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Forum Discussion

SulemanTajik's avatar
SulemanTajik
Icon for Nimbostratus rankNimbostratus
Aug 19, 2015

Can we deploy GTM between 02 sites for automatic failover ?

We have 02 sites namely Primary and DR site. Primary site will be active for all traffic but we want our DR site to take over in case of outage/disaster of primary site. Do we need GTM in this scenario and please also briefly explain how the automatic failover will happen. ?

 

Regards,

 

Suleman

 

7 Replies

  • DushyantSingh_1's avatar
    DushyantSingh_1
    Icon for Nimbostratus rankNimbostratus
    Aug 19, 2015

    Hi, Could you explain your site locations and basic connectivity. Are these both site DCs?

     

  • SulemanTajik's avatar
    SulemanTajik
    Icon for Nimbostratus rankNimbostratus
    Aug 19, 2015

    Thanks Stanislas.

     

    Actually we are suggesting our customer to use GTM for automatic Site failover. i know GTM can load-balance intelligently among multiple sites but its not required in ours case for now as primary site will be always active and traffic will be diverted to DR site only when primary site is not available.

     

    What we want to make sure here is that, design wise and technically its recommended to use GTM for automatic failover and our solution is justified.

     

    thanks again.

     

    Suleman

     

  • Stanislas_Piro2's avatar
    Stanislas_Piro2
    Icon for Cumulonimbus rankCumulonimbus
    Aug 19, 2015

    there is no F5 recommendation to use load balancing instead of DR.

     

    F5 contains features to let administrators design GTM as needed. if the customer need is DR, use Global availability load balancing method, this method exist for this need.

     

  • SulemanTajik's avatar
    SulemanTajik
    Icon for Nimbostratus rankNimbostratus
    Aug 19, 2015

    Please find the diagram below: Now i want to ask that if the link between primary site and internet fails which mean the whole site is down. will the traffic be diverted to the DR site automatically? Does F5 GTM modules has this intelligence and support this function ?

     

    Note that our requirement is that all time Primary site will be active and DR will become active only if the Primary site is down/unavailable.

     

    Thanks, Suleman

     

     

  • Stanislas_Piro2's avatar
    Stanislas_Piro2
    Icon for Cumulonimbus rankCumulonimbus
    Aug 20, 2015

    Hi,

     

    The recommended deployment is:

     

    • GTM communication must be done by external IPs
    • both GTM must be configured as DNS server for every DNS zones
    • each wideIP load balancing method must be Global availability with primary site VS as first

    when a client DNS request one of GTM:

     

    • if GTM 1 is available and VS of primary site is available, DNS response will be with primary site VS
    • if GTM 1 is available and VS of primary site is unavailable, DNS response will be with DR site VS
    • if GTM 1 is unavailable and VS of primary site is available, DNS response will be with DR site VS
    • if GTM 1 is unavailable and VS of primary site is unavailable, DNS response will be with DR site VS

    You can configure link object to detect lose of Internet Link (useful if GTM communication is with internal IPs)