[c-nsp] 7206 LNS/L2TP using HSRP

[Arie Vayner (avayner)]

With HSRP, every time you do a failover, all sessions would drop, and
have to be reestablished.

 

Using the redundancy model, you can have graceful recovery and
switchover if you want to control it.

 

For example, if you had a failure, and one LNS went down, all sessions
would reestablish on the 2nd one (that is the same as in HSRP), but now
when the other box comes up it does not drop all the sessions again and
switches them back.

Only new sessions would be sent to the recovered LNS, and you can move
the other sessions during a maintenance window...

 

Actually, I would just suggest running them in active/active mode. This
way you actually know they are both up and running and do not have to
worry about making sure the backup is ready...

 

Arie

 

From: ar [mailto:ar_djp at yahoo.com] 
Sent: Thursday, May 03, 2012 07:27
To: Arie Vayner (avayner); cisco-nsp
Subject: Re: [c-nsp] 7206 LNS/L2TP using HSRP

 

Thanks Arie.

 

Any disadvantage of using HSRP compared to multiple initiate-to commands
on the LAC?

I want HSRP due to the reason i can control who is the active and
standby LNS.

LNS  is mine, while LAC is on the access provider side.

 

thanks

 

________________________________

From: Arie Vayner (avayner) <avayner at cisco.com>
To: ar <ar_djp at yahoo.com>; cisco-nsp <cisco-nsp at puck.nether.net> 
Sent: Thursday, May 3, 2012 7:09 PM
Subject: RE: [c-nsp] 7206 LNS/L2TP using HSRP


Better use discrete IP addresses. Loopbacks are mostly recommended.
On your LAC you can specify multiple IPs (that can come from RADIUS...).

This would allow you to load share, running your LNSs in Act/Act mode...

Look here:
http://www.cisco.com/en/US/tech/tk827/tk369/technologies_white_paper0918
6a00800a43e9.shtml#wp1002265 

Arie

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of ar
Sent: Thursday, May 03, 2012 00:37
To: cisco-nsp
Subject: [c-nsp] 7206 LNS/L2TP using HSRP

Guys,


I'm planning to terminate L2TP to LNS using HSRP. 
So there will be LNS redundancy.
Is this possible?
I've read that terminating L2TP to the HSRP address has some issues.
 
Or better to use multiple initiate-to commands on the LAC?
Any other options for fail-over/redundancy?

thanks
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