[c-nsp] BGPoPPPoEoA ?!

[Aaron]

Don't forget the static for the loopback

On Nov 15, 2007 2:30 PM, Gerald Krause <gk at ax.tc> wrote:
> On Thursday 15 November 2007 17:40:54 Adam Greene wrote:
> > Lots of o's in that subject line ...
> >
> > I'm trying to set up a BGP session over a PPPoEoA DSL line. This is in the
> > context of setting up redundant DSL lines to a single provider router. I
> > control both ends (PE and CE). PE is 7200 NPE 200, IOS 12.3(15b). CE is
> > 1841, IOS 12.4(17).
> >
> > I can't establish the BGP session. Both sides are in active state, but
> > won't go further.
> >
> > The PE ATM interface is configured as IP unnumbered pointing to Loopback 0.
> > The CE BGP neighbor thus points to the PE Loopback IP address. The PE BGP
> > neighbor points to the IP address assigned to the CE Dialer (a /32 from the
> > /23 block on the PE Loopback).
> >
> > I saw that the CE was reporting that the external BGP neighbor is not
> > directly connected, so I issued "neighbor A.B.C.D disable-connected-check"
> > to no avail.
> >
> > I tried specifying the update-source interface on both ends (loopback 0 on
> > PE, Dialer1 on CE) again to no avail.
> >
> > I'm wondering if I have to do something at the neighbor A.B.C.D transport
> > level, like disabling path-mtu-discovery (this is a wild shot in the dark).
> >
> > Has anyone else successfully established BGP over PPPoEoA before?
>
> Yes, and it (still) works. As Aaron and Peter already mentioned you should
> use "ebgp-multihop" on both systems. Our config looks like this:
>
> CE config:
> ==========
> !
> interface Dialer1
>  ! local IP address is always 10.250.250.50/32 and
>  ! remote-GW IP address 10.255.255.255 - from PPP/RADIUS
>  ip address negotiated
>  encapsulation ppp
>  ...
> !
> !
> router bgp 65534
>  neighbor 10.255.255.255 remote-as 123
>  neighbor 10.255.255.255 ebgp-multihop 2
>  ...
> !
>
> PE config:
> ==========
> !
> interface Loopback101
>  ip address 10.255.255.255 255.255.255.255
> !
> !
> router bgp 123
>  ...
>   neighbor 10.250.250.50 remote-as 65534
>   neighbor 10.250.250.50 ebgp-multihop 2
>   neighbor 10.250.250.50 update-source Loopback101
>  ...
> !
>
>
> --
> Gerald   (ax/tc)
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