[cisco-bba] PPP: limiting number of concurrent sessions

Daniel Chapman dkcctc at gmail.com
Mon Dec 15 20:02:03 EST 2008

Have you looked at these commands?  I have used all three at some point.

ROUTER(config-bba-group)#sessions ?
  auto      Sessions auto commands
  per-mac   Per-MAC session configuration
  per-vc    Per-VC session configuration
  per-vlan  Per-VLAN session configuration


----- Original Message ----- 
From: "Victor Lyapunov" <victor.lyapunov at gmail.com>
To: <cisco-bba at puck.nether.net>
Sent: Monday, December 15, 2008 2:22 PM
Subject: [cisco-bba] PPP: limiting number of concurrent sessions

> Hello all
> The company I work for has a number of cisco routers acting solely as
> LAC, providing wholeshale services to other ISPs that terminate the
> subscriber PPP sessions in their LNS.
> We plan to start terminating the PPP sessions directly to our routers.
> Since we want limit the max-concurrent sessions per user to 1, we have
> to make sure that the radius can reliably detect and avoid double logins.
> We shall use free radius and expect to serve 100.000+ customers. Since
> radius protocol is not 100% reliable, extra mechanisms are often used
> when such a limit is imposed for the max concurrent sessions per user
> (e.g. the radius using telnet, finger or SNMP can contact the BRAS and
> verify if a particular user is already logged in or not)
> I want to ask from your experience what is the prefered method for
> avoiding double logins especially when such a large number of subscribers
> has to served?
> I am concerned that having the radius to contact the BRAS in-order to
> verify each double login attempt will result to a heavy performance impact
> for the BRAS
> Thnx
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