[c-nsp] BGPoPPPoEoA ?!

[Gerald Krause]

Ok, but I need none if the GW IP address from the PPP negotiation is the 
loopback IP address on the PE in question. That's why I have no configured 
static route on the CE.

On Thursday 15 November 2007 20:47:56 Aaron wrote:
> 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)