Cisco ISE & 802.1X NAC — Independent Consulting & Support

Network Access Control is one of the most complex areas of enterprise security — and one of the most frequently misimplemented. Cisco ISE projects fail not because of the technology, but because of what surrounds it: Active Directory structure, PKI design, certificate lifecycle, VLAN architecture, and endpoint posture policies that have to survive real users, real devices, and real helpdesk pressure.

With 11+ years of hands-on experience deploying and operating Cisco ISE in banking, manufacturing, and enterprise environments, I provide independent consulting, deployment support, and ongoing managed services for organizations that need ISE expertise without hiring a full-time specialist.

💬 Free technical consultation: WhatsApp or Email

What I Do

🔐 Cisco ISE Deployment & Configuration

• Greenfield ISE deployments — architecture design, node sizing, HA configuration
• Policy Service Node (PSN), Administration Node (PAN), Monitoring Node (MnT) setup
• Authentication policies — MAB, dot1x, WebAuth
• Authorization policies — VLAN assignment, dACL, Security Group Tags (SGT)
• Guest lifecycle management — sponsored, self-registration, hotspot portals
• BYOD onboarding — device registration, certificate provisioning
• Profiling — device classification, endpoint visibility
• Integration with Active Directory, LDAP, PKI

📶 802.1X Project Consulting

802.1X success depends on much more than network configuration. I help organizations navigate the full stack:

• AD & GPO preparation — machine authentication, certificate auto-enrollment
• PKI design — internal CA, certificate templates, SCEP/EST for BYOD
• Switch configuration — Cisco Catalyst, Aruba, HP — dot1x port config, MAB fallback
• Wireless integration — WPA3-Enterprise, EAP-TLS, PEAP-MSCHAPv2
• Monitor mode → Low-impact → Closed mode — phased rollout planning
• Troubleshooting — RADIUS debug, ISE live logs, switch port diagnostics

⚙️ Cisco ISE Upgrade & Migration

• ISE version upgrade planning and execution (2.x → 3.x → 3.3)
• Zero-downtime upgrade strategy for HA deployments
• Pre-upgrade health checks and post-upgrade validation
• Migration from legacy NAC solutions (Bradford, Aruba ClearPass → ISE)

🛡️ Ongoing ISE Management

• Policy review and optimization — removing unused rules, cleaning up authorization profiles
• Certificate lifecycle management — monitoring expiry, renewal automation
• New endpoint type onboarding — IoT devices, printers, cameras
• ISE patching and hotfix application
• Monthly health reports

Why 802.1X Projects Fail — And How I Help

Most 802.1X deployments struggle not with ISE itself, but with the surrounding infrastructure:

Common failure points:

• AD not structured for machine authentication — GPO not pushing certificates
• PKI misconfigured — certificates not auto-enrolling on endpoints
• Switch ports not consistently configured — MAB fallback missing
• Legacy devices with no 802.1X support — no exception handling strategy
• Rollout too aggressive — users locked out, helpdesk overwhelmed

My approach: I work through all of these systematically before touching ISE policy. The network part comes last — not first.

Field Experience

• Vakıfbank — full ISE deployment for 15,000+ users across dual data centers, integrated with AD, PKI, and Cisco DNA Center
• Cisco DNA Center SD-Access — ISE as the policy engine for fabric-wide 802.1X, SGT-based segmentation across Turkey and Egypt — published as a Cisco Success Story
• Global packaging manufacturer — multi-site 802.1X rollout with Cisco ISE, AnyConnect, and Catalyst 9000 across factory environments
• Multiple enterprise environments — phased dot1x deployments from monitor mode to closed mode, zero user-impact cutover

Independent Consulting — No Vendor Bias

I am not tied to any vendor. I recommend what works for your environment — whether that is Cisco ISE, Aruba ClearPass, or a hybrid approach.

If you already have ISE and need help with a specific problem — a failed upgrade, a certificate issue, a policy that is not working — I can engage for focused troubleshooting without a long-term commitment.

Service Models

Project-Based

• 802.1X architecture design and deployment: from €1,500
• ISE upgrade (per node): from €500
• Focused troubleshooting engagement: from €300
• Policy audit and cleanup: from €500

Managed Services (Monthly)

• ISE monitoring, certificate management, policy updates: from €150/month

Remote-First Delivery

All services are delivered remotely via secure access. No on-site visits required for most engagements. For new deployments requiring physical switch configuration, I coordinate with your local team.

Get in Touch

📱 WhatsApp: wa.me/4916098665971

📧 Email: info@barashhelvadzhaoglu.com

Free 30-minute technical consultation. No commitment required.