[cisco-bba] l2tp failover and loadbalancing

Raj Panchal raj.panchal at vsnl.co.in
Fri Jan 27 05:18:42 EST 2006

Hi Oliver

My first requirement is to redirect the user tunnel to secondary LNS if
primary is not available.

Second requirement is if both of the LNS are available then do load
balancing in term of terminating users across LNS

What I meant in my previous question was, what would be the condition
resulting in Failover or Load balancing i.e 

If LAC find that Primary LNS is not available then what are the conditions
when LNS is flagged as not available by LAC

If LAC wants to do load balance the between the user tunnel setups , what
are the condition when both the LNS are alive but still user sessions will
be load balanced between different LNS by LAC ( how it finds that one LNS is
loaded and second is free to take up the load ) 

Thanks and Regards

-----Original Message-----
From: Oliver Boehmer (oboehmer) [mailto:oboehmer at cisco.com] 
Sent: Friday, January 27, 2006 3:18 PM
To: Raj Panchal; cisco-bba at puck.nether.net
Cc: cisco-nsp at puck.nether.net
Subject: RE: [cisco-bba] l2tp failover and loadbalancing

Raj Panchal <mailto:raj.panchal at vsnl.co.in> wrote on Friday, January 27,
2006 7:57 AM:

> Thanks Oliver ...
> Last question !!
> What would be ideal situation as per RFC for triggering load
> balancing or failover across the multiple end points.
> This would help me designing my test case.

I don't understand the question, can you please elaborate?

I think it boils down to your environment. what do you want to achieve?
In a simple case, just load-share across all your LNS, and you'll be
happy. You can use a vpdn session-limit on the LNS  to limit the # of
sessions in case they are not all of the same capacity to prevent some
LNS from being overloaded..


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