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How deploy GSLB with 4 ISPs scenarios.


Bilal Bou Hadir

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  1. How will be the GSLB between the 2 sites with consideration of having 4 IPs per service and the requirement is to have ISP1 as active and if it down, ISP 2 become active and if it down, failover to DR and use ISP3 as active and if HQ site came up, failback again to HQ and use ISP1 as active.
  2. How we can use the internet and the direct connection (DCI) between the two sites in the MEP traffic, so that the failover from HQ to DR will not happen until both the internet reachability and the DCI connection are down.
  3. Is it better to reconfigure the DMZ Netscalers to use only one Data VLAN (with one subnet) or keep the exiting setup with multiple VLANs and subnet IPs (with respective for the GSLB)? 

Notes:

Note that:

  1. The four ISP are active and every ISP have its public IPs range, which means every service or application will have 4 public IPs.
  2. The current configuration on DMZ’s Netscalers is using multiple VLANs 
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  • 2 weeks later...

How will be the GSLB between the 2 sites with consideration of having 4 IPs per service and the requirement is to have ISP1 as active and if it down, ISP 2 become active and if it down, failover to DR and use ISP3 as active and if HQ site came up, failback again to HQ and use ISP1 as active.

>>On HQ site NetScalers, how many LB vservers are configured, are there one for each ISP ? If yes, then two gslb services can be configured for each of the ISPs lb. For failover from ISP1 to ISP2 within HQ and failvoer from HQ to DR both can be achieved using priority order gslb. Please refer the link https://docs.netscaler.com/en-us/citrix-adc/current-release/global-server-load-balancing/gslb-priority-order-services.html

How we can use the internet and the direct connection (DCI) between the two sites in the MEP traffic, so that the failover from HQ to DR will not happen until both the internet reachability and the DCI connection are down.

>>Why is the need for DCI connection to be down for failover? As application will be accessible through one of the ISPs even if the DCI connection is down.

Is it better to reconfigure the DMZ Netscalers to use only one Data VLAN (with one subnet) or keep the exiting setup with multiple VLANs and subnet IPs (with respective for the GSLB)? 

>>From GSLB perspective it will not matter, based on the network topology requirement it should be decided.

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