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IRB interfaces and physical interface associated

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  • 1.  IRB interfaces and physical interface associated

    Posted 07-02-2020 00:58

    Hi Alll,

     

    I have a basic question with regards to IRB interfaces and the physical interface associated to it.

    HW: qfx 5100

    sw version: 19.4R1.10

    Assumin g a config like

    vlans {
        Test {
            vlan-id 4;
            l3-interface irb.4;
        }
    

    I would like to understand if there is one command in which is clear the association between irb and the physical interface.

    I know the concept of irb, i know the concept of vlan.

    Thanks.

     



  • 2.  RE: IRB interfaces and physical interface associated

     
    Posted 07-02-2020 01:04

    Hi ,

     

    What relate the physical interface to irb is the vlan , you add the vlan as a member vlan under physical interface , and you specify irb interface as the layer 3 routing interface for that vlan .

     

     

    If this solves your problem, please mark this post as "Accepted Solution."



  • 3.  RE: IRB interfaces and physical interface associated

     
    Posted 07-02-2020 01:11

    Hi,

     

    regarding the command to relate , what you can do is to check which physical interfaces are allowing the vlan and check the routing interface for the vlan

    user@qfx> show vlans
    
    Routing instance        VLAN name             Tag          Interfaces
    default-switch          test-vlan                    100
                                                               ae100.100*
                                                               ae7.100*
    
    user@qfx> show configuration vlans test-vlan
    vlan-id 100;
    interface xe-0/0/8.100;
    l3-interface irb.100;
    
    

     

    If this solves your problem, please mark this post as "Accepted Solution."



  • 4.  RE: IRB interfaces and physical interface associated

    Posted 07-02-2020 03:21

    correct i already did this before opening the question here:

    I have

    user@qfx> show configuration vlans test
    vlan-id 4;
    l3-interface irb.4;
    
    and
    
    
    user@qfx> show vlans test
    
    Routing instance        VLAN name             Tag          Interfaces
    default-switch          test              4
                                                               ae0.0*
                                                               
    
    user@qfx> show configuration interfaces ae0 | display set
    (....)
    set interfaces ae0 unit 0 family ethernet-switching vlan members 3-4
    (....)
    

    but i was wondering about one step: having more interfaces where this vlans need to be allowed only for layer 2 than in the above output i can not differentiate in whcih interfaces is Layer 2 o3  but i think what i am writing here does not make sense.

    I shoud threat this topic as SVI in cisco world i would say, right?



  • 5.  RE: IRB interfaces and physical interface associated
    Best Answer

     
    Posted 07-02-2020 03:32

    You will need to consistently use vlan membership and not direct application of vlan tag number for this to fully work.

     

    Add the irb as the layer 3 interface to the vlan stanza

     

    and add the vlan name, not tag numbers to the interfaces.

     



  • 6.  RE: IRB interfaces and physical interface associated

     
    Posted 07-02-2020 03:12

    The operational command will give all the members of of all vlans

    show vlans

     

    You can also specify the name of any configured vlan

    show vlans Guest

     

    And the ? mark will list all your options

    show vlans ?