[cisco-bba] Dynamic routing over L2TP LNS

[Arie Vayner]

Jose,

I would suggest thinking about other means of implementing what you need
instead of a routing protocol between the CPE and the LNS.
The scalability of routing protocols is not really at the same level as the
number of PPP sessions per LNS (which may be 1000's).

Are you aware of the option to download static route entries from RADIUS as
part of the user's profile? This would allow you to basically get the same
static route on any LNS the user connects to. If they have a failure, and
the PPP session goes down, the route would be also withdrawn, and then
readvertised from the backup connection.
The backup could be another dynamic PPP session (using the same mechanism)
or could be a floating route with a lower preference metric (or higher...
depends on how implemented).

Take a look here:
http://www.cisco.com/en/US/docs/ios/12_2/security/configuration/guide/scfathen.html

You should be looking for the 'cisco-avpair = "ip:route=' examples.

Would this work, or am I missing some critical part of the design?

Arie

On Sun, Jul 13, 2008 at 11:57 AM, Jose Bejarano <Jose.Bejarano at gmx.net>
wrote:

> Hi Arie,
>
> thanks, yeap, using a routing protocol between the LNS and CPE, users are
> then entering the L3 MPLS/VPN (using vrf Radius attributes). The idea is to
> improve convergence and backup functions
> adding a routing protocol. Unfortunately there is no much info about. QoS
> LNS<--->CPE is of course another big issue and we are thinking to use
> per-session QoS using Radius...
> Any experience would be appreciated !
>
> Cheers,
> Jose
>
>
>
> Am 11.07.2008 um 19:56 schrieb Arie Vayner:
>
> Jose,
>
> Are you asking about using a routing protocol between the LNS and the
> remote user's CPE, or are you talking about redistributing the addresses
> assigned to the PPP session (either the /32 or a static route) into the VPN?
>
> Arie
>
> On Fri, Jul 11, 2008 at 5:57 PM, Jose Bejarano <Jose.Bejarano at gmx.net>
> wrote:
>
>> Hi,
>>
>> we are terminating via L2TP our PPPoE users on a 7206vxr with npe-g1.
>> Customers are then terminating these sessions in a VRF using Radius
>> attributes.
>> Now we are planning to introduce dynamic routing functionality:
>> RIP,OSPF,BGP...
>> Any info/experiences/ideas/tips with using routing protocols over L2TP ?
>>
>> Thanks in advance,
>> Jose
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>
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