SwOS (MikroTik Switch OS) Administration Guide


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SwOS is an operating system designed specifically for administration of MikroTik Switch products that use Switch OS (SwOS) for RB250GS and now RB260GS with SFP Port for extend the network to up to 20KM ans support VLAN and VLAN Trunk on Gigabit Ethernet.

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SwOS (MikroTik Switch OS) Administration Guide

  1. 1. SwOS 1 SwOS Summary 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. Connecting to the Switch Open your web browser and enter IP address of your Switch ( by default) and login screen will appear. 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 Interface Overview SwOS interface menu consists of 10 tabs: Link, Forwarding, Statistics, VLAN, VLANs, Static Hosts, Hosts, SNMP, ACL and System. 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
  2. 2. SwOS 2 • 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 System Tab performs the following functions: •• General information about Switch •• Switch management •• Configuration reset •• Backup and restore configuration •• Firmware upgrade Property Description IP Address IP address of the Switch 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) Mikrotik Discovery Protocol Enable or disable Mikrotik neighbor discovery protocol Watchdog Enable or disable system watchdog. It will reset CPU of the switch in case of fault condition MAC Address MAC address of the Switch (Read-only) Version Firmware version of the Switch Uptime Current Switch uptime
  3. 3. SwOS 3 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. Firmware Upgrade Firmware can be upgraded/downgraded by selecting firmware file and pressing upgrade button. Switch will reboot automatically after successful upgrade. Note: Manual power cycle is necessary 5 seconds after upgrade button is pressed if you are upgrading from SwOS v1.0 Link Tab Link Tab allows you to: •• Configure Ethernet ports •• Monitor status of Ethernet ports Property Description Enabled Enable or disable port 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 to specify) Full Duplex Specify duplex mode of the port (requires auto negotiation to be disabled to specify) Flow control Enable or disable flow control
  4. 4. SwOS 4 Forwarding Tab Forwarding Tab provides advanced forwarding options among switch ports, port locking, port mirroring, bandwidth limit and broadcast storm control features. 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 • Ingress Rate - Limit traffic entering this port (bps) (only supported on RB250GS) • Egress Rate - Limit traffic leaving this port (bps) Broadcast Storm Control • Storm Rate - Limit the number of broadcast packets transmitted by an interface (only supported on RB250GS) • Include Unicast - Include unicast packets without an entry in host table in Storm Rate limitation (only supported on RB250GS)
  5. 5. SwOS 5 Statistics Tab Provides detailed information about received and transmitted packets. Packet Flow Packet processing through RB250GS is described here: Atheros8316 packet flow diagram [1] VLAN Tab VLAN configuration for Switch ports.
  6. 6. SwOS 6 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 / only tagged / only untagged (only supported on RB260GS) Default VLAN ID Switch will treat untagged ingress packets as they are tagged with this VLAN ID. VLAN tag itself will be added only 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. Example • 802.1Q Trunk [2] • 802.1Q Trunk with two switches [3] VLANs Tab VLAN tables specifies certain forwarding rules for packets that have specific 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. RB250GS VLANs tab
  7. 7. SwOS 7 Property Description VLAN ID VLAN ID of the packet Ports Ports the packet should be mapped to RB260GS VLANs tab Property Description VLAN ID VLAN ID of the packet 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. Hosts Tab This table represents dynamically learnt MAC address to port mapping entries. When Switch receives a packet from certain port, it adds the packets 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: RB250GS and RB260GS support 2048 host table entries.
  8. 8. SwOS 8 Property Description MAC MAC address (Read-only) Ports Ports the packet should be forwarded to (Read-only) Static Hosts Tab Static host table entries. 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. Property Description MAC MAC address Ports Ports the packet should be forwarded to Mirror Packet can be cloned and sent to mirror-target port Drop Packet with certain MAC address coming from certain ports can be dropped ACL Tab 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.
  9. 9. SwOS 9 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: •• any •• present •• not present VLAN ID VLAN tag ID Priority Priority in VLAN tag IP Src (IP/netmask:port) Source IP address, netmask and L4 port number IP Dst (IP/netmask:port) Destination IP address, netmask and L4 port number Protocol IP protocol DSCP IP DSCP field 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) (only supported on RB260GS) 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 SNMP Tab SNMP Tab consists of settings to monitor the Switch remotely. Available SNMP data: •• System information •• System uptime •• Port status •• Interface statistics
  10. 10. SwOS 10 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 Reinstall SwOS firmware It is possible to upload and install SwOS firmware using BOOTP. This example shows how to reinstall SwOS using RouterOS. Note: Each RouterBoard switch model has its own firmware which cannot be installed on other models. •• RB250GS supports SwOS v1.0 and newer. •• RB260GS supports SwOS v1.7 and newer. •• Configure IP address and DHCP server with BOOTP enabled on the installation router. /ip address add address= interface=ether1 /ip pool add name=dhcp_pool1 ranges= /ip dhcp-server add address-pool=dhcp_pool1 bootp-support=dynamic interface=ether1 disabled=no /ip dhcp-server network add address= gateway= •• Upload new SwOS firmware file to the router filesystem. [admin@MikroTik] /file> print # NAME TYPE SIZE CREATION-TIME 0 swos-1.2.lzb .lzb file 38142 sep/02/2010 08:40:17 •• Configure TFTP server. /ip tftp add allow=yes disabled=no ip-addresses= read-only=yes real-filename=swos-1.2.lzb •• Hold the RESET button of the switch when starting it. •• After few seconds ACT LED will start blinking. Wait till ACT LED blinks twice as fast and release RESET button. •• Make ethernet connection between the switch and ethernet port you configured DHCP server on. After few seconds new firmware should be successfully uploaded and installed.
  11. 11. SwOS 11 References [1] http://wiki.mikrotik.com/wiki/Manual:Packet_flow_through_Atheros8316 [2] http://wiki.mikrotik.com/wiki/SwOS/Router-On-A-Stick [3] http://wiki.mikrotik.com/wiki/SwOS/SWOS-802.1Q-TrunkTwoSwitches
  12. 12. Article Sources and Contributors 12 Article Sources and Contributors SwOS  Source: http://wiki.mikrotik.com/index.php?oldid=25593  Contributors: Becs, Kirshteins, Marisb, Normis Image Sources, Licenses and Contributors File:swos_login.png  Source: http://wiki.mikrotik.com/index.php?title=File:Swos_login.png  License: unknown  Contributors: Kirshteins Image:Icon-note.png  Source: http://wiki.mikrotik.com/index.php?title=File:Icon-note.png  License: unknown  Contributors: Marisb, Route File:swos_system.png  Source: http://wiki.mikrotik.com/index.php?title=File:Swos_system.png  License: unknown  Contributors: Kirshteins File:swos_link.png  Source: http://wiki.mikrotik.com/index.php?title=File:Swos_link.png  License: unknown  Contributors: Kirshteins File:swos_forwarding.png  Source: http://wiki.mikrotik.com/index.php?title=File:Swos_forwarding.png  License: unknown  Contributors: Kirshteins File:swos_statistics.png  Source: http://wiki.mikrotik.com/index.php?title=File:Swos_statistics.png  License: unknown  Contributors: Kirshteins File:swos_vlan.png  Source: http://wiki.mikrotik.com/index.php?title=File:Swos_vlan.png  License: unknown  Contributors: Kirshteins File:rb250gsvlans.png  Source: http://wiki.mikrotik.com/index.php?title=File:Rb250gsvlans.png  License: unknown  Contributors: Becs File:rb260gsvlans.png  Source: http://wiki.mikrotik.com/index.php?title=File:Rb260gsvlans.png  License: unknown  Contributors: Becs File:swos_hosts.png  Source: http://wiki.mikrotik.com/index.php?title=File:Swos_hosts.png  License: unknown  Contributors: Kirshteins File:swos_static_hosts.png  Source: http://wiki.mikrotik.com/index.php?title=File:Swos_static_hosts.png  License: unknown  Contributors: Kirshteins File:swos_acl.png  Source: http://wiki.mikrotik.com/index.php?title=File:Swos_acl.png  License: unknown  Contributors: Kirshteins File:swos_snmp.png  Source: http://wiki.mikrotik.com/index.php?title=File:Swos_snmp.png  License: unknown  Contributors: Kirshteins
  13. 13. SwOS/SWOS-802.1Q-TrunkTwoSwitches 1 SwOS/SWOS-802.1Q-TrunkTwoSwitches By: Steve Discher, LearnMikroTik.com, 11-27-12 Scenario: You have one RB250GS switch running 802.1Q vlans and you want to extend all or some of those vlans to a second switch. The following diagram borrowed from a post by Ozelo explains: The configuration of the first switch ( is explained in a previous example 802.1Q Router on a Stick Example [1] . The main change to that example is the configuration of port ether5 since we want it to pass all the vlans to the second switch. The two pales you need to make changes are the VLAN tab and the VLANs tab. Confusing, yes but note the "s" on VLAN on one tab. Configure the first switch as follows: Switch 1 - VLAN Tab
  14. 14. SwOS/SWOS-802.1Q-TrunkTwoSwitches 2 Switch 1 - VLANs Tab Then configure the second switch as follows. Please note we have set the IP address of the second switch to so as not to duplicate the witch 1 IP address. This is done on the System tab. In case you ever wonder why there is no setting for netmask or default gateway, that is because the switch does a little magic in determining the source of the packet and returning it to the host without the need for those two pieces of information. Switch 2 - VLAN Tab
  15. 15. SwOS/SWOS-802.1Q-TrunkTwoSwitches 3 Switch 2 - VLANs Tab All that remains is to create the vlan interfaces on the router and assign IP addresses, DHCP server, etc. to them. Here is a screen shot of the router used for this example, interfaces and IP addresses. The IP here is the one being used to manage the switches:
  16. 16. SwOS/SWOS-802.1Q-TrunkTwoSwitches 4 That is it, you should now have two switches trunked together passing vlans to the second switch. References [1] http://wiki.mikrotik.com/wiki/SwOS/Router-On-A-Stick
  17. 17. Article Sources and Contributors 5 Article Sources and Contributors SwOS/SWOS-802.1Q-TrunkTwoSwitches  Source: http://wiki.mikrotik.com/index.php?oldid=24716  Contributors: Sdischer Image Sources, Licenses and Contributors File:OverallDiagram.png  Source: http://wiki.mikrotik.com/index.php?title=File:OverallDiagram.png  License: unknown  Contributors: Sdischer File:Switch1-1.png  Source: http://wiki.mikrotik.com/index.php?title=File:Switch1-1.png  License: unknown  Contributors: Sdischer File:Switch1-2.png  Source: http://wiki.mikrotik.com/index.php?title=File:Switch1-2.png  License: unknown  Contributors: Sdischer File:Switch2-1.png  Source: http://wiki.mikrotik.com/index.php?title=File:Switch2-1.png  License: unknown  Contributors: Sdischer File:Switch2-2.png  Source: http://wiki.mikrotik.com/index.php?title=File:Switch2-2.png  License: unknown  Contributors: Sdischer File:Interfaces.png  Source: http://wiki.mikrotik.com/index.php?title=File:Interfaces.png  License: unknown  Contributors: Sdischer File:IPAddresses.png  Source: http://wiki.mikrotik.com/index.php?title=File:IPAddresses.png  License: unknown  Contributors: Sdischer
  18. 18. SwOS/Router-On-A-Stick 1 SwOS/Router-On-A-Stick Router-On-A-Stick - 802.1Q Trunking With MikroTik By: Steve Discher, LearnMikroTik.com, Updated 3-24-13 Router-On-A-Stick is a phrase referring to the connection of a 802.1Q capable switch to a single router interface. By trunking across the Ethernet interface and assigning separate Vlans to each of the switch's ports or groups of ports, it is possible to create a configuration that simulates a router with many separate physical Ethernet interfaces. Consider the following example: In this example, a router with a single Ethernet interface is trunked to a MikroTik switch. In practice, this same configuration can be used between two switches or two routers. The purpose of this article is to show the steps required to setup the MikroTik RB250GS switch as a trunked switch in the router-on-a-stick configuration. To log into the RB250GS switch, simply web browse to from a computer on the same physical network segment with an IP on the same subnet, The default user name is admin with no password. All settings may be left at the defaults with the exception of a few. In this example we are using Vlan Id's 1, 200, 300 and 400. Note that the switch will respond to http requests to its IP address on all ports. This behavior is a bit different than Cisco IOS that responds to untagged traffic via an IP bound to Vlan 1. The way the OS is built, there is no need for a default gateway or a subnet mask. NOTE: Once you set port 1 to "trunk" mode, you will not longer be able to communicate with the switch unless you create a Vlan1 on your router. Selection of the Vlan ID and the assignment to the ports is your choice, decide what Vlan ID's you will use and where you will assign them.
  19. 19. SwOS/Router-On-A-Stick 2 In this example we need two ports for devices on Vlan 300 on Ports 3 & 5 and one port for device on Vlan 400 on Port 4 and one port for a device on Vlan 200 on port 2. NOTE: Before starting configuration, it is assumed you have bound to your laptop and the switch is at the default Ip of You must be accessing thes switch via ehter2 through ether5 since you are about to turn ether1 into a trunk port and you will lose communication with the switch at that point on ether1. 1. Begin by clicking on the VLAN tab and make the following changes, assuming the trunk port will be Port1 (the port that is connected to the router). 2. The VLAN page determines how the switch strips the Vlan tags with specific Vlan ID's from the packets as they exit these ports. Setting Port 1 to Vlan Mode "enabled" and VLAN Header to "add if missing" makes Port 1 a trunk port. 3. When done, your VLAN page should look similar to this: 4. Next, click on the VLANs tab. This is where you create the Vlan Id's to be used on the switch and on which ports these tags will be applied. So, for example, in this scenario, if I create a Vlan interface on the router with a Vlan ID of 10, that traffic will appear on the switch on port 2. Likewise Vlan 30 will be on port 3 and Vlan 40 on port 4. The trunk port is port 1. NOTE: You must also create Vlan1 but it is not necessary to assign it to any ports, just create it. 5. Here is the example:
  20. 20. SwOS/Router-On-A-Stick 3 6. The last step is to change the IP address, system identity and the password on the System tab and configure the router. The router configuration is a standard one for Vlans, create Vlan interfaces attached to the Ethernet interface that is connected to the switch (in this example Ether1) and match the Vlan ID numbers you assigned to the switch. Then bind your IP addresses to the Vlan interfaces. Here is the router interface configuration:
  21. 21. SwOS/Router-On-A-Stick 4 NOTE: The management IP for the switch is handled a bit differently. You must create a Vlan1 with ID=1 on the physical interface that will trunk to the switch. Then bind your management IP to that Vlan1 interface. In the example above, you would bind to Vlan1 and then you can access the switch through the trunk port.
  22. 22. Article Sources and Contributors 5 Article Sources and Contributors SwOS/Router-On-A-Stick  Source: http://wiki.mikrotik.com/index.php?oldid=25093  Contributors: Sdischer Image Sources, Licenses and Contributors File:RouterOnAStick.png  Source: http://wiki.mikrotik.com/index.php?title=File:RouterOnAStick.png  License: unknown  Contributors: Sdischer File:VLAN.png  Source: http://wiki.mikrotik.com/index.php?title=File:VLAN.png  License: unknown  Contributors: Sdischer File:VLANs.png  Source: http://wiki.mikrotik.com/index.php?title=File:VLANs.png  License: unknown  Contributors: Sdischer File:2012-11-27 15-58-28.jpg  Source: http://wiki.mikrotik.com/index.php?title=File:2012-11-27_15-58-28.jpg  License: unknown  Contributors: Sdischer File:IPAddresses.png  Source: http://wiki.mikrotik.com/index.php?title=File:IPAddresses.png  License: unknown  Contributors: Sdischer