Also, note there is a 10ms channel change interval that occur. With the move to off channel for a period of 50ms every 16 seconds, the AP, by default, only spends a small percentage of its time to not serve clients. This operation is performed by Local and Flex-Connect (in connected mode) mode APs and utilizes a time-slicing technique which allows client service and channel scan with the usage of the same radio.
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Cisco Spectrum Expert can also be used to identify rogue devices not based on the 802.11 protocol, such as Bluetooth bridges. The Cisco UWN uses a number of methods to detect Wi-Fi-based rogue devices such as an off-channel scan and dedicated monitor mode capabilities. This includes rogue Access Points, wireless router, rogue clients, and rogue ad-hoc networks. Mitigation - Switch port shutting, rogue location, and rogue containment are used in to track down its physical location and to nullify the threat of the rogue device.Ī rogue is essentially any device that shares your spectrum, but is not in your control. Rogue classification rules also assist in the filtration of rogues into specific categories based on their characteristics. There are three main phases of rogue device management in the Cisco Unified Wireless Network (UWN) solution:ĭetection - A Radio Resource Management (RRM) scan is used to detect the presence of rogue devices.Ĭlassification - Rogue Location Discovery Protocol (RLDP), Rogue Detectors (Wave 1 APs only) and switch port traces are used to identify if the rogue device is connected to the wired network. Finally, it is critical to evaluate (or avoid altogether) rogue auto-containment, as there are potential legal issues and liabilities if left to operate automatically. With the usage of outdoor mesh APs to detect rogues would provide little value while it would use resources to analyze. However, there are certain scenarios in which rogue detection is not needed, for example, in Office Extend Access Point (OEAP) deployment, citywide, and outdoors. The best practice is to use rogue detection to minimize security risks, for example, in a corporate environment. Setup by an outsider, most times, with malicious intent.
When it is detected on the wired network. When setup to use the same Service Set Identifier (SSID) as your network (honeypot). A rogue becomes dangerous in these scenarios: Rogue OverviewĪny device that shares your spectrum and is not managed by you can be considered a rogue. If your network is live, ensure that you understand the potential impact of any command.
All of the devices used in this document started with a cleared (default) configuration. The information in this document was created from the devices in a specific lab environment.
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The information in this document is based on these software and hardware versions:Ĭisco Unified Wireless Lan Controllers (5520, 85 Series) that runs version 8.8.120.0. Prerequisites RequirementsĬisco recommends that you have knowledge of these topics: Cisco Unified Network Architecture provides methods for rogue detection that enable a complete rogue identification and containment solution without the need for expensive and hard-to-justify overlay networks and tools. Rogue detection allows the network administrator to monitor and eliminate this security concern. Therefore, an employee who brings his or her own Access Point (Cisco or Non Cisco) into a well-secured wireless or wired infrastructure and allows unauthorized users access to this otherwise secured network, can easily compromise a secure network. Less thought is put into port security on wired networks, and wireless networks are an easy extension to wired networks. However, an unauthorized wireless network presents an additional layer of security concern. Wireless networks extend wired networks and increase worker productivity and access to information. This document describes Rogue Detection and Mitigation on Cisco Wireless Networks.
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