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New APs Cannot be Registered

2020-03-04 发表
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孟普 五段
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组网及说明




问题描述

过程分析

 1. The AP of the same model is already online, so it is not a version problem;

2. Check whether the license is sufficient, we find that the license is sufficient.

dis wlan ap all
Total number of APs: 4058
Total number of connected APs: 3880
Total number of connected manual APs: 3873
Total number of connected auto APs: 7
Total number of connected common APs: 231
Total number of connected WTUs: 3487
Total number of inside APs: 0
Maximum supported APs: 4096
Remaining APs: 378
Total AP licenses: 1536
Local AP licenses: 1536
Server AP licenses: 0
Remaining Local AP licenses: 433.25
Sync AP licenses: 0

                                 AP information
 State : I = Idle,      J  = Join,       JA = JoinAck,    IL = ImageLoad
         C = Config,    DC = DataCheck,  R  = Run,   M = Master,  B = Backup


3. After checking the communication between AC and the new AP IP, we found that AP did not get the address normally.


4.Check the address pool on AC and find that the address pool has been allocated, but there are not that many AP"s.Looking at the pool of conflicting addresses, you find a large number of conflicting addresses.


5. Check the arp information of the access switch and find that one MAC corresponds to more than one IP, corresponding to the address in the conflicting address pool.


===display arp all===============
===================================================
                Type: S-Static    D-Dynamic
IP Address       MAC Address     VLAN ID  Interface              Aging Type
10.100.44.173    80f6-2e4e-9c60  2110     GE1/0/2                17    D
10.100.44.252    80f6-2e4e-9c60  2110     GE1/0/2                17    D
10.100.45.50     80f6-2e4e-9c60  2110     GE1/0/2                17    D
10.100.45.106    80f6-2e4e-9c60  2110     GE1/0/2                17    D
10.100.36.170    80f6-2e4c-4a00  2110     GE1/0/6                17    D
10.100.44.190    80f6-2e4c-4a00  2110     GE1/0/6                17    D
10.100.44.254    80f6-2e4c-4a00  2110     GE1/0/6                17    D
10.100.45.44     80f6-2e4c-4a00  2110     GE1/0/6                17    D
10.100.44.182    70ba-efca-1f20  2110     GE1/0/8                17    D
10.100.44.198    70ba-efca-1f20  2110     GE1/0/8                17    D
10.100.45.22     70ba-efca-1f20  2110     GE1/0/8                17    D
10.100.45.32     70ba-efca-1f20  2110     GE1/0/8                17    D
10.100.45.52     70ba-efca-1f20  2110     GE1/0/8                17    D
10.100.45.107    70ba-efca-1f20  2110     GE1/0/8                17    D




6.Analyze the principle of DHCP


(1) The client broadcasts a DHCP-DISCOVER message to locate a DHCP server.


(2) Each DHCP server offers configuration parameters such as an IP address to the client in a

DHCP-OFFER message. The sending mode of the DHCP-OFFER is determined by the flag

field in the DHCP-DISCOVER message. For more information, see "DHCP message format."


(3) If the client receives multiple offers, it accepts the first received offer, and broadcasts it in a

DHCP-REQUEST message to formally request the IP address. (IP addresses offered by other

DHCP servers can be assigned to other clients.)


(4) All DHCP servers receive the DHCP-REQUEST message. However, only the server selected by the client does one of the following operations:

 Returns a DHCP-ACK message to confirm that the IP address has been allocated to the

client.

 Returns a DHCP-NAK message to deny the IP address allocation.

After receiving the DHCP-ACK message, the client verifies the following details before using the

assigned IP address:

The assigned IP address is not in use. To verify this, the client broadcasts a gratuitous ARP

packet. The assigned IP address is not in use if no response is received within the specified

time.

The assigned IP address is not on the same subnet as any IP address in use on the client.

Otherwise, the client sends a DHCP-DECLINE message to the server to request an IP address

again.

 

7. There should be a loop below, which causes the terminal to repeatedly apply for the address, leading to the exhaustion of the address pool, and then the newly added AP cannot obtain the address, leading to the failure to go online.


解决方法

Clear the conflict address pool, remove the loop and AP will normally get the address.


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你上面的组网图是ENSP画的吗?

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