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Cisco ACI vs Illumio Segmentation comparison

 

Comparison Buyer's Guide

Executive SummaryUpdated on Jun 3, 2026

Review summaries and opinions

We asked business professionals to review the solutions they use. Here are some excerpts of what they said:
 

ROI

Sentiment score
5.9
Cisco ACI enhances efficiency, reduces costs, and boosts security, with varied results due to tool utilization differences.
Sentiment score
5.6
Illumio Segmentation offers cost-effective, time-efficient security, eliminating extra costs and delivering high ROI with significant savings.
Efficient utilization leads to cost savings and efficiency gains.
Sr Consultant at Tata Consultancy
I observe extensive return on investment with Illumio.
Senior Security Consultant at Orange Cyberdefense
Illumio serves as a single endpoint technology where I can implement various features, including a zero-trust network, north-to-south and east-to-west configurations, and micro-segmentation, all coming from one platform, which ultimately saves us time and money.
Security Professional at a tech vendor with 10,001+ employees
Illumio definitely demonstrates its value in money-saving capabilities, enhancing our lateral environment inside the organization and providing effectiveness overall once integrated.
Security delivery specialist at a tech vendor with 10,001+ employees
 

Customer Service

Sentiment score
7.2
Cisco ACI support is widely praised for its responsiveness and expertise, despite occasional delays and varying engineer experience.
Sentiment score
4.4
Illumio Segmentation's customer service is reviewed as both responsive and lacking, with praise for availability but issues with delays.
The technical support from Cisco is satisfactory.
Sr Consultant at Tata Consultancy
When issues occur, the TAC is not able to provide much support, leading to difficulties in finding RCAs.
Network Technical Manager at KPMG
Cisco has a Customer Experience team and other professional services coming in, so their support seems to be good.
Consulting & Solution Integration at a comms service provider with 10,001+ employees
Whenever I raise a case with their support team, regardless of the priority level—P1, P2, P3, or P4—they generally reply within an hour
Security Professional at a tech vendor with 10,001+ employees
Even if we raise an issue on non-working days like Saturdays or Sundays, we receive prompt responses.
IT Specialist at Allianz
The customer support is very prominent.
Security delivery specialist at a tech vendor with 10,001+ employees
 

Scalability Issues

Sentiment score
7.7
Cisco ACI offers scalable solutions for enterprises, facilitating efficient expansion and adaptability in diverse infrastructures and data center needs.
Sentiment score
6.5
Illumio Segmentation is praised for its scalability, effectively managing large installations and seamless integration into cloud and container environments.
The solution offers high performance and scalability with connectivity options up to 100 GS.
Chief Technology Officer at Mehbub General Trading PLC
The scalability of Cisco ACI supports our organization's growth effectively.
Sr Consultant at Tata Consultancy
Expanding your network or your data center with Cisco ACI is not an issue; scalability is a good feature.
Network Technical Manager at KPMG
Scaling it to a large level is not an issue for us.
Cyber Security Architect at a tech vendor with 10,001+ employees
By employing Linux scripting or other methods, I can push the policy to all devices at once, making it easy to scale.
Security Professional at a tech vendor with 10,001+ employees
Illumio's scalability is very good; it is quite easy to scale.
Cybersecurity Engineer at a tech vendor with 10,001+ employees
 

Stability Issues

Sentiment score
7.5
Cisco ACI shows improved stability and high reliability, with user satisfaction ratings between eight and ten for large environments.
Sentiment score
8.0
Illumio Segmentation is rated highly for stability, being reliable with no bugs, though some are still fine-tuning it.
For stability, Cisco ACI rates a nine or 9.5 because I've seen three customers using Cisco ACI and once deployed, the solution is very stable.
Network Technical Manager at KPMG
Cisco ACI is stable in my experience.
Senior Network Automation Engineer at a outsourcing company with 1,001-5,000 employees
Illumio is a stable solution with no glitches or bugs reported, making it a reliable product for us.
IT Specialist at Allianz
 

Room For Improvement

Cisco ACI needs user-friendly GUI, cloud integration, documentation, unified CLI, bug fixes, security enhancements, and Cisco product integration.
Illumio Segmentation needs improvements in user support, tool integration, scalability, GUI, log analysis, and data security enhancements.
What we need is something called RAG, or retrieval-augmented generation. If Cisco can implement that to utilize customer-specific data instead of general knowledge, while ensuring data privacy under GDPR laws, I think that will result in very good, reliable output.
Senior Network Automation Engineer at a outsourcing company with 1,001-5,000 employees
Their lack of on-ground offices can result in business losses.
Chief Technology Officer at Mehbub General Trading PLC
We do not make use of its visibility and analytics features, as we are mostly using it for the networking part only.
S VP, IT Infra at ATOM
They need to install an agent in the container world, while Akamai Guardicore does not need to install an agent, so they have native support that Illumio lacks.
Senior Security Consultant at Orange Cyberdefense
There could also be more examples of how the automations can be done using Illumio.
Cyber Security Architect at a tech vendor with 10,001+ employees
Another improvement might be around scalability, ensuring that as organizations grow, Illumio can handle even larger, more complex environments seamlessly.
DevOps at a marketing services firm with 51-200 employees
 

Setup Cost

Cisco ACI has high pricing influenced by site count and components, suited for large enterprises rather than SMBs.
Illumio Segmentation offers flexible, competitive pricing tied to workloads, often seen as cost-effective compared to alternatives.
In general, Cisco ACI is on the higher side; it's not a cheap solution.
Network Technical Manager at KPMG
Cisco's pricing tends to be on the higher end compared to other vendors.
Chief Technology Officer at Mehbub General Trading PLC
Cost is one thing that could be improved, as it is heavy for an emerging market like ours.
S VP, IT Infra at ATOM
I know that Illumio is the cheapest solution in the security area.
IT Specialist at Allianz
But when you compare it to firewalls, then it may not be that expensive.
Senior Security Consultant at Orange Cyberdefense
I think it's not very expensive if we compare it with Guardicore.
Cyber Security Architect at a tech vendor with 10,001+ employees
 

Valuable Features

Cisco ACI offers centralized management, scalability, automation, ease of use, and seamless integration for enhanced security and performance.
Illumio Segmentation enhances security with flexible visibility, easy policy management, real-time monitoring, and zero-trust architecture for threat containment.
Cisco ACI provides substantial capability; you can design your network accordingly and it's part of the SDN family, providing many benefits to the organization, especially when moving from traditional network infrastructure.
Network Technical Manager at KPMG
Instead of taking days or multiple days for a deployment of a server or application, they can do it immediately within minutes because all the configuration templates are already there in the control plane.
Consulting & Solution Integration at a comms service provider with 10,001+ employees
With the Cisco ACI fabric, you manage them as a whole, and it's an automation-driven solution, with our network development team integrating with the APIs to establish workflows for observability, fault alerts, monitoring, and more.
Senior Network Automation Engineer at a outsourcing company with 1,001-5,000 employees
Illumio helps in audit purposes by saving data and showing blocked traffic, ensuring no outside traffic is allowed.
IT Specialist at Allianz
The most important feature is the traffic review analysis, where we use the draft view and the reported view that helps us understand how the application interacts with other applications in the environment, and based on that, we are able to define the policies.
Cyber Security Architect at a tech vendor with 10,001+ employees
Illumio is a powerful tool for micro-segmentation and zero trust security that provides strong visibility, flexible policy management, and effective threat containment, enhancing an organization's internal security posture.
Cybersecurity Engineer at a tech vendor with 10,001+ employees
 

Categories and Ranking

Cisco ACI
Ranking in Cloud and Data Center Security
9th
Average Rating
8.0
Reviews Sentiment
6.1
Number of Reviews
105
Ranking in other categories
Network Virtualization (2nd), Software Defined Networking (SDN) (2nd)
Illumio Segmentation
Ranking in Cloud and Data Center Security
4th
Average Rating
8.4
Reviews Sentiment
5.7
Number of Reviews
18
Ranking in other categories
Cloud Workload Protection Platforms (CWPP) (11th), Microsegmentation Software (1st)
 

Mindshare comparison

As of August 2026, in the Cloud and Data Center Security category, the mindshare of Cisco ACI is 3.7%, down from 5.2% compared to the previous year. The mindshare of Illumio Segmentation is 14.0%, down from 24.5% compared to the previous year. It is calculated based on PeerSpot user engagement data.
Cloud and Data Center Security Mindshare Distribution
ProductMindshare (%)
Illumio Segmentation14.0%
Cisco ACI3.7%
Other82.3%
Cloud and Data Center Security
 

Featured Reviews

Sulaiman Olubiyi - PeerSpot reviewer
Senior Network Automation Engineer at a outsourcing company with 1,001-5,000 employees
Network automation has simplified secure multi-site connectivity and reduced daily operational effort
I believe Cisco ACI could improve by incorporating something related to agentic AI, where it can execute tasks based on particular evaluations or loop engineering, enhancing fault identification or suggestions based on each tenant's configuration. Additionally, I think they should ensure that the documentation is comprehensive. I appreciate that Cisco provides documentation, and their support engineers are helpful in case of any issues. In terms of governance and security regarding Cisco ACI's AI capabilities, I think what we call evals or evaluations is important, whereby the engineer can evaluate the functionalities of the AI in Cisco ACI, preventing it from making deletions or modifications on its own. Therefore, there should be evaluations or guardrails incorporated into the development capabilities. Regarding accuracy and reliability of output for Cisco ACI's AI capabilities, it hasn't met my expectations. What we need is something called RAG, or retrieval-augmented generation. If Cisco can implement that to utilize customer-specific data instead of general knowledge, while ensuring data privacy under GDPR laws, I think that will result in very good, reliable output.
Irfan Sharfi - PeerSpot reviewer
Security Professional at a tech vendor with 10,001+ employees
Micro-segmentation has transformed endpoint protection and now isolates internal threats effectively
Illumio can be improved in several areas based on our feedback. Sometimes, the PCE experiences slowness, especially when deploying around 300,000 endpoint devices. When these devices communicate within the network, loading the map or connections can cause latency, which needs improvement for a more user-friendly and faster experience. Regarding improvements to the interface, I believe we can add more features to the graphical user interface, such as proper logs. While the logs currently indicate what was blocked or allowed, clicking on a specific log should provide more information, such as which extra-scope rule is causing a denial, offering better analysis for troubleshooting.
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Top Industries

By visitors reading reviews
Financial Services Firm
14%
Manufacturing Company
9%
Construction Company
8%
Outsourcing Company
7%
Financial Services Firm
17%
Computer Software Company
9%
Manufacturing Company
8%
Government
6%
 

Company Size

By reviewers
Large Enterprise
Midsize Enterprise
Small Business
By reviewers
Company SizeCount
Small Business21
Midsize Enterprise19
Large Enterprise89
By reviewers
Company SizeCount
Small Business5
Midsize Enterprise1
Large Enterprise13
 

Questions from the Community

What are the biggest differences between Cisco ACI and VMware NSX?
There are some very major differences between both the Products and to name a few. -Cisco ACI have physical network gear (9K Switches) where the Code runs in ACI Policy Mode & the UCS server wh...
What are the biggest differences between Cisco ACI and VMware NSX?
Once you know your way around the Cisco ecosystem, using Cisco ACI is not so difficult. It is a global product, so when you change one interface, changes are automatically reflected on every switch...
What is your experience regarding pricing and costs for Cisco ACI?
Cost is one thing that could be improved, as it is heavy for an emerging market like ours.
What is your experience regarding pricing and costs for Illumio Adaptive Security Platform?
It will be the same price as the Akamai price for Guardicore. It's expensive, that's true. But when you compare it to firewalls, then it may not be that expensive.
What needs improvement with Illumio Adaptive Security Platform?
I would appreciate if Illumio Segmentation's interface were better. It is good enough to manage the operation and get the visibility, but when looking for data regarding licenses and expansion mana...
What is your primary use case for Illumio Adaptive Security Platform?
My main use case for Illumio Segmentation is security and visibility, as I am able to get a lot of visibility in networking, even in sites I don't know about, and it is a strong security solution. ...
 

Also Known As

No data available
Illumio Adaptive Security Platform, Illumio ASP
 

Overview

 

Sample Customers

Bowling Green State University, du, Qatar University
Plantronics, NTT Innovation Institute Inc.
Find out what your peers are saying about Cisco ACI vs. Illumio Segmentation and other solutions. Updated: June 2026.
908,800 professionals have used our research since 2012.