2 Replies Latest reply on Nov 7, 2013 8:28 AM by levi

    VRRP / VLAN arp address

    drjarmon New Member

      End nodes ARP entries are flapping between the VRRP MAC address and the VLAN MAC address.  Each time there's a change, there's a network traffic spike.  Trying to understand why this anomaly is happening.

       

      Thanks

        • Re: VRRP / VLAN arp address
          jayh Hall_of_Fame

          It sounds like a misconfiguration.  The physical VLAN IP must be different on each VRRP device, and the VRRP IP the same on both, also the same group number on both. 

           

          Sample config:

           

          Router 1

           

          interface vlan 6

          ip address 10.0.0.2 255.255.255.0

            vrrp 6 ip 10.0.0.1

           

          Router 2

           

          interface vlan 6

            ip address 10.0.0.3 255.255.255.0

            vrrp 6 ip 10.0.0.1

           

          ARP for 10.0.0.2 will be that shown on router 1's VLAN interface.

          ARP for 10.0.0.3 will be that shown on router 2's VLAN interface.

          ARP for 10.0.0.1 will be 0000.5e00.0106 regardless of which is active.

           

          Last byte of VRRP address is the group number.

          • Re: VRRP / VLAN arp address
            levi Employee

            drjarmon:

             

            I went ahead and flagged the "Correct Answer" on this post to make it more visible and help other members of the community find solutions more easily. If you don't feel like the answer I marked was correct, feel free to come back to this post to unmark it and select another in its place with the applicable buttons.  If you have any additional information on this that others may benefit from, please come back to this post to provide an update.  If you still need assistance, we would be more than happy to continue working with you on this - just let us know in a reply.

             

            Thanks,

            Levi