[cisco-bba] l2tp failover and loadbalancing

[Raj Panchal]

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.


Thanks and Regards
Raj panchal

-----Original Message-----
From: Oliver Boehmer (oboehmer) [mailto:oboehmer at cisco.com] 
Sent: Friday, January 27, 2006 12:20 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 7:40 AM:

> Dear Oliver,
> Thanks for the response.
> 
> In your example, you mentioned
> Tunnel-Preference = :1:"10",
> 
> What I understand is that this attribute will allow preference of
> tunnel and its attributes when multiple reply items are being sent as
grouped
> items to user as part of his access-requests
> 
> As per RFC the order of preference is higher for lower value of
> Tunnel- Preference, but I can see in your example value is constant
> "10" across all the 3 groups tagged with 1,2,3
> 
> So precisely will your configuration help me load balancing or
> failover for Tunnel-Server-Endpoint

Yes, setting the preference to the same value for multiple tagged groups
does load-sharing among this group, so it does what you want.

I have never tried it, but with a config like

       Tunnel-Medium-Type = :1:IP,
       Tunnel-Server-Endpoint = :1:"10.1.1.1",
       Tunnel-Preference = :1:"10",
       Tunnel-Type = :2:L2TP,
       Tunnel-Medium-Type = :2:IP,
       Tunnel-Server-Endpoint = :2:"10.1.1.2",
       Tunnel-Preference = :2:"10",
       Tunnel-Type = :3:L2TP,
       Tunnel-Medium-Type = :3:IP,
       Tunnel-Server-Endpoint = :3:"10.1.1.3",
       Tunnel-Preference = :3:"10",
       Tunnel-Type = :4:L2TP,
       Tunnel-Medium-Type = :4:IP,
       Tunnel-Server-Endpoint = :4:"10.1.1.4",
       Tunnel-Preference = :4:"20",
       Tunnel-Type = :5:L2TP,
       Tunnel-Medium-Type = :5:IP,
       Tunnel-Server-Endpoint = :5:"10.1.1.5",
       Tunnel-Preference = :5:"20",
       Tunnel-Type = :6:L2TP,
       Tunnel-Medium-Type = :6:IP,
       Tunnel-Server-Endpoint = :6:"10.1.1.6",
       Tunnel-Preference = :6:"20"

we would load-share across 10.1.1.1, .2 and .3 (all pref=10), and
fail-over and load-share across .4, .5 and .6 (all pref=20) once all the
first three endpoints are unavailable..

	oli



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