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S12700 V200R010C00 Configuration Guide - WLAN-AC

This document describes native AC (hereinafter referred to as WLAN AC) configuration procedures and provides configuration examples.
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Network Description

Network Description

In actual network planning, not all APs access the AC through X series interface cards; instead some APs connect to the AC through non-X series interface cards, such as S series and E series interface cards. To manage these APs on the AC, configure the Centralized AC function.

Figure 3-2  Connecting AP to a non-X series interface card

Centralized AC

As shown in Figure 3-2, X series and non-X series interface cards are bound to the same WLAN Work Group on the centralized AC. After the WLAN work group takes effect, AP CAPWAP packets reaching a non-X series interface card are automatically forwarded to the X series interface card for processing. The X series interface card then forwards the CAPWAP packets to the AC. In this way, the AC manages the APs by exchanging packets with them. Non-CAPWAP packets are directly forwarded to the AC but not to the X series interface card for processing.

WLAN Work Group
  • A WLAN work group can contain one X series interface card or two X series interface cards in master/slave mode. When the master X series interface card fails, the slave X series interface card undertakes ongoing WLAN services. When the master card recovers, WLAN services are not switched back until the slave card becomes faulty. Maximum numbers of supported users and APs must be the same on both cards.

  • A WLAN work group can contain multiple non-X series interface cards. APs can access the AC through an X series or a non-X series interface card in the WLAN work group.

  • Non-X series interface cards in a WLAN work group share X series interface card resources of the group. If any AP or user connects to the AC through an X series interface card, X series interface card resources are occupied. This reduces resources available in the WLAN work group. Additionally, master and slave X series interface cards provide different numbers of resources. As a result, some users are forced offline during a master/slave switchover due to insufficient resources. To prevent this situation, configure independent X series interface cards to serve only the non-X series interface cards in the WLAN work group but not to connect APs or users.

Default WLAN Work Group

Interface cards on the AC automatically join the default WLAN work group. Therefore, the centralized AC function can still be implemented when no WLAN work group is configured on the AC. If more than two X series interface cards exist on the AC, the first detected card is regarded as the master and the second as the slave. You are advised to configure a WLAN work group and add redundant X series interface cards to the WLAN work group to implement the centralized AC function, which improves resource usage efficiency and enables more traffic transmitting.

Networking Restrictions
  • When creating an Eth-Trunk that contains interfaces of different non-X series interface cards, ensure that all interfaces belong to the same group.

  • You cannot configure an Eth-Trunk containing interfaces from both an X series interface card and non-X series interface card.

  • An X series or a non-X series interface card can join only one WLAN work group.

  • If an AP is reconnected to a new non-X series interface card which belongs to the same WLAN work group as the AP's originally connected interface card, the AP and STA services are not interrupted. In other situations, the AP and STA are forced offline.

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Updated: 2019-04-20

Document ID: EDOC1000142094

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