Hi!
1. Does ACI support sflow?
-> I know that NXOS is supported, but there is no document related to ACI.
ACI (Nexus in ACI-mode) does not natively support sFlow.
In NX-OS mode, however, you can leverage many non-proprietary features, including sFlow. And you can leverage NDI, for example, for more supported flow models.
2. Does ACI support netflow sampling?
-> I know that the EX model is not supported
We're testing with the FX model, but we can't find that menu.
ACI has certain limitations on Netflow sampling like the one you have probably seen in the document about EX.
We rarely make changes directly on ACI switches, which is a little against the purpose of SDN and ACI's policy-driven design.
On that note, if you are struggling with that configuration in particular, it might be a good idea to discuss it with BU.
3. Can't APIC collect Spine/Leaf's SNMP information at once?
Also, doesn't APIC support SNMP?
-> Individual SNMP polling of Spine/Leaf was confirmed.
-> SNMP polling of APIC does not work.
APIC supports SNMP, but it's limited to the APIC itself.
SNMP polling for Spine and Leaf switches needs to be done separately and directly on those devices.
If SNMP polling doesn't work on APIC, check if the required OOB contract, IP, filters, policies, and so forth are in place.
Refer to the documents as follows for prerequisites and steps in detail.
Configuring SNMP for ACI (Steps with Screenshots)
Configuring SNMP in APIC (Whitepaper)
Cheers!
Eric
