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Configuration Guide - WLAN-AC

S5700 and S6720 V200R012C00

This document describes the configurations of WLAN, including WLAN Service Configuration, Radio Resource Management, Roaming, WLAN QoS, WLAN Security, WDS, Mesh, Location, Hotspot 2.0, Dual-Link Cold Backup, N+1 Backup.
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Inter-AC Roaming

Inter-AC Roaming

Network Architecture

Figure 8-4 shows the inter-AC roaming network architecture. AC_1 and AC_2 manage APs on the WLAN. AP_1 associates with AC_1, and AP_2 associates with AC_2. A STA roams on the WLAN. During roaming, the STA associates with different APs. The roaming process is as follows:

The STA moves from the coverage area of AP_1 to AP_2. Since AP_1 and AP_2 associate with AC_1 and AC_2, respectively, the STA implements inter-AC roaming. AP_1 and AC_1 are the STA's home AP (HAP) and home AC (HAC), and AP_2 and AC_2 are the STA's foreign AP (FAP) and foreign AC (FAC). AC_1 and AC_2 must belong to the same mobility group. The STA can only roam between ACs in the same mobility group. ACs in a mobility group synchronize data of each other and forward packets over the inter-AC tunnel.

Figure 8-4  Network architecture

  • HAC: AC in a mobility group with which a STA associates for the first time, for example, AC_1 in Figure 8-4
  • HAP: AP in a mobility group with which a STA associates for the first time, for example, AP_1 in Figure 8-4
  • FAC: AC to which a STA roams, for example, AC_2 in Figure 8-4
  • FAP: AP to which a STA roams, for example, AP_3 in Figure 8-4
  • Inter-AC roaming: A STA roams between different ACs. As shown in Figure 8-4, the STA roams between different ACs when roaming from AP_1 to AP_3.

  • Mobility group: You can add ACs on a WLAN to different groups. STAs can roam between ACs in the same group. This group is called mobility group.
  • Inter-AC tunnel: Inter-AC roaming requires that ACs in a mobility group synchronize STA and AP information with each other. To enable inter-AC roaming, the ACs set up a tunnel to synchronize data and forward packets. An inter-AC tunnel is also a CAPWAP tunnel. For example, AC_1 and AC_2 in Figure 8-4 set up a tunnel for data synchronization and packet forwarding.

Layer 2 Roaming

As shown in Figure 8-4, after Layer 2 roaming, the STA remains in the same subnet. The FAP/FAC processes packets of the Layer 2 roaming STA in the same way as it processes packets of a common online STA. The FAP/FAP forwards the packets on the local network but does not send the packets back to the HAP/HAC over the inter-AC tunnel.

Before Roaming After Roaming
  1. The STA sends a service packet to the HAP.
  2. After receiving the service packet, the HAP sends it to the HAC.
  3. The HAC forwards the service packet to the upper-layer network.
  1. The STA sends a service packet to the FAP.
  2. After receiving the service packet, the FAP sends it to the FAC.
  3. The FAC forwards the service packet to the upper-layer network.
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Updated: 2018-12-24

Document ID: EDOC1100038361

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