AC6605 Access Controller
Dual-Link Backup White Paper
1
Dual-Link Backup
Issue 01 (2012-05-30)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
29
Enable the dual-link backup function on AC1 and AC2 and set a priority for each AC.
Run the following commands:
[AC6605_AC1] wlan
[AC6605_AC1-wlan-view] wlan ac protect enable protect-ac 30.30.30.2 priority 0
[AC6605_AC2] wlan
[AC6605_AC2-wlan-view] wlan ac protect enable protect-ac 30.30.30.1 priority 7
In the preceding commands,
protect-ac
specifies the IP address of the standby AC. Set
this parameter to the other AC's IP address on each AC.
The active AC must have a
higher priority than the standby AC. The value 0 indicates the highest priority, and the
value 7 indicates the lowest priority. A smaller value indicates a higher priority. Run the
display wlan ac protect
command to check the AC priorities.
[AC6605_AC1] display wlan ac protect
------------------------------------------------------------
Protect state : enable
Protect AC : 30.30.30.2
Priority : 0
Protect restore : enable
------------------------------------------------------------
[AC6605_AC2] display wlan ac protect
------------------------------------------------------------
Protect state : enable
Protect AC : 30.30.30.1
Priority : 7
Protect restore : enable
------------------------------------------------------------
1.4 Applications
1.4.1 Direct Forwarding in Layer 3 Chain Networking
As shown in Figure 1-14, two ACs are deployed in a Layer 3 chain networking and work in
dual-link backup mode to improve network reliability and ensure stable wireless services.
Data packets from STAs are directly forwarded. This networking mode simplifies the network
architecture and applies to large-scale WLANs where APs are deployed in a centralized
manner. An AC manages APs in multiple LANs but does not belong to any of the LANs.
AC1 is the active AC, and AC2 is the standby AC. It is recommended that you manually add
offline APs to the ACs. Perform the same service configurations (including user
authentication configuration) on the two ACs.
Configuration on the ACs is as follows:
Configure management VLAN 3010 and service VLAN 3931 for APs. Set the
management IP address of AC1 to 30.30.30.1, and management IP address of AC2 to
30.30.30.2. Enable DHCP on AC1 and AC2.
Configure the same carrier ID for the ACs. Enable dual-link backup and configure IP
addresses and priorities for the ACs. Ensure that the active AC has a higher priority
(smaller priority value) than the standby AC.
Configure non-overlapping IP address pools on the ACs. In this example, the IP address
pool on AC1 contains IP addresses 40.40.40.3 to 40.40.40.100, IP address pool on AC2
contains IP addresses on AC2 is 40.40.40.101 to 40.40.40.254. Set the gateway address
