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CLI-based Configuration Guide - WLAN-AC

AR100, AR120, AR150, AR160, AR200, AR1200, AR2200, AR3200, and AR3600 V200R010

This document provides the concepts, configuration procedures, and configuration examples of WLAN-AC features.
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Concepts of Basic WLAN Services

Concepts of Basic WLAN Services

  • Station (STA): a terminal that supports 802.11 standards, such as a PC that has a wireless network adapter or a mobile phone that supports WLAN, as shown in Figure 4-1.

    Figure 4-1  Centralized architecture
  • Access Controller (AC): a device that controls and manages all APs on a WLAN in the centralized architecture. For example, an AC can connect to an authentication server to authenticate WLAN users, as shown in Figure 4-1.

  • Access point (AP): a device that provides 802.11-compliant wireless access for STAs to connect wired networks to wireless networks.

    • Fit AP: provides wireless access for STAs in the Fit AP architecture. A Fit AP provides only reliable, high-performance wireless access for STAs and depends on an AC to provide other functions, as shown in Figure 4-1.
  • Control And Provisioning of Wireless Access Points (CAPWAP): an encapsulation and transmission mechanism defined in RFC5415 to implement communication between APs and ACs, as shown in Figure 4-1.

  • Radio signal: a high-frequency electromagnetic wave that has long-distance transmission capabilities. Radio signals provide transmission media for 802.11-compliant WLANs. Radio signals described in this document are electromagnetic waves in the 2.4 GHz or 5 GHz frequency band.

  • Virtual access point (VAP): a WLAN service entity on an AP. You can create different VAPs on an AP to provide wireless access service for different user groups.
  • Service set identifier (SSID): a unique identifier that identifies a wireless network. When you search for available wireless networks on your laptop, SSIDs are displayed to identify the available wireless networks.

    SSIDs are classified into two types:
    • Basic service set identifier (BSSID): the link-layer MAC address of a VAP on an AP. Figure 4-2 shows the relationship between VAP and BSSID.
      Figure 4-2  Relationship between VAP and BSSID
    • Extended service set identifier (ESSID): a chosen identifier for one or a group of wireless networks. For example, in Figure 4-2, SSID guest identifies one wireless network, and SSID internal identifies another ireless network. A STA scans all wireless networks and selects a wireless network based on the SSID. In general terms, an SSID refers to an ESSID.

      Multiple APs can use one ESSID to provide roaming service for users; however, their BSSIDs must be unique because the MAC address of each AP is unique.

  • Basic service set (BSS): an area covered by an AP. STAs in a BSS can communicate with each other.

  • Extend service set (ESS): a group of BSSs that share the same SSID.

    Figure 4-3 shows the relationship between SSID, BSSID, BSS, and ESS.

    Figure 4-3  Relationship between SSID, BSSID, BSS, and ESS
Updated: 2019-08-07

Document ID: EDOC1100033726

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