Switching

Expand all | Collapse all

Non-routable vlan and irb interface ?

Jump to Best Answer
  • 1.  Non-routable vlan and irb interface ?

    Posted 05-25-2019 15:17

    We have a stack of EX4600s that act as the core of our network. All routing is done through these switches. All edge switches (EX4200s) just do layer 2. I have two non-routable vlans, one for storage and one for vMotion. Below is a shortened list of vlan definitions and as you can see there is no layer 3 interface for vlan 126 or 127. There is an irb defined for these two though. Can I just delete the irb for these two since they appear not to be used? A vlan for just storage traffic and a vlan for vMotion are never routable per best practice.

     

        irb {

            unit 0 {

                family inet;

            }

            unit 48 {

                family inet {

                    address 10.121.48.1/22;

                }

            }       

            unit 126 {

                family inet {

                    address 10.121.126.1/24;

                }

            }

            unit 127 {

                family inet {

                    address 10.121.127.1/24;

                }

            }

        }

     

    vlans {

        BG_MN {

            description "Bus Garage & Maintenance Wired";

            vlan-id 48;

            l3-interface irb.48;

        }

        Storage {

            description Storage;

            vlan-id 126;

        }

        default {

            vlan-id 1;

        }

        vMotion {

            description vMotion;

            vlan-id 127;

        }

    }

     

     



  • 2.  RE: Non-routable vlan and irb interface ?
    Best Answer

     
    Posted 05-25-2019 18:36

    Yes—if you never need to route traffic to or from these subnets then you don’t need an irb interface or its layer 3 address. The vlan simply becomes a bucket for connected hosts to talk directly to each other.