ExtremeSwitching (EOS)

  • 1.  conf vrrp vlan VLAN-Name add backup vrid

    Posted 05-17-2016 21:02
    Surprisingly I could not find any explanation anywhere in Extreme documentation about the below configuration line;

    conf vrrp vlan VLAN-Name add backup vrid

    --------------------
    I know the backup keyword is being used to define vrrp when we have two physical or VLAN IP addresses (one on each switch) and different VIP. or in other words when we are not using the VLAN IP on one of the switches as VIP (means no vrrp priority 255). Priority 255 is the default for vrrp configuration with keyword master.

    --------------------

    I need advice if the below configuraration has any problem or what exactly the purpose of keyword backup here if my above explanation is not true?

    My switches configuration: Both switches have unique IP addresses for VLAN1 from the same IP subnet.

    Switch-1

    configure vrrp vlan "VLAN1" add backup vrid 1 10.136.225.177
    configure vrrp vlan "VLAN1" vrid 1 advertisement-interval 1
    configure vrrp vlan "VLAN1" vrid 1 priority 100
    configure vrrp vlan "VLAN1" vrid 1 preempt
    configure vrrp add vlan "VLAN1"
    enable vrrp

    Switch-2

    configure vrrp vlan "VLAN1" add backup vrid 1 10.136.225.177
    configure vrrp vlan "VLAN1" vrid 1 advertisement-interval 1
    configure vrrp vlan "VLAN1" vrid 1 priority 60
    configure vrrp vlan "VLAN1" vrid 1 dont-preempt
    configure vrrp add vlan "VLAN1"
    enable vrrp

    --------------------------------------------------------

    What is the difference between the above and below config.

    configure vrrp vlan "VLAN1" vrid 1 priority 100
    configure vrrp vlan "VLAN1" vrid 1 add 10.136.225.177
    enable vrrp

    We have 50-60 pairs of switches where similar configuration (as above Switch-1 &2) is running fine since many years and only one pair is giving problems where vrrp is master-master on both switches. Our support team is rejecting the above configuration stating that there is no definition of keyword backup in extreme manuals so they will not work on it for resolution.

    Thanks

    Harkanwaljeet Singh



  • 2.  RE: conf vrrp vlan VLAN-Name add backup vrid

    Posted 05-18-2016 03:49
    I remember old 'ExtremeWare' supported 'master' and 'backup' keywords in VRRP configuration.
    If your switch runs ExtremeWare, you can visit the below link and find 'ExtremeWare' user guides / command references. ExtremeWare is currently end of support. The current 'ExtremeXOS' doesn't have 'master' and 'backup' keywords.

    http://www.extremenetworks.com/support/documentation-archives/


  • 3.  RE: conf vrrp vlan VLAN-Name add backup vrid

    Posted 05-18-2016 03:49
    Thanks Kevin. Yes we have summit400-48t and 48si switches which are running since long and due to EoS, these are slowly getting replaced with new hardware.


  • 4.  RE: conf vrrp vlan VLAN-Name add backup vrid

    Posted 05-18-2016 11:21
    When you configure VRRP for ExtremeWare you have to choose between master and backup roles.

    If you choose master role then the priority will be 255 and that instance will be always preferred regardless of priority or preempt configuration.

    However, if you want break this rule, you can choose both VRRP devices as backup role and the priority + preempt configuration will be considered to make the instance active.


  • 5.  RE: conf vrrp vlan VLAN-Name add backup vrid

    Posted 05-18-2016 11:21
    I'd strongly recommend against using priority 255 because it requires that the IP address of the VRRP master be "owned" by the VLAN.
    You lose the ability to have a truly "virtual" IP address when doing this.


  • 6.  RE: conf vrrp vlan VLAN-Name add backup vrid

    Posted 05-18-2016 11:21
    Thanks for your comments Henrique and Drew.