All things related to multicast

[Brent Sweeny <>]

Marshall, are you still connected through vBNS? there was a change
in the peering between Abilene and vBNS early this morning at MAX;
we know that it broke v6; perhaps multicast was affected too.
Matt just got in; perhaps he'll know.

On Tue, Aug 19, 2003 at 09:49:23AM -0400, Marshall Eubanks wrote:
> Hello;
> 
> 
> There seems to be some sort of MSDP problem out there this morning.
> 
> Symptom 1 - The RTCP beacon. There ius a new multicast beacon in testing,
> written by Mitch Kutzko. The view from here of the beacon status is given by
> 
> http://www.on-the-i.tv/beacon/beacon_loss.html
> 
> You will note that there are a number of beacons for which there are only 
> SSRC.
> This is beacuse we are not receiving the multicats hhere at multicasttech, 
> but
> we are
> receiving reports from other beacon sites that doe see these sites. This
> situation started at 6:10 AM this morning. (I archive the beacon reports.)
> 
> The list before 6:10 AM EDT
> 
>                 ag.mcs.anl.gov used port 10003 and SSRC   0x36761149 :     
> 25
> records read 
>                  qbridge.bu.edu used port 10003 and SSRC   0x2ae0a98f :     
> 13
> records read 
>                gemini.nersc.gov used port 10003 and SSRC   0x2852d542 :     
> 32
> records read 
>              orca.ncsa.uiuc.edu used port 10003 and SSRC   0x2ece81b9 :     
> 17
> records read 
>             dogma.nerdc.ufl.edu used port 10003 and SSRC   0x40230739 :     
> 12
> records read 
>             yendi.ncsa.uiuc.edu used port 10003 and SSRC   0x4f11b930 :     
> 10
> records read 
>            issola.ncsa.uiuc.edu used port 10003 and SSRC   0x3f4b68ac :     
> 15
> records read 
>            sarah.trace.wisc.edu used port 10003 and SSRC   0x4c11fd29 :     
> 18
> records read 
>           cadogan.ncsa.uiuc.edu used port 10003 and SSRC   0x184a64d9 :     
> 19
> records read 
>          starlsd.sl.startap.net used port 10003 and SSRC   0x7be93f89 :     
> 13
> records read 
>       hendrix.multicasttech.com used port 10003 and SSRC   0x45cb9469 :     
> 28
> records read 
>   dyn09.iacc-t21.ndsu.NoDak.edu used port 10003 and SSRC   0x397c59d1 :     
> 19
> records read 
> 
>  The list now.
> 
>                  ag.mcs.anl.gov used port 10003 and SSRC   0x36761149 :     
> 30
> records read 
>                  qbridge.bu.edu used port 10003 and SSRC   0x2ae0a98f :     
> 33
> records read 
>                gemini.nersc.gov used port 10003 and SSRC   0x2852d542 :     
> 28
> records read 
>       hendrix.multicasttech.com used port 10003 and SSRC   0x30cc598a :     
> 21
> records read 
>   dyn09.iacc-t21.ndsu.NoDak.edu used port 10003 and SSRC   0x397c59d1 :     
> 25
> records read 
>  
> So, we know that 
> 
> 1.) There are sites up
> 2.) Other sites that we can see can see them, but we cannot
> 3.) We still haev MBGP routes for these sites.
> 
> Symptom 2.) 
> 
> If you look at the multicast status page - 
> 
> http://www.multicasttech.com/status/ 
> Figure 5
> 
> you will see that the number of groups with SA's dropped, between 6:00 AM 
> and
> 8:00 AM,  from 1279 to 753.
> 
> So, combining all this info, I conclude that something in Abilene or I2
> is dropping MSDP SA's.
> 
> Regards
> Marshall Eubanks