[c-nsp] pppoe-link

[K bharathan]

hi
i forgot to add that  as for the PPPOE model the downstream ISP self
provision the ADSL services with the NAS and Radius


On Sun, Oct 2, 2011 at 10:47 PM, K bharathan <kbharatan at gmail.com> wrote:

>
>
> On Sun, Oct 2, 2011 at 2:48 PM, Arie Vayner (avayner) <avayner at cisco.com>wrote:
>
>> I am not completely sure about the PPPoE model you have as you mention 2
>> different things:
>> - L2TP
>> - VPLS
>>
>> If you get a L2 circuit (VPLS) with no IP configured on it, and you
>> terminate PPPoE sessions on your router, then this is not L2TP, but
>> regular PPPoE.
>> PPPoE is a L2 protocol which runs directly over Ethernet and does not
>> require an IP layer (the customer does not get an IP address before the
>> PPP layer assigns it).
>>
>> With L2TP you would have an IP based tunnel from the SP, while they
>> terminate the PPPoE session, and they would tunnel it to your LNS. In
>> that case the LAC (SP BRAS) has to have IP connectivity to your LNS
>> device.
>>
>> Arie
>>
>> -----Original Message-----
>> From: cisco-nsp-bounces at puck.nether.net
>> [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of K bharathan
>> Sent: Sunday, October 02, 2011 11:40
>> To: cisco-nsp at puck.nether.net
>> Subject: [c-nsp] pppoe-link
>>
>> | upstream ISP |------------>| Fibre Link |---------->| downstream ISP
>> | (gw
>> rt) |
>>
>> Fibre link (1 line) is divided into 3 VLANS
>> 1 vlan for internet bandwidth (wan ip from upstream ISP
>> 1 vlan for DSL bandwidth (wan ip from upstream ISP)
>> 1 vlan (l2tp link) for PPPOE from their VPLS network; no wan ips on
>> this;
>>
>> the link terminates at downstream ISP gw router
>>
>> problem: there is no wan ip on the PPPoe link how a PPPoe server can  be
>> answering the DSL client; how can this particular link can be  connected
>> to the downstream ISP network; anybody has got any ideas ?
>> thanks
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>>
>
> thanks
>
> but what is the difference between regular PPPOE and L2TP; it seems i've to
> get more clarity from SP; but this given VLAN doe sn't have any IP; find
> difficulty to set a gw for
> the PPPoe server (NAS on cisco 2900 ISR router)sitting in the LAN
>
>
>