Please find my response below:
If Catalyst 9000 series switches used in designing LAN network can I form Single network fabric as ACI fabric.
-- With CAT 9k switches you can form a single fabric for campus network, solution is known as Cisco SD-Access. DNA controller provides you GUI based centralized management console which is analogous to APIC in ACI. Please note that ACI Forms your DC fabric and SD-Access forms your Campus Fabric and these are two different solutions based on completely different set of hardware and software.
However, the integration is possible between ACI and SD-Access with the help of trustsec(ISE) to provide end-to-end segmentation between campus and DC network.
Is DNA center is Must .Without DNA center can I configure Catalyst 9000 series switches for single fabric as SDN.
-- DNA Center is must if you want to deploy SD-Access. Product portfolio is designed that way. You can use CAT9K without DNA center as well in case it is being deployed in legacy network(Non SDN).
can I use APIC-EM ( I think it is Freeware )with catalyst 9000 switches to create SDN.
-- Well, original idea was to have DNA center app installed on top of APIC-EM platform to form SD-Access. However, due to limited resources that APIC-EM could offer to run overwhelming DNA center app, this idea was discarded. So, there is a separate DNA controller in hardware appliance form factor which is part of SD-Access solution to configure and manage your devices.
if catalyst 2900 switches was upgraded to DNA software subscription,will single network fabric can be formed as SDN.
-- CAT2900 switches lack ASICs required to run SD-Access(vxlan and stuffs). However, you can discover and manage your devices through DNA controller, but they can't be part of campus fabric.
Please refer below link which would help you in learning about SD-Access Solution:
1. Software-Defined Access Design Guide
2. Cisco Software-Defined Access Ebook
Also, for more queries on SD-Access, you can use SD-Access section of cisco community for quick turn around time with the response, below is the link:
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after 2 months I wouldn't recommend this solution in the production environment because:
- there is a problem with the functioning of EVPN on the Cat9300 platform in the configuration stack (in same part of switches work, and on same part not. Configuration is the same.) - software 16.09.01 seems to be unstable. I have a problem with hanging ports, ports with only PoE and even switch reboots. - Cisco support is none (Over a month ago I req Tac with EVPN and zero reaction from Cisco TAC - priority 2). I intend to escalate him very much after the holidays in my country because it is a mockery. I take it as a lack of Cisco support skills
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For Enterprise network, pls see the SD-Access, deployment guide with detailed information.
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