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In certain scenarios (e.g. VoIP) it is advisable to flag tag the network communication with the EF flag flag (Expedited Forwarding), in order for this network traffic to be forwarded preferentially. If network participants cannot set the EF flag themselbes, it has to be set by a switch.
This article describes how communication in a certain VLAN can be flagged tagged with the EF flag on a GS-3xxx series switch.
Requirements:
- LCOS SX as of version 4.00 (download latest version)
- Any web browser for accessing the webinterface of the switch
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- Port Members: Select the ports whose traffic is to be prioritized (in this example the ports 5 - 16).
- VID: In the dropdown menu select the option Specific and in the field Value enter the VLAN whose packets are to be prioritized (in this example the VLAN 10).
- Frame Type: In the dropdown menu select the option IPv4.
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If needed necessary you can specify the conditions more precisely, e.g. by setting a certain source MAC address (SMAC) or a certain source address range (SIP). If traffic from network participants connected to another switch is to be prioritized, the uplink port to this switch has to be set as Port Member. |
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3) In the dropdown menu for DSCP select the option 46 (EF). Thereby the specified packets from step 2) are flagged tagged with the EF flag and forwarded preferentially.
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5) Select the option Enable for Egress Rewrite for all ports a network participant is connected to, who that is to receive the prioritized packets (in this example the ports 1, 27 and 28).
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6) When you are finished, click the disk icon in the top right corner to save the configuration as the start configuration.
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The start configuration is retained even if the device is restarted or there is a power failure. |
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