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Fat AP and Cloud AP V200R008C00 CLI-based Configuration Guide

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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
RU Online Process

RU Online Process

IP Address Allocation

An RU obtains an IP address in any of the following modes:
  • Static mode: An IP address is manually configured for an RU. CAPWAP packets between the central AP and RUs are forwarded at Layer 2 and are independent of IP addresses. Therefore, the configuration of a static IP address does not affect the RU going online. Ensure that a route is reachable between the IP address of the RU and the central AP source address. Otherwise, services involving IP addresses may be affected, for example, Telnet.
  • DHCP mode: An RU functions as a DHCP client and requests an IP address from a DHCP server.

CAPWAP Tunnel Establishment

The central AP manages and controls RUs in a centralized manner through CAPWAP tunnels. CAPWAP tunnels provide the following functions:
  • Maintain connectivity states between the central AP and RUs.
  • Help the central AP to manage and deliver configurations to RUs.

Management packets between the central AP and RUs are transmitted through CAPWAP control tunnels between them.

When RUs are connected to an AD9430DN-12 or AD9430DN-24, service data packets between the central AP and RUs are transmitted through the MAC-IN-MAC data tunnel. When RUs are connected to an AD9431DN-24X, service data packets between the central AP and RUs are transmitted through the CAPWAP data tunnel.

Figure 16-7 shows CAPWAP tunnel establishment between the central AP and RU.

Figure 16-7  CAPWAP tunnel establishment

  1. Discovery phase (an RU discovers a central AP): An RU sends a Discovery Request packet to find a central AP.

    An RU can discover a central AP in either of the following two modes.
    • When no IP address list of central APs is configured on an RU, the RU will broadcast Discovery Request packets to automatically discover a central AP in the same network segment and then selects a central AP to establish a CAPWAP tunnel according to the returned Discovery Response packets.

    • A static IP address list of central APs is preconfigured on an RU. When the RU goes online, it sends a unicast Discovery Request packet to each central AP whose IP address is specified in the IP address list. After receiving the Discovery Request packet, the central APs return Discovery Response packets to the RU. The RU then selects a central AP to establish a CAPWAP tunnel.

  2. The RU establishes a CAPWAP tunnel with a central AP.

    CAPWAP tunnels include data tunnels and control tunnels. A control tunnel transmits control packets between the RU and central AP. You can choose to enable datagram transport layer security (DTLS) encryption over the control tunnel to ensure security of CAPWAP control packets. Subsequently, all CAPWAP control packets will be encrypted and decrypted through DTLS, ensuring integrity and privacy of the CAPWAP control packets.

CAPWAP Tunnel Maintaining

The RU and central AP periodically exchange heartbeat packets to monitor the CAPWAP tunnel connectivity.

RU Access Control

When an RU requests to access the central AP, the RU sends an Authentication Request packet to the central AP. The central AP then determines whether to permit the RU access and returns an Authentication Response packet to the central AP. The Authentication Response packet carries the RU software upgrade mode and RU version.

Figure 16-8 shows the RU access control flowchart.

Figure 16-8  RU access control flowchart

RU Software Upgrade

The RU determines whether its system software version is the same as that specified on the central AP according to parameters in the received Authentication Response packet.

  • If so, the RU goes to the next stage.

  • If not, the RU upgrades its version in the upgrade mode carried in the Authentication Response packets. The upgrade mode includes the AC mode, FTP mode, and SFTP mode.

    After the software version is updated, the RU restarts and repeats the preceding steps.

Central AP Configuration Delivery

The central AP sends a Configuration Update Request packet to RUs to deliver the service configurations to the RUs.

Updated: 2019-01-11

Document ID: EDOC1000176006

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