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1. Problems in the DHCP interaction process.
2. Problems in the DHCP interaction packets.
3. Field errors in the DHCP switch packets.
The problem in this case belongs to the third condition.
First, on the ME60, check the reason why the AP fails to go online. The returned messages are as follows:
<SHSJ-PC-CMNET-BRAS01-ME60>display aaa online-fail-record mac-address 001f-1625-31xx
User name : SHSJ-PC-CMNET-BRA-0910010240xxxx@xxxx-iptv
Domain name : xxxx-iptv
User MAC : 001f-1625-31xx
User access type : IPoE
User interface : GigabitEthernetx/x/0.99999999
User access PeVlan/CeVlan : 1024/512
User IP address : -
User IPv6 address : -
User ID : 492
User authen state : Authened
User acct state : AcctIdle
User author state : AuthorIdle
User login time : 2012-07-31 15:57:37
Online fail reason : DHCP with server no response
The AC manufacturer reckons that the DHCP server does not handle the request because the server IP address in the option54 of the DHCPREQUEST packet sent from the ME60 is inconsistent with the server IP address in the option54 of the DHCPOFFER packet sent from the AC to the ME60. As the manufacture reckoned, because NAT is performed on the server IP address, the server IP address configured in the DHCP server group of ME60 is 221.181.x.x whereas the server IP address in the offer packets from the DHCP server is 172.16.x.x.
Then, trace the MAC address. It is found that the ME60 sends the request to the DHCP server but the server does not return the ack message. The returned messages are as follows:
Dhcpacc send a packet to server.
DHCPACC proc a REQUEST pkt
Dhcpacc send msg SRV_MSG_DHCPACC_CM_CUT_REQ.
msgcode:209, DhcpaccIndex:251, cib/DhcpaIndex:494
DhcpaccIndex:251, DhcpaIndex:4294967295, cib:494, state:6( DHCPACC_WAIT_SERVER_ACK), DownReason:16]
User leave: DHCP with server no response]