Mòdul de xarxa Cisco NAC per a encaminadors de serveis integrats: manual d'usuari

1. Introducció

The Cisco NAC Network Module is an expansion module designed to extend Network Admission Control (NAC) capabilities to Cisco 2800 and 3800 Series Integrated Services Routers. This module integrates Cisco NAC Appliance Server functionalities directly into the router, enabling network administrators to manage a single device for data, voice, and security requirements in branch offices and smaller locations. It enhances network security by enforcing policies for devices attempting to access the network.

Un angle view of the Cisco NAC Network Module, showing its circuit board, heat sink, and network ports, designed for integration into Cisco Integrated Services Routers.

2. Configuració i instal·lació

2.1 Contingut del paquet

• Cisco NAC Network Module
• Documentation (This User Manual)

2.2 Requisits del sistema

• Compatible with Cisco 2800 and 3800 Series Integrated Services Routers.
• An available network module slot on the host router.
• Appropriate Cisco IOS Software version supporting the NAC Network Module.

2.3 Passos d'instal·lació

1. Apagar: Power off the Cisco Integrated Services Router and disconnect all power cables.
2. Localitza la ranura: Identify an available network module slot on the router chassis.
3. Insereix el mòdul: Carefully align the Cisco NAC Network Module with the chosen slot and slide it in until it is firmly seated. Ensure the module connectors are fully engaged.
4. Mòdul segur: Secure the module using any provided screws or latches on the router chassis.
5. Encès: Reconnect power cables and power on the Integrated Services Router.
6. Verifica la instal·lació: After the router boots, access its command-line interface (CLI) or management interface to verify that the NAC Network Module is detected and operational. Use commands such as show version or show module.

3. Funcionament

The Cisco NAC Network Module, once installed and configured, enforces security policies for devices attempting to access the network. Its primary function is to provide Network Admission Control, ensuring that only compliant and authorized devices connect to your network resources.

3.1 Basic Configuration Overview

Configuration of the NAC Network Module is typically performed via the Cisco IOS Command-Line Interface (CLI) or a compatible network management system. Detailed configuration commands and procedures are available in the specific Cisco IOS documentation for your router and module. Key operational aspects include:

• Policy Definition: Define network access policies based on user roles, device posture, and security compliance requirements.
• Autenticació: Configure authentication methods such as 802.1X, MAC authentication bypass, or web authentication for various network access scenarios.
• Autorització: Assign network access privileges (e.g., VLAN assignment, access control lists) based on successful authentication and policy evaluation.
• Accés convidat: Implement secure guest access policies to provide controlled network access for visitors.
• Seguiment i informes: Utilize router logging and monitoring tools to track NAC events, user authentications, and policy enforcement.

4. Manteniment

Regular maintenance ensures the optimal performance and security of your Cisco NAC Network Module and the overall network.

• Actualitzacions de firmware: Periodically check the official Cisco support website for firmware and software updates for both the NAC Network Module and the host Integrated Services Router. Apply recommended updates to benefit from new features, security patches, and performance improvements.
• Condicions ambientals: Ensure the router and module operate within the specified temperature and humidity ranges to prevent hardware degradation and failure. Maintain proper airflow around the router.
• Inspecció física: Conduct periodic visual inspections of the module and its connections for any signs of damage, loose cables, or excessive dust accumulation.
• Còpia de seguretat de la configuració: Regularly back up your router's configuration, including all NAC policies and settings. This allows for quick recovery in case of configuration errors or system failures.
• Log Review: Regularment review system logs and NAC event logs for any unusual activity, authentication failures, or policy violations that may indicate security issues or misconfigurations.

5. Solució De Problemes

This section provides guidance for common issues encountered with the Cisco NAC Network Module.

5.1 Problemes comuns i solucions

• Mòdul no detectat:
  Símptoma: The Integrated Services Router does not recognize the NAC Network Module after installation.
  Solució:
  1. Ensure the router is powered off before installation and then power cycled after installation.
  2. Verify the module is correctly and fully seated in its expansion slot.
  3. Check for compatibility issues between the module, your specific router model (Cisco 2800/3800 Series), and the installed Cisco IOS Software version.
  4. Inspect the module and slot for any physical damage.
• Network Access Denied Unexpectedly:
  Símptoma: Legitimate users or devices are unable to gain network access, or are placed into a restricted VLAN.
  Solució:
  1. Review the configured NAC policies and authentication logs on the router and any external authentication servers (e.g., RADIUS, TACACS+).
  2. Verify correct user credentials and device compliance status.
  3. Check for misconfigurations in the authentication server settings or policy rules.
  4. Ensure the device attempting to connect meets all posture requirements defined in the NAC policy.
• Degradació del rendiment:
  Símptoma: Network performance slows down or router CPU utilization increases significantly after NAC implementation.
  Solució:
  1. Monitor CPU and memory utilization on the router using CLI commands (e.g., show processes cpu, show memory).
  2. Optimize NAC policies to reduce processing overhead. Simplify complex rules where possible.
  3. Ensure the router has sufficient resources (CPU, RAM) to handle the NAC workload, especially with a large number of concurrent authentications.
• Indicadors LED:
  Símptoma: Module LEDs are not behaving as expected (e.g., not lit, blinking incorrectly).
  Solució:
  1. Consult the Cisco IOS documentation for your specific router and NAC Network Module to understand the meaning of different LED states (e.g., power, status, activity).
  2. A non-lit power LED typically indicates a power issue or improper seating.
  3. An amber or red status LED usually indicates a fault or error condition.

6. Especificacions tècniques

7. Garantia i Suport

For detailed warranty information, technical support, and additional product documentation, please refer to the official Cisco website or contact your authorized Cisco reseller. The Cisco support portal provides access to software downloads, knowledge bases, and community forums.

Official Cisco Weblloc: www.cisco.com