[c-nsp] BGP sessions won't establish.

[Roy]

Thanks to all who responded.  ebgp-multihop and update-source are both 
present.  Routes are set because we can ping between the two routers 
even with setting the source IP address to the loopback interface.

I am going to substitute a test router and see if the same problem 
presents itself.


Christian Koch wrote:
> also ensure you have the update source set to loopback (neighbor 
> x.x.x.x update-source loopback0)
>
> -christian
>
>
> On Wed, Jun 25, 2008 at 6:13 PM, Tim Durack <tdurack at gmail.com 
> <mailto:tdurack at gmail.com>> wrote:
>
>     Do you have ebgp-multihop configured on the loopback session?
>
>     Tim:>
>
>     On Wed, Jun 25, 2008 at 8:58 PM, Roy <r.engehausen at gmail.com
>     <mailto:r.engehausen at gmail.com>> wrote:
>     > Hi,
>     >
>     > We are working with a new ISP for service.  This one is via
>     metro ethernet.
>     >  They require two BGP sessions.  One goes between the ends of
>     the ethernet.
>     >  The other BGP session is between a loopback interface on our
>     router and a
>     > loopback interface on one of the ISP's other routers.
>     >
>     > The first session comes up just fine but the second one using
>     loopback
>     > interfaces will not establish.  I did some packet traces using a
>     Linux box
>     > and tcpdump and it would seem that the packets from our loopback
>     session go
>     > into the metro ethernet and disappear.  When their router tries
>     to connect,
>     > the packets arrive and responses are sent but they too seem to
>     be ignored.
>     >
>     > The ISP blames us of course.  I told them the packets seem to be
>     going out
>     > the switch port to the metro ethernet.
>     > Has anyone seem such a problem?  Is there some strange magic
>     limit to the
>     > number of peers or something?
>     >
>     > Roy
>     > <http://puck.nether.net/pipermail/cisco-nsp/>
>
>