First of all it should not happen. Although each GSS is probing VIP by itself for both GSSs VIP's status should be either up/down.
If for any reason connectivity between one GSS & VIP is down then GSS will start resolving VIP of a different data center so your application is still up.
GSSs for client requests are selected by the DNS servers authoritative for your domain.Its normally done on roundrobin based (default- but can be changed).
Lets assume we have two datacenters DC1 & DC2 with two vips for the same app VIP1 & VIP2 and similarly two GSSs Gss1 & Gss2.
A request from Client A's DNS server will hit the DNS server authoritative for abc.com. Lets say DNS server selects gss1 for this request if gss1 sees both VIPs up (and lb method on GSS is configured as ordered list , gss1 will always server address of VIP1 unless its down). Client A will hit VIP1 in DC1.
Now lets say another client, client B's DNS server asks (abc.com)'s DNS server for http://www.abc.com , this time DNS server will redirect thid request to gss2. If for some reason for gss2 VIP1 is down then gss2 will ask client B's Dns server to go to VIP2 in DC2.
What do you mean by requests hiting GSS1 not being entertained? Does it mean that there will be two different answers to the DNS requests: one when the client request hits the GSS1 (which will be the second answer in the ordered list has the probe for the first answer is failing) and another when the client hits the GSS2 (which will be the first answer in the ordered list has its probe is successfull).
VMware Trunk Port Group is supported from ACI version 2.1
VMM integration must be configured properly
ASA device package must be uploaded to APIC
ASAv version must be compatible with ACI and device package version
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