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  • 1.  3Com 4500 VLAN Config help needed

    Posted Jul 05, 2018 08:39 AM

    Hi Guys,

    I need some assistance with configuring VLANs on a 3Com 4500 switch. My role doesn't really involve looking after network gear but this issue has now ended up on my lap and I'm looking for some guidance please.

    An unused 3Com 4500 switch was recently replaced under HPs lifetime warranty support and the replacement unit is an exact same refurbished model. We recently extended our office to another building next to our existing building. A new fibre circuit was installed connecting to the two buildings (fibre to ethernet media converter each side). Connectivity is good but I need to run two different VLANs to the new building. Environment is as follows.

    Building A:

    Procurve 2510G (core)
    VLAN 1 - 10.207.1.x
    VLAN 6 - 10.209.1.x

    Ports 1-44 is VLAN 6 Untagged
    Ports 45-48 is VLAN1 Untagged
    Port 47 is VLAN6 tagged

    Port 47 is the port which has the fibre to building B connected

    Building B:

    3Com 4500 (core)
    VLAN 1 - 10.207.1.x
    VLAN 6 - 10.209.1.x

    Ports 1-46 is VLAN 6 Untagged
    Ports 47-48 is VLAN 1 Untagged
    Port 48 is in "Hybrid mode" and is also VLAN 6 tagged

    Port 48 is the port which has the fibre to building B connected

    From what I've read is that the uplink port (48) has to be in hybrid mode to carry multiple VLANs. The commands I ran are below:

    interface Ethernet1/0/48
     port link-type hybrid
     port hybrid vlan 1 untagged
     port hybrid vlan 6 tagged

    The issue I'm facing that any device on VLAN 6 in building A is not able to communicate with any host on VLAN 6 in building B and vice versa.

    I'm doing things wrong somewhere. Any advice appreciated.



  • 2.  RE: 3Com 4500 VLAN Config help needed

    Posted Jul 05, 2018 09:45 AM

    Greetings Dvillijg,

    Standard trunk configuration on 4500G can also handle multiple vlans. In
    your case:

    port link-type trunk
    port trunk permit vlan 1 6

    Hope this helps


    --
    Kindest Regards,

    Frankie Cruz
    Network Administrator
    Lehigh Carbon Community College
    4525 Education Park Drive
    Schnecksville, PA 18078



  • 3.  RE: 3Com 4500 VLAN Config help needed

    Posted Jul 09, 2018 08:56 AM

    can you share output of dis int e1/0/48 and an equivalent of this from procurve int 47



  • 4.  RE: 3Com 4500 VLAN Config help needed

    Posted Jul 11, 2018 08:01 PM

    The order to do this in is:

    Do you have link lights?
    What does a show lldp neighbour command show? (May need to switch LLDP on on both switches)
    Can the switches talk to each other on either VLAN?

    And as above, don't use "hybrid", just use "trunk", although the "hybrid" config should be working fine for you.



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