DataPower

Expand all | Collapse all

Conditions for stanby control

  • 1.  Conditions for stanby control

    Posted 12 days ago
    A customer just asked me the following question: What are the conditions which IP addresses must meet to be able to be used in a common standby group? Do they have to belong to a common LAN or VLAN? Which layer of the OSI model (2 or 3) is necessary?
    Can you please help me?

    ------------------------------
    Patrick Marie
    ------------------------------


  • 2.  RE: Conditions for stanby control

    Posted 12 days ago
    The DP standby-control extends Hot Standby Routing Protocol(HSRP) which has a dependency on multicast address 224.0. 0.2.  All members of the DP front side cluster must be able to send/receive HSRP to/from each other.

    The self-balance, which you did not ask about and I include for completeness, has separate requirements.  All transactions enter the cluster through the "active" leader.  The active leader responds to arp requests, and send gratuitous arp for, for the VIP address.  The leader uses linux ip_vs to forward packets from the "active" cluster leader to the cluster members.  The cluster members send responses back to the requester directly from the cluster member, not routed back through active leader, using VIP source IP. 

    Hope this help, will watch for followup questions.

    ------------------------------
    Ivan Heninger
    ------------------------------



  • 3.  RE: Conditions for stanby control

    Posted 7 days ago
    Thanks for your detailed answer!

    ------------------------------
    Patrick Marie
    ------------------------------