Junos OS

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multihoming w/o VRRP - using the same mac on two devices

  • 1.  multihoming w/o VRRP - using the same mac on two devices

    Posted 06-17-2021 03:53
    Hello,



    we have 2x QFX10002-36Q running JunOS 20.2R2-S3.5 and some /29 and /28 prefixes that don't want to lose ip addresses due to VRRP(virtual-gateway). So we tried the method with same mac address on both devices in the irb described here.


    Routing worked as expected, but both devices had a lot of log spam:
    "KERN_ARP_DUPLICATE_ADDR: duplicate IP address x.x.x.1! sent from address: 40:de:ad:60:00:05 (error count = 36092)"​



    Config on both devices:
    unit 7 {
        description voice;
        family inet {
            address 1.2.3.1/27;
        }
        mac 40:de:ad:60:00:05;
    }
    
    vlans {
        voice {
            vlan-id 7;
            l3-interface irb.7;
        }
    }​


    I could not find another solution without losing two IP addresses per prefix in addition to the gateway IP itself. Maybe there is another solution?


    Thank you for helping before hand!


    kind regards


  • 2.  RE: multihoming w/o VRRP - using the same mac on two devices

     
    Posted 06-17-2021 04:37
    I have never set up anycast without EVPN but according to Guideline 3 on the document you linked to, it appears you haven't used the correct configuration method for a non /30 or /31 subnet.