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

a. rahman isnaini r.sutan risnaini at indo.net.id
Thu Jun 26 06:43:06 EDT 2008


Your ISP doesn't have them on their config :)

a. rahman isnaini r.sutan

Roy wrote:
> 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/>
>>
>>
>
>
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