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Wrong Stacking type leads to authentication failure on BRAS

Publication Date:  2012-07-25 Views:  58 Downloads:  0
Issue Description
BRAS (MA5200G) > Router (NE80E) > Switch (S6506R) > MSAN (IPM UA500) > ADSL MODEM (End User)
Problem:
No user had been authenticating under BRAS. There was no user MAC on the BRAS. User MAC were learned, till on the Router (NE80E) thru the switch (S6506R).
Alarm Information
Null
Handling Process
You can check on BRAS (MA5200G) by using command:
 <Syd> debugging vlan packet
*Jun10 11:37:01 2010 Quidway VLAN/8/debug_case:Slot=1;
Receiving from Ethernet, interface = Ethernet1/0/0.1, Source MAC = 0000-5e0a-0c00, Destination MAC = 0000-5e0a-0c03, VLAN ID = 10, VLAN8021P = 0, Frame Tag = 0 Type = ARP
Here you can see the Frame Tag = 0, which should be Frame Tag = dot1q.
Use following command to change the stacking inner-ethertype:
UA5000(config)#stacking inner-ethertype 0x8100  
Root Cause
Currently, stacking inner-ethertype on MSAN (UA5000) is 0x3e9 (in decimal:1001)and BRAS needs inner-ethertype 0x8100,so it can not work at any time. 
UA5000 (config)#display stacking inner-ethertype                          
  The inner Ethernet type in the system: 0x3e9 
In Logs:
---------------------------------------------------------------------------   
  No.   UserName                          Domain            IP-Address          
   307  root                              --               10.128.0.205        
  Time: 2011-03-10 17:32:34                                                     
  Cmd:  stacking inner-ethertype 1001                                           
  ---------------------------------------------------------------------------  
Inner-ethertype, should be matched with the BRAS and in general, we will use inner-ethertype on MSAN (UA5000) is 0x8100,
Suggestions
 Null

END