[cisco-bba] l2tp failover and loadbalancing

Raj Panchal raj.panchal at vsnl.co.in
Fri Jan 27 01:40:05 EST 2006

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

Thanks and Regards

-----Original Message-----
From: Oliver Boehmer (oboehmer) [mailto:oboehmer at cisco.com] 
Sent: Friday, January 27, 2006 11:59 AM
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 <> wrote on Friday, January 27, 2006 6:17 AM:

> Hello,
> Has any one tried failover and loadbalancing between 3com hiper LAC
> and Cisco LNS using Merit Radius.
> If yes then can you help me with radius config for the same ?

The Cisco LNS just accepts the sessions thrown at it, so no config
there, the load-balancing obviously happens at the LAC:
If 3com implemented RFC2868, just send multiple tunnel endpoints with
the same preference, i.e.

domain.com Password="....", Service-Type=Outbound-User
       Service-Type = Outbound-User,
       Tunnel-Type = :1:L2TP,
       Tunnel-Medium-Type = :1:IP,
       Tunnel-Server-Endpoint = :1:"",
       Tunnel-Preference = :1:"10",
       Tunnel-Type = :2:L2TP,
       Tunnel-Medium-Type = :2:IP,
       Tunnel-Server-Endpoint = :2:"",
       Tunnel-Preference = :2:"10",
       Tunnel-Type = :3:L2TP,
       Tunnel-Medium-Type = :3:IP,
       Tunnel-Server-Endpoint = :3:"",
       Tunnel-Preference = :3:"10"

I think sending several endpoints with the same tag works as well, i.e.

       Tunnel-Type = :1:L2TP,
       Tunnel-Medium-Type = :1:IP,
       Tunnel-Preference = :1:"10",
       Tunnel-Server-Endpoint = :1:"",
       Tunnel-Server-Endpoint = :1:"",
       Tunnel-Server-Endpoint = :1:""

Hope it helps,


cc'ing c-nsp as you sent the Q to both aliases..

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