Hi, I cannot answer question directly, but consider these as alternatives:
1) DNS appliance (multi-master), works well and has many nice options: http://www.infoblox.com. This is probably more suitable to running DNS than GSS. BTW, I don't/haven't worked for infoblox. I have deployed them in the past and think they work pretty well.
2) Do you really need GSS appliance in your environment? Before purchasing a GSS, consider this write-up discussing GSLB (first link may not work):
This document will provide screenshots to outline the steps to setup
TACACS+ configuration to ACI and also the configuration required on
Cisco ACS server. Please find the official Cisco guide for configuring
TACACS+ Authentication to ACI:
Is it supported or NOT supported? It's a frequently asked question.
Before APIC, release 2.3(1f), transit routing was not supported within a
single L3Out profile. In APIC, release 2.3(1f) and later, you can
configure transit routing with a single L3Out pr...
Cisco Documents are usually accurate, but when it came to the document
on Cisco APIC Signature-Based Transactions it was slightly off the mark.
This document is for those novices to API like me who cant seem to
figure out how to go about performing signat...