| Fault Type | Service >> WLAN >> STA Online Failure |
| Issue | The scenario is in certain area, there are a lotof users connected to indoor AP. Average 17 STA per AP. Each users have basedspeed 5M. And there are peak hour, some of the users hard to get connected andneed to wait non-peak hour ( e.g. 4am) to get connected and do download things.  Topology is: S12700（V2R10）---S5720EI（V2R7）---S5700LI（V2R6）---AP（V2R7C10）---STA |
| Alarm Information | A large numberof wireless users cant receive an IP address by DHCP |
| Handling Process | 1 Customer user the DHCP servers, we check the ip pool find the there have many free address. 2 Trace both from the switch and the ap find dhcp packtes drop random 3 Check the accress switch configuration,found there have command of dhcp snooping. 4 Check the accress switch dhcp snooping table found DHCP snoopingbinding table is exhausted in the access switch <ACCESS_SWITCH_01>display dhcp snooping DHCP snoopingglobal running information : DHCPv4snooping : Enable DHCPv6snooping : Enable Static user maxnumber :256 Current staticusernumber : 0 Dhcp user maxnumber : 256 (default) Current dhcp usernumber : 256 Arp dhcp-snoopingdetect : Disable (default) Alarmthreshold : 100 (default) Checkdhcp-rate : Disable (default) Dhcp-ratelimit(pps) : 100 (default) Alarmdhcp-rate : Disable (default) Alarm dhcp-ratethreshold : 100 (default) Discarded dhcp packetsfor rate limit : 0 Bind-tableautosave : Disable (default) Offline removemac-address : Disable (default) Client positiontransfer allowed :Enable (default) DHCP snooping runninginformation for interface GigabitEthernet0/0/1 : DHCPsnooping : Enable Trustedinterface : No Dhcp user maxnumber :256 (default) Current dhcp and nduser number :15 Checkdhcp-giaddr : Disable (default) Checkdhcp-chaddr : Disable (default) Alarmdhcp-chaddr : Disable (default) |
| Root Cause | DHCP snooping binding table is exhausted in the access switch |
| Solution | Configuration the command“dhcp snooping enable no-user-binding”from the all of the access switch |
| Suggestions | For WLAN users not need configuration the dhcp snooping from the access switch, because from the AP already enable this. |
Unreasonable configuration of DHCP cause STA can't get the ip
Created: Apr 13, 2018 07:40:40Latest reply: Apr 16, 2018 08:56:23
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