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  1. #1

    Question [SG105E] 2 VLANs, 2 Networks -> 2 Uplinks from 2 Routers

    Model : TL-SG105E

    Hardware Version : Not Clear

    Firmware Version :

    ISP : [/COLOR]

    Hi all,

    going to buy a SG105E switch to run 2 VLANs to connect 2 or 3 ports with two different networks. As an example:

    Net01: 192.168.1.0/24
    Net02: 192.168.5.0/24

    Router01 Uplink -> Port 01 (Switch)
    Router02 Uplink -> Port 02 (Switch)

    Port 03-05 should be connected to both networks via vlan.
    As I have already read it is not working like a classic cisco switch (command line e.g.) or similar and the default vlan could not be removed or secured.

    So, the question is: Is there any hope to get it configured and running like this?

    Thanks & Greetings,
    stormy

  2. #2
    Members R1D2 is on a distinguished road
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    Quote Originally Posted by stormy2211 View Post
    As I have already read it is not working like a classic cisco switch (command line e.g.) or similar and the default vlan could not be removed or secured.
    No VLAN-capable switch lets you "remove" the default/native/primary VLAN, since this is what PVID (the Primary VLAN ID) is for on any port, be it a port assigned to only one network ("access" port) or a port assigned to several networks/VLANs ("trunk" port) in addition to its primary network. This behavior is demanded by the 802.1Q standard, which does not mention the terms "access" and "trunk" ports at all.

    So, the only drawback of SG105E/108E is 1) that the primary VLAN for trunk ports is fixed to VID 1 on egress (meaning even VLAN1-tagged packets will be forwarded untagged on a trunk), 2) that you cannot remove port membership from VLAN1 (meaning every port is always able to receive untagged frames sent over the trunk) and 3) that the switch's UI is - so to say - constant member of VLAN1 (meaning it can be reached through any other VLAN).

    If you can accept this - for example because you can ensure that a) VID1 is not used outside the switch and b) untagged packets never appear on the trunk -, then yes, this switch can distribute two network uplinks to the three remaining (tagged) ports with isolation between the VLANs.

    If you need further control over the default/native/primary VLAN or if you need to have the switch's Web-UI respond only in a mgmt VLAN (but not to clients in Net01/Net02), then a TL-SG2008 would fit better IMHO.
    Last edited by R1D2; 10-24-2017 at 21:18.

  3. #3
    Thanks for the details - your answer is a great help to choose. I will have a further look at the TL-SG2008.


 

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