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APs in idle state and do not register with AC6005

Publication Date:  2017-11-14 Views:  2798 Downloads:  0
Issue Description

APs in idle state and do not register with AC6005.

DHCP server is configured on USG6370 running V100R001C30SPC600


APs successfully receive the IP addresses but not also the correct option 43 in DHCP message:







Handling Process

Investigate how DHCP option 43 is configured on DHCP server.

Solution

AP’s went successfully online after issuing the following command:

option 43 hex 030831302E312E372E31

03 is the sub option id that huawei ac is using to save ac ip address.

08 is the length of the ip address, included the dots.

In order to calculate the length, count all the strings from the ip address including the dots and after convert the value to hex.

Example how to calculate the length of ACs ip address:

192.168.100.1 = 13  => Convert from decimal to hex 0x0D

10.1.7.1 = 8 => Convert from decimal to hex 0x08

192.168.100.1,192.168.100.2 =27 => Convert from decimal to hex 1B

And then, reverse the ip address from string to hex.

string -> hex

1 -> 31

0 -> 30

. -> 2E

1 -> 31

. -> 2E

7 -> 37

. -> 2E

1 -> 31

And then we can reverse the 10.1.7.1 to 030831302E312E372E31

Note:

An AP can store maximum 4 valid AC Ip Addresses and dhcp server can deliver via option-43 32­ AC IP Addresses at most.

option 43 ip 10.1.7.1 Can not work because in version V100R001C30SPC600 it will not deliver sub-option 3 to DHCP Client which is being used by Huawei AP.

This command is being used in this version to accommodate other AP vendors.

 

END