Ethernet Switching
Ethernet Switching

Non-routable vlan and irb interface ?

‎05-25-2019 03:16 PM

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;

    }

}

 

 

1 REPLY 1
Ethernet Switching
Solution
Accepted by topic author HendersonD
‎05-28-2019 03:47 AM

Re: Non-routable vlan and irb interface ?

[ Edited ]
‎05-25-2019 06:36 PM

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.