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  1. #1

    Issue with connecting several TL-SG108E switches

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    Firmware Version :

    ISP : [/COLOR]

    Dear community,

    I have searched and tried a lot of things but none are working so far. Now I am lost, a bit ashamed too as I have computer - with a bit of network - background

    Due to the architecture of my house, I have to chain switches. I bought 3 managed switches to have a proper configuration in the future, but right now it breaks my network.

    Configuration is the following: Classic Internet box --> TL-SG108E "basement" --> TL-SG108E "tv" --> TL-SG108 "Desk"

    - Each switch has several devices connected, for instance 1) in the basement I have 2 PCs used as NAS or 2) in the TV I have the TV, PlayStation or Apple TV and finally 3) desk I have 2 PC
    - I upgraded to latest firmware each switch
    - I have brand new cables, Maximum length of cable is 15 meter.
    - Each switch is configured with DHCP setting : enabled
    - I triple checked - I don't have cable loops (a cable plugged in the same switch)
    - I use port 1 to plug the cable from where Internet arrives

    Problem is the following:
    - I have internet in the basement, but I don't have internet after (e.g. Tv, desk) - but within each switch devices are able to communicate (e.g. I can stream from my mac to the apple tv)
    - When replacing "tv" by an unmanaged switch, I have internet everywhere. and there's no problem anymore.

    it seems that TV and basement switches are not able to communicate together, as replacing TV by a basic one solves the issue.

    I have tried, and played with configuration such as deactivating all VLANs . Without success.

    I would be quite thankful for your help onn this.

  2. #2
    I should mention that I followed a TP Link guide to configure VLAN with 802.1Q. Although familar with VLAN, I dont find the configuration clear.

    I tried the following without success. I basically dont need several VLAN, so I tried to configure only 1
    TL-SG108E "basement" --> Port 1 is plugged to the internet box, port 8 goes to the TV switch
    -- I added VLAN 101 with members ports 1-8 with Port 8 tagged
    -- In PVID settings, I assigned VLAN to 2-7

    TL-SG108E "tv" --> Port 1 is connected to port 8 of basement switch and port 8 goes to Desk switch
    -- I added VLAN 101 with members ports 1-8 with Port 1,8 are tagged. <--- Not sure I should actually tag port 1 as it's not a trunk line to another switch.
    -- In PVID settings, I assigned VLAN to 2-7

    TL-SG108 "Desk" --> Port 1 is connected to the TV switch
    -- I added VLAN 101 with members ports 1-8 with Port 1 tagged
    -- In PVID settings, I assigned VLAN to 2-8

  3. #3
    Members R1D2 is on a distinguished road
    Join Date
    Dec 2015
    Assign each switch an unused static IP from your network. Don't use DHCP if you chain those switches.

    As for the VLAN: if you just use one VLAN, you don't need it at all. It just does not make sense to use VLANs if all devices belong to the same (logical) network.

    But if you want to use VLANs: what do you mean with "In PVID settings, I assigned VLAN to 2-8"? You need to set PVID 101 for untagged ports if you want to use this VLAN, but not to tagged ports! Also make sure you have the 2018 firmware, since this fixes a long-standing problem with the Default_VLAN 1, to which all ports belong by default.

  4. #4
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  5. #5
    First you list two TL-SG108E and one TL-SG108. The 'E' on the end is significant because the 108E is a managed switch and the 108 is a "plain" switch. I'll assume that you have three 108E switches.

    I have to comment that managed switches seem to be a bit of an over complication for your application. A network with a single TL-SG108E will work OK out of the box. Interconnecting multiple 108E's requires some advanced planning to get the configuration right.

    As R1D2 suggests, part of the planning is to assign each switch a static IP within the subnet you are using. Also, you must decide what network device is going to handle the DHCP role. Unless you are setting up an advanced segmented network, you can have only one DHCP server on your network.

    Once you have your network plan is set, the best thing to do is to start from scratch. Do a factory reset on both switches (use a paper clip or fine tipped pen to press the Reset button for 6 seconds). Next you REALLY need to use the East Smart Configuration Utility software to configure these switches. Trying to use the web interface is painful at best. The config utility should installed on a Windows machine (it MUST be windows) and be directly connected to the switch that is directly connected to the Internet (just makes it simple).

    You will need to know the MAC address of your switches to do the initial configuration. It can be found on a label on the underside of the switches.

    It helps if you put everything together on a table and connect them with short Cat5e cables. Power up the switches and boot the PC. Run the config utility. The Discovered Switches page will display and hopefully all three switches will be listed. This is where the MAC address comes in. On the line with the MAC address for your first switch (the one the PC is direct connected), click on the gear icon in the IP Setting column. In the IP Settings pop-up enter an appropriate name for the switch in the Device Description field, then complete the IP address, subnet mask, and default gateway. Enter 'admin' and 'admin' in the User Name and Password fields. Leave DHCP disabled! Click Apply and Yes. Repeat for the other two switches.

    One final note: Unless you ABSOLUTELY need VLANs (e.g. you need to segment your network for security reasons), do not use them. Properly configuring VLAN's is complicated unless you have a good grasp of Ethernet (layer 2) protocols and concepts such as port ingress and egress rules, port VLID assignment, etc. In most cases you will need a DHCP server that is capable of assigning IPs from different scopes based upon VLID and one or more Layer 3 switches (big $$$$).


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