Ping Labz (Page 7)

C9800 RADIUS Authentication Failures: Troubleshooting Guide

Shared secret mismatches, EAP timeouts, and policy bugs make RADIUS authentication the top cause of wireless login failures. A Cisco C9800 RADIUS troubleshooting guide with the exact show and debug commands to isolate each failure type.

12 min read Apr 5, 2026

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C9800 Client Connectivity Troubleshooting: Common Issues and Fixes

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Wireless clients fail to associate, authenticate, get an IP, or roam cleanly, each pointing to a different part of the client lifecycle. A methodical C9800 client connectivity troubleshooting guide with tools and fixes.

8 min read Apr 5, 2026

Wireless public

C9800 AP Not Joining: Troubleshooting the AP Join Process

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AP join failures on the Cisco C9800 come from discovery, CAPWAP, certificates, or DTLS, each with different fixes. A methodical guide to troubleshooting the AP join process so you can fix most issues in minutes.

8 min read Apr 5, 2026

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C9800 Multicast and mDNS Gateway Configuration

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Multicast over Wi-Fi is very different from wired. AirPlay, printer discovery, and mDNS all depend on it, and without the right C9800 configuration they break or chew airtime. A practical multicast and mDNS gateway guide.

11 min read Apr 5, 2026

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C9800 N+1 Redundancy Configuration and Best Practices

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N+1 redundancy gives Cisco C9800 deployments cost-effective high availability without the full SSO stack, accepting a few seconds of reconnection in exchange for real savings. Configuration and best practices for sites that can tolerate it.

10 min read Apr 5, 2026

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C9800 High Availability (SSO) Configuration Guide

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SSO on the Cisco Catalyst 9800 provides subsecond failover and keeps active client sessions intact. A complete configuration guide covering topology, physical connections, CLI setup, and verification for production wireless HA.

11 min read Apr 5, 2026

Wireless public

C9800 QoS Configuration: Auto QoS, DSCP Mapping, and Wireless Profiles

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Without proper QoS, wireless becomes best-effort and business traffic suffers. A Cisco C9800 QoS guide covering 802.11e, DSCP mapping, Auto QoS profiles, and wireless policies for voice, video, and critical apps.

11 min read Apr 5, 2026

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C9800 Web Authentication and Captive Portal Configuration

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Web authentication and captive portals on the C9800 support guest, BYOD, and multi-tier access. A configuration guide covering local, central, and external web auth methods with certificate and portal design tips.

11 min read Apr 5, 2026

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How to Configure 802.1X and WPA3 Enterprise on the Cisco C9800

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802.1X plus WPA3 Enterprise gives you mutual authentication, granular access, and protection against modern wireless attacks. A step-by-step Cisco Catalyst 9800 configuration guide for secure enterprise wireless.

10 min read Apr 5, 2026

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C9800 RADIUS and AAA Configuration Guide

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AAA is the foundation of enterprise wireless security. A Cisco Catalyst 9800 RADIUS and AAA configuration guide covering method lists, authentication, accounting, and server groups for scalable wireless policy.

14 min read Apr 5, 2026

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C9800 FlexConnect Configuration: Deployment, Switching, and ACLs

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FlexConnect pushes intelligence to the edge of your network, giving remote APs autonomy and cutting WAN dependency. A Cisco C9800 FlexConnect configuration guide covering local switching, ACLs, and survivability.

8 min read Apr 5, 2026

Wireless public

How to Configure WLANs on the Cisco Catalyst 9800

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Moving from AireOS to the Cisco Catalyst 9800 means learning a profile-and-tag WLAN model that trips up even experienced wireless engineers. A practical guide to WLAN configuration on the C9800 with GUI and CLI examples.

10 min read Apr 5, 2026