ExtremeSwitching (EOS)

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netscaler/citrix server send gratuitous arp which is not recordnised by S8 Core Switch

  • 1.  netscaler/citrix server send gratuitous arp which is not recordnised by S8 Core Switch

    Posted 05-02-2017 08:44
    Our Customer is using a netscaler. Server (main&backup) is using same IP Address.

    When there is an failover on server site, the server sends a gartuitous arp message.
    The core switch (S8) does not recordnise this massage, so it too the default value of apr/mac timeout of 300sec the S8 will recordnise the MAC of the server which is now activ after failover.

    is there any chance to get the gartuitous arp message tracked by the core without changing the arp/mac timeout?

    many thanks!


  • 2.  RE: netscaler/citrix server send gratuitous arp which is not recordnised by S8 Core Switch

    Posted 05-02-2017 09:15
    hello,
    did you test with enabled gratuitous-arp-learning.

    interface vlan.0.1010
    ip address 192.168.10.2 255.255.255.0 primary
    ip gratuitous-arp-learning both
    no shutdown
    exit

    S8(su-config-intf-vlan.0.1010)->ip gratuitous-arp?
    gratuitous-arp Enable updating existing arp binding from gratuitous-arp
    gratuitous-arp-learning Enable learning new arp binding from gratuitous-arp

    regards
    Bastian
    -



  • 3.  RE: netscaler/citrix server send gratuitous arp which is not recordnised by S8 Core Switch

    Posted 05-02-2017 11:32
    Hi Bastian,

    does that have an impact on traffic/cpu performance?

    Thanks
    Regards
    Nico



  • 4.  RE: netscaler/citrix server send gratuitous arp which is not recordnised by S8 Core Switch

    Posted 05-02-2017 11:40
    no impact, just processing the gratuitous-arp packets and update the IP/MAC info as requested.
    Bastian
    -


  • 5.  RE: netscaler/citrix server send gratuitous arp which is not recordnised by S8 Core Switch

    Posted 05-02-2017 11:42
    Thanks a lot for your quick help here!