I have three Data Center each is equiped with two GSS. Only one Data Center will be active at one time and will be switched over to second Data Center while the application server is not responding. Simialary it will switched to third Data Center while the applicaiton of first and second Data Center is not responding. Ordered List balance method would be used for this purpose or some one else?
How the GSS communicates with SLB; would it need extra configuration?
Yes Using ordered list you can achieve your desired results.
Each GSS independently probes the VIPs configured on local SLB devices. GSS can use
simple probes (like icmp, TCP, HTTP HEAD) to check the availability of the apps or can use Advance probes (KAL-AP /SNMP) to check the load along with the avialability. KAL-AP is the optimal method that works with the cisco SLB devices (CSS/CSM/ACE).It can check status of all VIPs configured on Cisco local SLB with a single query. SNMP probe is useful in case of non-cisco SLBs.
In case of KAL-AP you need some config changes on local SLB devices. For simple probes you dont need any special config on SLB devices (Apart from allowing the probe traffic).
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