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VLAN Tagging on Trunk

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  • 1.  VLAN Tagging on Trunk

    Posted Jan 19, 2017 10:55 PM
    Question:-
    When we create Trunk between two procurve switches and we need to Tag vlans on that trunk to extend Vlan to another switch, do we have to assign a ip adress to Vlan on both switches or just only one switch.?


  • 2.  RE: VLAN Tagging on Trunk

    Posted Jan 19, 2017 11:12 PM
    I had two layer 3 Procurve switches and they are connected via trunk and i want to extend vlans on Switch A to Switch B, Switch A had all Vlans assigned IP address and if i extend those Vlans to Switch B via Trunk do i need to assign same IP adress on Vlans on Switch B also or not.?


  • 3.  RE: VLAN Tagging on Trunk

    Posted Jan 20, 2017 02:02 AM

    A Layer-3 Instance has nothing to do with a Layer-2 vlan. you do not need an SVI. You just have to ensure that the vlans exists on both switches, either manually create them on your second switch or use GVRP to distribute your VLANS across your switches. Ensure also that the interface for interconnection is transmitting the vlan.

    ex. switch A 4 ports prepared as uplink trunk to interconnect other switches via port 21-24

    vlan 11
       name "marketing"
       tagged 21-24
       exit
    vlan 12
       name "supp"
       tagged 21-24
       exit
    vlan 13
       name "WLAN"
       tagged 21-24

     


    #dot1q
    #VLAN
    #Trunk


  • 4.  RE: VLAN Tagging on Trunk

    Posted Jan 20, 2017 06:06 AM

    You only need an IP address for the Vlans if you are going to do L3 stuff like routing or DHCP server/relay.

     



  • 5.  RE: VLAN Tagging on Trunk

    Posted Jan 20, 2017 09:19 AM
    Yes inam going to do a L3 Stuff and routing, and i want to extend vlans from a switch A to Seitch B, i created Vlans with same id on Switch B and had a 2 port trunk between 2 switches, Vlans on Switch A had ip address assigned, do i have to assign Ip on vlans on switch B or not.?


  • 6.  RE: VLAN Tagging on Trunk

    Posted Jan 23, 2017 10:13 AM

    NO

    you do not have to...

    your traffic is switched and transported in Layer-2, if you only want to "leave" your vlan on side-A (route) thats fine.

    If you a speaking of 2-port trunk than that is link-aggregation via static or LACP (802.3ad) as long as you have on both sides

    vlan A
        tagged trk<X>
        exit
    vlan B
        tagged trk <x>
    ...
    ...
    vlan N
        tagged trk<X>

    sending all your needed vlans into the trunk

    The term trunk is different interpreted between vendors some mean with it an 802.1q trunk (vlan tagging)

    others refer to is as 802.3ad trunk (link aggregation of ports) either static or with the LACProtocol