All things related to multicast

["Lucy E. Lynch" <>]

Matthew -

That part I understand, although why they're not peering is a ?
Meanwhile, the announcement has twinkled off and now I get:

# mtrace -s 128.46.200.203 224.2.164.161
Mtrace from 128.46.200.203 to 128.223.214.23 via group 224.2.164.161
Querying full reverse path... 
  0  pythia.uoregon.edu (128.223.214.23)
 -1  cisco3-gw.uoregon.edu (128.223.214.1)  PIM  thresh^ 0  Prune sent 
upstream [default]
 -2  cisco7-gw.uoregon.edu (128.223.2.7)  PIM  thresh^ 0  Unknown error code 
8 [128.46/16]
Round trip time 78 ms

# mtrace -s 128.223.214.23 128.46.200.203 224.2.164.161
Mtrace from 128.223.214.23 to 128.46.200.203 via group 224.2.164.161
Querying full reverse path... 
  0  viper2.ecn.purdue.edu (128.46.200.203)
 -1  ascend-gw.customer.ALTER.NET (157.130.5.206)  DVMRP  thresh^ 1  Prune 
sent upstream [default]
 -2  ascend-gw.mbone.ALTER.NET (208.205.11.55)  PIM  thresh^ 32 [128.223/16]
 -3  Loopback0.MB1.KCY1.ALTER.NET (137.39.3.94)  Unknown protocol code 8 
thresh^ 0  Unknown error code 8 [128.223/16]
 -4  Loopback0.MB1.EWR1.ALTER.NET (137.39.3.92)  Unknown protocol code 8 
thresh^ 0  Unknown error code 8 [128.223/16]
 -5  MBGP-UO.Mbone.ALTER.NET (137.39.26.98)  PIM  thresh^ 32  Unknown error 
code 8 [128.223.214/23]
 -6  cisco3-gw.uoregon.edu (128.223.2.3)  PIM  thresh^ 0 [128.223.214/23]
 -7  pythia.uoregon.edu (128.223.214.23)
Round trip time 290 ms

and an explict join brings up a session with just me, as you'd expect.

- LEL

On Tue, 7 Mar 2000, Matthew Davy wrote:

> On Tue, Mar 07, 2000 at 11:29:05AM -0800, Lucy E. Lynch wrote:
> > A traceroute to the source address goes via Abilene, but mtrace goes via
> > ALTERNET. I assume this is the commodity route for Purdue. Why is 
> > multicast traffic between Abilene connected sites going out this
> > route? 
> 
> Purdue does NOT have multicast peering with Abilene.  This is why your 
> unicast
> and multicast paths to 128.46.200.203 are different. 
> 
> - Matt
>