[nsp] NPE-G1 and 50,000 l2tp sessions???

[Jason Lixfeld]

There are fragmentation issues that need to be taken into consideration  
when doing PPPoE/L2TP.  The fragmentation drives up the CPU load.  The  
G1 cannot handle 16,000 sessions in production, but it should be able  
to handle more than 2,500.  The fix is to reduce the MTU on the client  
side, use mss-adjust on the CPE (if Cisco) or fudge the MTU in the  
virtual template on the VXR (same mss-adjust as you would do on the  
VXR, I believe).

http://www.cisco.com/en/US/tech/tk175/tk15/ 
technologies_tech_note09186a0080093bc7.shtml
http://www.cisco.com/en/US/tech/tk175/tk15/ 
technologies_white_paper09186a0080093e55.shtml

On Jan 28, 2004, at 4:23 AM, Martin Robinson wrote:

> Hello ALL,
>
> We are in a bit of a jam trying to help a customer who is trying to do  
> broadband aggregation over DSL.  They are needing to do up to 50,000  
> PPP/L2TP sessions and are currently using a 7206VXR/NPE-G1 based on  
> Cisco's claim that each unit has the ability to handle up to 16,000  
> sessions.  They are currently using two units and maxing out at 2,500  
> sessions per unit at 90%+ CPU Utilization.
>
> Does anyone have experience of doing this successfully using NPE-G1's  
> or any other platform?  Please let me know if you have any insights  
> that could be helpful, or if we need to use addition equipment such as  
> Juniper or Redback would also be fine.
>
> Thanks Martin.
>
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