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Some Broadband Users Go Online After Dialing up Repeatedly Several Times

Publication Date:  2012-07-27 Views:  36 Downloads:  0
Issue Description
In a network where multiple ME60 devices provide centralized processing, when the number of online users on an ME60 reaches the upper limit, some new users need to dial up repeatedly before they can go online. All ME60 versions involve this problem. 
Alarm Information
No alarm is displayed. When the trace command is used to display the online user information, the information shows that the ME60 still responds to PPPoE requests even if the number of online users already reaches the upper limit configured on the ME60. After the user passes RADIUS authentication, the ME60 detects that the number of online users has reached the maximum and displays that the dial-up access fails. The failure message for the dial-up access failure is Error 678. 
Handling Process
1. Check whether the number of BSU users already reaches the upper limit.
2. Check whether the number of ME60 users already reaches the upper limit.
3. Check whether the number of users in the domain already reaches the upper limit.
When a user cannot go online after dial-up repeatedly, ensure that the RADIUS server responds normally, and checks whether the online users of the ME60 already reach the maximum. If the online users of some ME60 devices already reach the maximum, whereas the online users of other ME60 devices do not, you can adjust the interval that the ME60 responds to an access user to a larger value. By default, the ME60 fast responds to access users.
Use the access-delay step 1000 minimum 0 maximum 64 command in the AAA view. Set the response interval increment to 10 ms in response to the increment of every 1000 users on the ME60. Set the minimum response interval to 0 and the maximum response interval to 640, in milliseconds. 
 
Root Cause
In a network where multiple ME60 devices deliver centralized processing, PODI broadcast packets are received on all BAS interfaces. The PPPoE client establishes a connection with the BAS interface that responds first. If each time the PPPoE client dials up and establishes connections with the same ME60 or the same BAS interface whose users already reach the maximum on the board where the BAS interface resides, the client cannot go online. This symptom appears even if other ME60s or other boards are still capable to process packets. 
Suggestions
The later software versions of the ME60 are hoped to check whether the online users already reach the maximum before responding to an access request from a new user. If yes, the ME60 does not respond to the request. 

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