All things related to multicast

[Marshall Eubanks <>]

Hello All;

   Since yesterday evening we have been not able to get MSDP through
vBNS, which black-holes Abilene for us. There is no clear indication of the 
cause of the 
problem as yet, and I do not know if things are hosed in the other direction 
as well.


                                   Regards
                                   Marshall Eubanks

   Multicast Technologies, Inc.
   10301 Democracy Lane, Suite 410
   Fairfax, Virginia 22030
   Phone : 703-293-9624          Fax     : 703-293-9609     
   e-mail : 

     http://www.on-the-i.com         

 Test your network for multicast : http://www.multicasttech.com/mt/


-------- Original Message --------
Subject: [Fwd: Re: vBNS MSDP]
Date: Wed, 09 May 2001 06:13:06 -0400
From: Marshall Eubanks 
<>
Reply-To: 

Organization: Multicast Technologies
To: 
,
 Tech team 
<>,Matthew
 Davy 
<>

Hello;

Sometime between 
Tue May  8 16:55:20 EDT and 
Tue May  8 21:10:13 EDT 

we stopped getting MSDP SA's from them, and thus from Abilene. There seems to 
be no
indication of problems on our end.

>From communications with Abilene (see below) we have determined that things 
>seem OK to them,
so it seems likely that the problem is within vBNS.

There are no indications of RPF failures or other error states here. Can 
someone please look into
this ?

multicasttech-2>show ip msdp sum
MSDP Peer Status Summary
Peer Address     AS    State    Uptime/  Reset Peer Name
                                Downtime Count
144.228.240.254  1239  Up       1d20h    0     rp-rly.sprintlink.net
157.130.74.73    704   Up       1d02h    1     Tunnel52.MR1.TCO1.ALTER.NET
192.168.1.2      16517 Up       1d17h    2     loop0-mct3.multicasttech.com
195.90.65.9      3300  Up       03:50:43 10    ams-mr.nl.eqip.net
204.147.128.141  145   Up       4d14h    0     cs.dng.vbns.net

204.147.128.141 is the MSDP peer for both us and Abilene, so this may be 
where the problem is.

                                   Regards
                                   Marshall Eubanks

   Multicast Technologies, Inc.
   10301 Democracy Lane, Suite 410
   Fairfax, Virginia 22030
   Phone : 703-293-9624          Fax     : 703-293-9609     
   e-mail : 

     http://www.on-the-i.com         

 Test your network for multicast : http://www.multicasttech.com/mt/


-------- Original Message --------
Subject: Re: Abilene MSDP
Date: Tue, 8 May 2001 21:33:00 -0500
From: Matthew Davy 
<>
To: Brent Sweeny 
<>
CC: Marshall Eubanks 
<>,Tech
 team 
<>,
 Bill Owens 
<>,NOC
 Abilene 
<>
References: 
<>
 
<>
 
<>

I remember something about that from last week.  But it seems like there was
just some confusion between two separate problems.  As I remember the email
said we were announcing routes to them with a next-hop of the STARTAP router.
This simply can't be !  Okay, it's not impossible, but highly unlikely.  It's
more likely that we'd announce the next-hop of another interface on our 
router.
But we're running the code with a fix for that bug...

In any case, we need to get the folks at vBNS to take a look at their router.

Marshall, have you contact them yet ?

- Matt

 


On Tue, May 08, 2001 at 09:25:48PM -0500, Brent Sweeny wrote:
> this does remind me of something Chris said today, though, about
> vbns refusing some of our announcements because it appeared that
> the next-hops were Startap (if i remember correctly?).  this 
> sounds a lot like a problem discussed last week, but he said it was
> just yesterday.  but that's all i heard about it.   ring any bells?
> 
> On Tue, May 08, 2001 at 09:12:56PM -0500, Matthew Davy wrote:
> > 
> > You should get our sources through the MIX or vBNS.  Which paths are you
> > preferring for routes traversing AS11537 ?  I'm guessing the vBNS...
> > 
> > Our MSDP and MBGP sessions with vBNS are up.  Our router that peers with 
> > vBNS
> > has about 3400 MSDP SAs in it's cache.   Perhaps there's something 
> > happening
> > on the vBNS side. 
> > 
> > By chance are you RPF failing on our SA's ?  I've seen this a couple of 
> > times
> > where SAs get lost in vBNS, but someone is preferring their MBGP 
> > announcements
> > over another ISP.
> > 
> > - Matt
> > 
> >  
> > 
> > 
> > On Tue, May 08, 2001 at 10:03:17PM -0400, Marshall Eubanks wrote:
> > > It looks like we have lost all MSDP to Abilene and
> > > points seen through Abilene. This causes the drop in the number
> > > of AS with multicast sources seen
> > > in Figure 4 of http://www.multicasttech.com/status/index.html
> > > 
> > > 
> > > 
> > >                                    Regards
> > >                                    Marshall Eubanks
> > > 
> > > 
> > >    Multicast Technologies, Inc.
> > >    10301 Democracy Lane, Suite 410
> > >    Fairfax, Virginia 22030
> > >    Phone : 703-293-9624          Fax     : 703-293-9609     
> > >    e-mail : 
> > > 
> > >      http://www.on-the-i.com         
> > > 
> > >  Test your network for multicast : http://www.multicasttech.com/mt/
> 

-- 
--------------------
Matthew Davy                  

                     
812-855-7728
Network Engineer
Indiana University 
Abilene NOC
--------------------