[cisco-bba] LNS redundancy

[Hitesh Vinzoda]

Hi Arie,

Could you please tell me how the first hop redundancy for pppoe clients
would be achieved?

Regards

Hitesh

On Wed, Mar 23, 2011 at 4:33 PM, Arie Vayner <ariev at vayner.net> wrote:

> Just ask the Telco to open L2TP tunnels to both LNSs. They can configure
> them as active/active (split the users on both LNSs) or active/passive
> (depends on the LAC vendor...)
>
> Arie
>
> On Wed, Mar 23, 2011 at 9:26 AM, Hitesh Vinzoda <vinzoda.hitesh at gmail.com>wrote:
>
>> Hi,
>>
>> I m trying to achieve redundancy for gateway of pppoe adsl clients on LNS.
>> My scenario is as below.
>>
>> > Telco LAC sends the PPPOE session to our LNS using L2TP to LNS. It sends
>> it to Primary LNS at all the time till the Primary LNS is alive.
>> > If primary LNS fails than Telco LAC creates tunnel to secondary tunnel.
>> All connections are teared down and sent to secondary LNS.
>> > Since we know that gateway or default route configured on ADSL PPPoE
>> clients needs to unique as these are the attributes sent out by Radius or
>> DHCP and configured manually
>> > So in case if primary LNS fails than the IP address on virtual template
>> on LNS should be available to PPPOE clients. I tried different ways to
>> achieve this
>>
>> 1. HSRP on virtual-template interface is not supported.
>> 2. If i use internal physical interface on both LNS and run HSRP, while
>> having ip unnumbered fa0/0 under virtual-template configuration. The virtual
>> template takes the physical ip address instead of virtual ip.
>>
>> Lastly i thought of having anycast to have resue the situation.
>>
>> > Configured loopback interfaces on both the LNS with the same ip address
>> 20.20.20.1 and ip unnumbered command under virtual-template interface. This
>> works like charm.
>>
>> I m just wondering that is my solution correct or justifies the ISP LNS
>> scenario? or what are other methods to achieve redundany in LNS for gateway
>> ip address of pppoe.?
>>
>> Thanks in advance
>>
>> Hitesh
>>
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>>
>
>
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