[c-nsp] pppoe-link

[K bharathan]

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