All things related to multicast

[Marshall Eubanks <>]

"Lucy E. Lynch" wrote:

> mtrace 128.223.214.23 128.182.61.51
> Mtrace from 128.223.214.23 to 128.182.61.51 via group 224.2.0.1
> Querying full reverse path... * switching to hop-by-hop:
>   0  sandoz.psc.edu (128.182.61.51)
>  -1  packet shorter (576 bytes) than hdr+data len (20+1016)
> * packet shorter (576 bytes) than hdr+data len (20+1016)
> * * Timed out receiving responses
> Perhaps receiver 128.182.61.51 is not a member of group 224.2.0.1,
> or no router local to it has a route for source 128.223.214.23,
> or multicast at ttl 64 doesn't reach its last-hop router for that source
>
> Lucy E. Lynch                           Academic User Services
> Computing Center                        University of Oregon
> 
>              (541) 346-1774
> Cell: (541) 912-7998                    
> 
> Key fingerprint =  2C 80 2F 8C 5F 68 37 E3  AC 16 09 F1 36 E4 61 15
>
> On Mon, 8 Jan 2001, Michael H. Lambert wrote:
>
> > To update the responses I have received (thank you!):
> >
> > IOS Versions:  internal router     12.1(3a)T1  [RSP2]
> >                border router       12.0(12)S   [RSP4]
> >
> > I changed the addresses of the RPs after verifying that the previous ones
> > didn't pass RPF checks in the Abilene core.
> >
> > I'm not sure how often the SDP announcement is being sent (it's being
> > originated by SDR under MS Windows and exhibiting the usual black-box
> > behavior of that OS).  I'm going to see if I can get some of the tools up
> > under FreeBSD.
> >
> > Behavior I'm seeing now:  The internal router carries the announcement for
> > three minutes; it disappears for a while (hard to time); it comes back for
> > another three minutes.  It's not showing up in the sa-cache on the border
> > router at all.
> >
> > Any more hints?
> >
> > Thanks,
> >
> > Michael
> >

>

I believe that this doesn't tell much, as it doesn't know about the source - 
there is no MSDP.

On my router, at least, I can only mtrace to sources that I can see
anyway.

Maybe Bill has something to add.

--
                                 Regards
                                 Marshall Eubanks

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

     


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