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MOD-160 PPPoE Capacity

I have ASR 9010 with IOS-XR 6.4.2 i already have more than 50 Bundle as a PPPoE access interface , where each is carrying Max 4000 subscriber in the bast week we increased the user in one bundle and we reached 8600 subscriber , but we faced an issue that only subscriber under this bundle get disconnected randomly , and i get below error message when i reach 8500 subscriber 

RP/0/RSP0/CPU0:FTTH-BNG-AIN-02#show subscriber manager disconnect-history last summ
Wed May 8 21:03:13.790 GMT

[ IEDGE DISCONNECT HISTORY LAST SESSIONS ]

Location: 0/RSP0/CPU0

Interface Time Disconnected Disconnect reason
========= ================= =================

BE42.429.pppoe39122 2019:05:08 21:02:51 PPP NCP FSM triggered down, DC: 0 AC: 30 TC: 17
BE42.334.pppoe18506 2019:05:08 21:02:51 PPP NCP FSM triggered down, DC: 0 AC: 30 TC: 17
BE42.429.pppoe39121 2019:05:08 21:02:51 PPP NCP FSM triggered down, DC: 0 AC: 30 TC: 17
BE42.429.pppoe39123 2019:05:08 21:02:51 PPP NCP FSM triggered down, DC: 0 AC: 30 TC: 17
BE16.510.pppoe618 2019:05:08 21:02:51 Clear subscriber by master request, DC: 0 AC: 52 TC: 6
BE42.429.pppoe39124 2019:05:08 21:02:51 PPP NCP FSM triggered down, DC: 0 AC: 30 TC: 17

 

when i do more investigation i found below issue as well 

 

Pending Callbacks: PPSM->Subdb-DESTROY,PPSM-Sub>Policy-Disc,Policy-Disc>PPSM,

 

the bundle has two 10G interface that below to the same NP and there is no other subscriber under this NP ,

i wonder if this issue is related to limitation of number of subscriber under Bundle-Ether , or it is related to a different issue 

 

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