I came across a peculiar issue regarding a new NetScaler SDX 14020 setup in combination with a Cisco Nexus C9372-PX-E and C9336PQ infrastructure, a new buildup of the SDX/VPX with multiple HA instances spinning and a working environment. LA sets configured for HA probes and everything nice and easy separated through vlan access. Long story short, at first it looked like a bug regarding the combination of NetScaler and Cisco: https://support.citrix.com/article/CTX215720 and created an support case with the follow ups with it, afterwards it seemed that the untagged management vlan setup was overlapping from data channels and the root cause for this was at the Cisco ACI side of things, the EPG(EndpointGroup) and BridgeDomain were overlapping in that case. The solution was to create a new and dedicated EPG/BridgeDomain for the data channels of the NetScaler.
So lessons learned:
- Double check the setup of the ACI even if you get the “yes it’s correct” statement from your customer