuration for switch ports.


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 ReceiveDefines 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 IDthe 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 the 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 the egress port
Force VLAN IDWhether 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)


CSS106 devices running SwOS version 2.12 can filter RSTP BPDU packets when enabling VLAN filtering on ports (VLAN Mode enabled or strict). With SwOS version 2.13, it is recommended to set VLAN Receive to any on trunk ports.


VLAN table specifies forwarding rules for packets that have an 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 the corresponding table entry. VLAN table works together with destination MAC lookup to determine egress ports. VLAN table supports up to 250 entries.

VLAN IDVLAN ID of the packet
IVLEnables or disables independent VLAN learning (IVL)
IGMP SnoopingEnables 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.
PortsEach port has individual VLAN header options for each VLAN ID. Depending on VLAN mode if lookup is done in this table, the egress action of packets is processed by this option. The egress option from the VLAN tab is ignored.

VLAN Configuration Examples


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 specifying the management VLAN ID in the System menu. After applying the configuration, the switch will only respond to tagged VLAN 200 packets on Port2 and untagged packets on Port3. The DHCP client will also work in the specified VLAN ID.



CSS106 series switches support 2048 host table entries.

PortPorts the packet should be forwarded to (read-only)
MACLearned MAC address (read-only)
VLAN IDLearned 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.

PortsPorts the packet should be forwarded to
MACMAC address
DropPacket with certain MAC address coming from certain ports can be dropped
MirrorPacket 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.


  • System information
  • System uptime
  • Port status
  • Interface statistics
  • Host table information

EnabledEnable or disable SNMP service
CommunitySNMP community name
Contact InfoContact information for the NMS
LocationLocation information for the NMS



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. SwOS allows you to implement a 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.

Conditions parameters

FromThe port that packet came in from
MAC SrcSource MAC address and mask
MAC DstDestination MAC address and mask
EthertypeProtocol encapsulated in the payload of an Ethernet Frame

VLAN header presence:

  • any
  • present
  • not present
PriorityPriority 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
ProtocolIP protocol

Action parameters

Redirect ToWhether to force new destination ports (If "Redirect To" is enabled and no ports are specified in "Redirect To Ports", a packet will be dropped )
Redirect To PortsRedirect destination ports
MirrorClones packet and sends it to mirror-target port
RateLimits bandwidth (bps)
Set VLAN IDChanges the VLAN tag ID, if VLAN tag is present
PriorityChanges the VLAN tag priority bits, if VLAN tag is present



The CSS106-5G-1S and CSS106-1G-4P-1S have built-in backup SwOS firmware which can be loaded in case standard firmware breaks or upgrade fails: