We Believe: vBNS multicast works

[Robert Olson]

>Now that Bill is under the impression that multicast IP works between BU
>and other places, can the other places see my transmission ???
>
>It is running from FENRIS.BU.EDU under the session name BOston
>University

Hm. We're seeing the session (at least I assume we're seeing it -- I'm at
home watching an rtpmon that shows that session with very little lossage,
but boston is showing some 80% lossages on its reception (that just went away).

Here are the mtraces. Again, one direction looks fine but the other isn't:

(dyfrig) % mtrace -t 127 dyfrig fenris.bu.edu 224.2.177.155
Mtrace from 140.221.9.172 to 128.197.160.83 via group 224.2.177.155
Querying full reverse path... 
  0  FENRIS.BU.EDU (128.197.160.83)
 -1  CGLNET-GW.BU.EDU (128.197.160.1)  DVMRP  thresh^ 1  
 -2  DNS.BU.EDU (128.197.253.148)  DVMRP  thresh^ 4  
 -3  CRC-EXT-GW.BU.EDU (128.197.253.4)  Unknown protocol code 8  thresh^ 0  
 -4  cs-atm0-0-12.cht.vbns.net (192.5.206.2)  Unknown protocol code 8
thresh^ 0  
 -5  cs-atm1-0-4.dng.vbns.net (204.147.130.73)  PIM/Static  thresh^ 0
Reached RP/Core
 -6  bluto-vbns.ctd.anl.gov (192.5.170.129)  PIM  thresh^ 32  
 -7  destiny.mcs.anl.gov (130.202.128.5)  PIM  thresh^ 6  
 -8  dyfrig.mcs.anl.gov (140.221.9.172)
Round trip time 100 ms; total ttl of 34 required.

Waiting to accumulate statistics... Results after 10 seconds:

  Source        Response Dest    Overall     Packet Statistics For Traffic From
140.221.9.172   224.0.1.32       Packet      140.221.9.172 To 224.2.177.155
     v       __/  rtt  374 ms     Rate       Lost/Sent = Pct  Rate
140.221.11.253 
130.202.128.5   destiny.mcs.anl.gov 
     v     ^      ttl    7       632 pps        0/1    = --%   0 pps
130.202.128.1  
192.5.170.129   bluto-vbns.ctd.anl.gov 
     v     ^      ttl   34       219 pps        0/1    = --%   0 pps
192.5.170.130  
204.147.130.73  cs-atm1-0-4.dng.vbns.net Reached RP/Core
     v     ^      ttl   34       313 pps        0/1    = --%   0 pps
204.147.130.74 
192.5.206.2     cs-atm0-0-12.cht.vbns.net 
     v     ^      ttl   34       315 pps        0/1    = --%   0 pps
192.5.206.1    
128.197.253.4   CRC-EXT-GW.BU.EDU 
     v     ^      ttl   34       262 pps        0/1    = --%   0 pps
128.197.253.148 DNS.BU.EDU     
     v     ^      ttl   34       218 pps        ?/1            0 pps
128.197.5.26   
128.197.160.1   CGLNET-GW.BU.EDU 
     v      \__   ttl   34       266 pps
128.197.160.83  140.221.9.172
  Receiver      Query Source

(dyfrig) % mtrace -t 127  fenris.bu.edu dyfrig  224.2.177.155
Mtrace from 128.197.160.83 to 140.221.9.172 via group 224.2.177.155
Querying full reverse path... * switching to hop-by-hop:
  0  dyfrig.mcs.anl.gov (140.221.9.172)
 -1  destiny-11.mcs.anl.gov (140.221.11.253)  PIM  thresh^ 6   [default]
 -2  bluto.ctd.anl.gov (130.202.128.1)  Unknown protocol code 8  thresh^ 0
Reached RP/Core
 -3  cs-dng.anchor.anl.gov (192.5.170.130)  Unknown protocol code 8
thresh^ 0  Reached RP/Core
 -4  cs-atm0-0-12.cht.vbns.net (204.147.130.74)  Unknown protocol code 8
thresh^ 0  
 -5  * * * * ? (192.5.206.1) didn't respond
 -6  * * * 
 -7  * * * 
 -8  * * * ...giving up
Round trip time 219 ms; total ttl of 3 required.


Results after 39 seconds:

  Source        Response Dest    Overall     Packet Statistics For Traffic From
   * * *        224.0.1.32       Packet      128.197.160.83 To 224.2.177.155
     v       __/  rtt   29 ms     Rate       Lost/Sent = Pct  Rate
192.5.206.2    
204.147.130.74  cs-atm0-0-12.cht.vbns.net 
     v     ^      ttl    1        50 pps        2/1964 =  0%  50 pps
204.147.130.73 
192.5.170.130   cs-dng.anchor.anl.gov Reached RP/Core
     v     ^      ttl    2        54 pps        9/1962 =  0%  50 pps
192.5.170.129  
130.202.128.1   bluto.ctd.anl.gov 
     v     ^      ttl    3       591 pps       -6/1953 =  0%  50 pps
130.202.128.5  
140.221.11.253  destiny-11.mcs.anl.gov 
     v      \__   ttl   10        69 pps        ?/1959        50 pps
140.221.9.172   140.221.9.172
  Receiver      Query Source