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Luck of ip adresses in ME60 ip pools caues the 'error 743' in adsl user modems

Publication Date:  2012-07-27 Views:  79 Downloads:  0
Issue Description
Network: In a metro Ethernet network we use the BRAS ME60 with version (V600R002C02SPC200).For topology see bellow.
The switch S8500 connects many DSLAM (Alcatel and Huawei DSLAMs).
Problem description: For many users the ADSL modem fails to authenticate and the modem display this error message that means 'Error734:The PPP protocol was terminated'
Users try many times before they get authenticated and access the internet service.



Alarm Information
null

Handling Process
- We add a new ip pool to the BRAS to have more ip.

Root Cause
First we trace one object access-user using the ADSL modem mac-adrress, and we observe terminal messages.
we used commands:
   <ME60> trace access-user object 1 mac-address 001e-74e8-6519
   <ME60> terminal debugging
   <ME60> terminal monitor
When the user fails to authenticate we get this message:
--------------------------------------------

Sep 27 2011 16:41:54.560.7 BAS_ME60_CASA_ANWAL_01 BTRC/7/BTRC_DebugInfo:
--[2011/9/27 16:41:54-][objectID=1][slotID=0][AAA]
[user info:
MAC Address : 001e-74e8-6519
IP Address : 255.255.255.255
PE VLAN ID : 196
CE VLAN ID : 0
USERNAME : testadsl2012@menara]
[trace info: User leave: CM with IP address alloc fail]

Sep 27 2011 16:41:54.560.8 BAS_ME60_CASA_ANWAL_01 BTRC/7/BTRC_DebugInfo:
--[2011/9/27 16:41:54-][objectID=1][slotID=4][PPPOE]
[user info:
MAC Address : 001e-74e8-6519
PE VLAN ID : 0
CE VLAN ID : 0
]
[trace info:Send PADT packet. ]
----------------------------------------------


- Second step we display ip-pools using command (display ip pool)

-----------------------------------------------------------------------
Pool-Name : menara1
Pool-No : 1
Position : Local Status : Unlocked
Gateway : 41.250.72.1 Mask : 255.255.248.0
Vpn instance : H_IE
IP address Statistic
Total :2045
Used :2045 Free :0
Conflicted :0 Disable :0
Designated :0 Gateway :0
Ratio :100%
-----------------------------------------------------------------------


We found that all ip pools of internet service was used at 100%,so there is no ip to allocate to new users.


Suggestions
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END