modified on 20 lip 2010 at 09:20 ••• 19 589 views

SwOS

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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 (192.168.88.1 by default) and login screen will appear.

File:swos_login.png

SwOS default IP address: 192.168.88.1, 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
  • Choose File - browse for upgrade file
  • Upgrade - upgrade firmware of the Switch

System Tab

System Tab performs the following functions:

  • General information about Switch
  • Switch management
  • Configuration reset
  • Firmware upgrade

Property Description
IP AddressIP address of the Switch
IdentityName of the Switch (for MikroTik neighbor discovery protocol)
Allow FromIP address from which the service is accessible. Default value is '0.0.0.0/0' - any address.
WatchdogEnable or disable system watchdog. It will reset CPU of the switch in case of fault condition
MAC AddressMAC address of the Switch (Read-only)
VersionFirmware version of the Switch
UptimeCurrent Switch uptime


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.

Link Tab

Link Tab allows you to:

  • Configure Ethernet ports
  • Monitor status of Ethernet ports

Property Description
EnabledEnable or disable port
Link StatusCurrent link status (Read-only)
Auto NegotiationEnable or disable auto negotiation
SpeedSpecify speed setting of the port (requires auto negotiation to be disabled to specify)
Full DuplexSpecify duplex mode of the port (requires auto negotiation to be disabled to specify)
CrossoverDetect crossover cable (Read-only)
Flow control Enable or disable flow control

Forwarding Tab

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

Property Description
ForwardingForwarding 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 Outgress - Whether traffic leaving this port must be copied and forwarded to mirroring target port
  • Mirror To - Mirroring target port
Bandwidth Limit
  • Ingres Rate - Limit traffic entering this port (bps)
  • Outgres Rate - Limit traffic leaving this port (bps)
Broadcast Storm Control
  • Storm Rate - Limit the number of broadcast packets sent by an interface
  • Include Unicast - Include unicast packets without an entry in host table in Storm Rate limitation

Statistics Tab

Provides detailed information about received and transmitted packets.

VLAN Tab

VLAN configuration for Switch ports.


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)
Default VLAN IDVLAN ID for untagged packets when VLAN Mode "enabled" or "strict" is used
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)

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.

Property Description
VLAN IDVLAN ID of the packet
PortsPorts the packet should be mapped to

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.

Property Description
MACMAC address (Read-only)
PortsPorts 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
MACMAC address
PortsPorts the packet should be forwarded to
DropPacket can be cloned and sent to mirror-target port
MirrorPacket 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 matchers. SwOS allow you to implement limited number of access control list rules (32 simple rules (either L2 or L3 matchers are used) or 16 complex rules (both L2 and L3 matchers are used)).

Each rule contains a matching part and an action part.

Matching part parameters

Property Description
FromMatch port that packet came in from
MAC SrcMatch by source MAC address and mask
MAC DstMatch by destination MAC address and mask
EthertypeMatch by protocol encapsulated in the payload of an Ethernet Frame
VLAN

Match by VLAN header presence:

  • any
  • present
  • not present
VLAN IDMatch by VLAN tag ID
PriorityMatch by priority in VLAN tag
IP SrcMatch by source IP address and mask
IP DstMatch by destination IP address and mask
ProtocolMatch by IP protocol
DSCPMatch by IP DSCP field

Action part parameters

Property Description
Redirect ToWhether to force new destination ports (If Redirect To is enabled and no ports specified in Redirect To Ports, packet will be dropped )
Redirect To PortsDestination ports for
MirrorClones matching packets and send them to mirror-target port
Set VLAN IDChanges the VLAN tag ID, if VLAN tag is present
PriorityChanges the VLAN tag priority bits, if VLAN tag is present

Example

Following example will show to drop ICMP packets destined to Switch itself. It will be impossible to ping Switch on port 5.

SNMP Tab

SNMP Tab consists of settings to monitor the Switch remotely.

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