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implementing-network-access-control-with-cisco-ise

Configures Cisco ISE for 802.1X authentication, MAB, posture assessment, and dynamic VLAN assignment.

954|172|Updated Mar 13, 2026
Search Tags:#radius#802.1x#posture assessment#dynamic vlan#network access control#mab#cisco ise
One-click install
npx skills add https://github.com/xalgord/xalgorix --skill implementing-network-access-control-with-cisco-ise
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: implementing-network-access-control-with-cisco-ise
Source: https://github.com/xalgord/xalgorix/tree/main/internal/tools/skills/data/network-security/implementing-network-access-control-with-cisco-ise
Command: npx skills add https://github.com/xalgord/xalgorix --skill implementing-network-access-control-with-cisco-ise

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Deploying network access control with Cisco ISE involves complex coordination of RADIUS policies, switch 802.1X configuration, Active Directory integration, and posture enforcement, where misconfigurations can leave ports failing open or blocking legitimate users.

Core Features & Use Cases

  • 802.1X and MAB Deployment: Step-by-step switch and ISE configuration for wired authentication with EAP-TLS, PEAP, and MAC Authentication Bypass fallback for printers and phones.
  • Authorization Policy Design: Maps AD groups and posture compliance states to VLAN assignments, downloadable ACLs, and Security Group Tags for TrustSec segmentation.
  • Misconfiguration Detection: Identifies common failure modes like monitor mode left in production, MAB spoofing, multi-host vs multi-auth confusion, and missing CoA or critical VLAN fallback.
  • Use Case: A network engineer rolling out NAC across a campus uses this Skill to configure Catalyst switches, build ISE policy sets, verify authentication sessions, and test failure paths before enforcement.

Quick Start

Help me configure Cisco ISE with 802.1X authentication and MAB fallback on my Catalyst access switches with dynamic VLAN assignment.

Frequently Asked Questions about implementing-network-access-control-with-cisco-ise

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I configure 802.1X on Cisco switches with ISE?▼

Enable AAA with radius server groups pointing to ISE, activate dot1x system-auth-control, then apply authentication port-control auto with dot1x and mab on access ports. ISE evaluates RADIUS requests and returns VLAN, dACL, and SGT authorization attributes.

What is the difference between MAB and 802.1X authentication?▼

802.1X authenticates endpoints via EAP methods like EAP-TLS or PEAP using credentials or certificates, while MAB authenticates only by MAC address for devices without supplicants like printers. MAB is weaker and should be paired with ISE profiling.

Does Cisco ISE support Active Directory integration?▼

Yes, ISE joins the AD domain as a machine account under External Identity Sources and uses AD groups like Domain Users or IT-Admins in authorization policies. It supports both user and machine authentication against AD.

Why does my 802.1X port fail open when RADIUS is down?▼

Without an authentication event server dead action critical VLAN configured, a RADIUS outage either fails open or black-holes endpoints. Configure a critical VLAN and verify with show authentication sessions during a simulated server failure.

What are the limitations of MAC Authentication Bypass?▼

MAB trusts a spoofable MAC address, so cloning a printer's MAC grants an attacker that VLAN access. Mitigate by combining MAB with ISE profiling via DHCP, CDP, and LLDP, and alert on endpoint profile changes.

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