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.
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The ACs must deliver the same VAP to an AP. Manually add offline APs to AC1 and
AC2. It is recommended that the same AP ID be configured for an AP on AC1 and AC2.
Run the following commands:
[AC6605_AC1] wlan
[AC6605_AC1-wlan-view] ap id 0 ap-type WA601 mac 0025-9876-2633 sn A0928182
[AC6605_AC2] wlan
[AC6605_AC2-wlan-view] ap id 0 ap-type WA601 mac 0025-9876-2633 sn A0928182
Configure DHCP proxy on the downstream aggregation switch and specify IP addresses
of AC1 and AC2 as the DHCP server IP addresses. This configuration enables APs to
obtain IP addresses from the ACs through the aggregation switch.
dhcp relay server-ip 30.30.30.1
dhcp relay server-ip 30.30.30.2
The dhcp-relay command syntax differs on different switch models. For details about
this command, see the command reference of the aggregation switch. The aggregation
switch must support at least two DHCP server addresses for the DHCP relay agent.
In this example, configure a route to network segment 80.0.0.0 of the aggregation switch
on each AC. Run the following commands:
[AC6605_AC1] ip route-static 80.0.0.0 255.255.255.0 30.30.30.3
[AC6605_AC2] ip route-static 80.0.0.0 255.255.255.0 30.30.30.3
The DHCP Offer packets sent from an AC can reach the APs only when the AC has a
route to the network segment
80.0.0.0.
To prevent IP address conflicts, ensure that the IP address pools configured for APs on
AC1 and AC2 do not overlap each other.
Configure an IP address pool for APs on AC1.
[AC6605_AC1] ip pool ap-active
[AC6605_AC1-ip-pool-ap-active] gateway-list 80.0.0.8
[AC6605_AC1-ip-pool-ap-active] network 80.0.0.0 mask 255.255.255.0
[AC6605_AC1-ip-pool-ap-active] excluded-ip-address 80.0.0.1 80.0.0.7
[AC6605_AC1-ip-pool-ap-active] excluded-ip-address 80.0.0.9 80.0.0.19
[AC6605_AC1-ip-pool-ap-active] excluded-ip-address 80.0.0.101 80.0.0.254
[AC6605_AC1-ip-pool-ap-active] option 43 sub-option 3 ascii
HuaweiAC-30.30.30.1,30.30.30.2 //This configuration is mandatory in Layer 3
networking.
Configure an IP address pool for APs on AC2.
[AC6605_AC2] ip pool ap-active
[AC6605_AC2-ip-pool-ap-active] gateway-list 80.0.0.8
[AC6605_AC2-ip-pool-ap-active] network 80.0.0.0 mask 255.255.255.0
[AC6605_AC2-ip-pool-ap-active] excluded-ip-address 80.0.0.1 80.0.0.7
[AC6605_AC2-ip-pool-ap-active] excluded-ip-address 80.0.0.9 80.0.0.100
[AC6605_AC2-ip-pool-ap-active] excluded-ip-address 80.0.0.201 80.0.0.254
[AC6605_AC2-ip-pool-ap-active] option 43 sub-option 3 ascii
HuaweiAC-30.30.30.1,30.30.30.2 ///This configuration is mandatory in Layer 3
networking.
You can also manually assign IP addresses for APs in a batch. If this method is used, you
do not need to specify the IP address range in the address pools, but you still need to
configure an IP address pool and enable the DHCP server on each AC.
Manually perform the same service configurations on the ACs. Inconsistent service
configurations on the ACs will cause service switching failures.
In Layer 3 networking, AC1 and AC2 can use loopback IP addresses as source IP
addresses to communicate with APs. Source IP addresses of the ACs can be located on
