[AG-TECH] Multicast statistics

[Osland, CD (Chris)]

Steve,

Maybe I'm alone in this, but I'm afraid my knowledge of
networking falls way short of allowing me to understand this note -
it seems to be targetted at network people, not AG people (very
different groups here at RAL).

Are the commands you suggest Windows, Linux or both?

What is a group address?

Cheers

Chris

____________________________________________________________________
Chris Osland                                               Office tel: +44
(0) 1235 446565
Digital Media and Access Grid                          Medialab tel: +44 (0)
1235 446459
BIT Department                                     Access Grid room tel: +44
(0) 1235 445666
e-mail:   C.D.Osland at rl.ac.uk                                       Fax: +44
(0) 1235 445597
CLRC Rutherford Appleton Laboratory (Bldg. R18)
Chilton, DIDCOT, Oxon OX11 0QX, UK
[The contents of this email are confidential and are for the use of the
intended recipient only.
If you are not the intended recipient do not take any action on it or show
it to anyone else,
but return this email to the sender and delete your copy of it.]





> -----Original Message-----
> From: owner-ag-tech at mcs.anl.gov [mailto:owner-ag-tech at mcs.anl.gov]On
> Behalf Of Williams S.R.
> Sent: 28 May 2004 10:24
> To: ag-tech at mcs.anl.gov
> Subject: [AG-TECH] Multicast statistics
> 
> 
> Hi All
> 
> We are doing some work on providing 'protected' multicast for 
> AG nodes as
> well as other multicast services. Two things:
> 
> 1) If anyone has had performance issues related to multicast 
> we'd be very
> interested to hear about them, especially if they are campus 
> related. Also
> if you have 'protected' your multicast in any way by using topology or
> traffic engineering (VLAN, QoS) that would be interesting.
> 
> 2) Also, we have packet dump data for AG conferences, in 
> order to look at
> packet burstiness etc, but would like some more just to be 
> sure we have a
> representative sample. If there is any chance that you could 
> provide data
> such as that from a:
> 
> snoop -r -tr -S [group address]
> 
> or
> 
> tcpdump -n host [group address]
> 
> i.e. basically with: timestamp, IP source, Group destination, 
> packet length
> 
> These packet traces would be very useful to confirm our 
> current data. Info
> from test sessions, or from real conferences, would be useful - with
> anything from two to 20 participants. None of the data given 
> will be made
> public - just the summary info. Please state how many 
> participants and the
> bandwidth used if possible.
> 
> The trace need only be 10 to 15 seconds long...
> 
> The final document will be publicly available of course...
> 
> Cheers
> 
> Steve
> 
> -------------------------------------------------------------
> Steve Williams
> Video Network Manager
> University of Wales Swansea
> Singleton Park
> Swansea
> SA2 8PP
> 
> +44 (0)1792 295167
> s.r.williams at swansea.ac.uk
> www.wvn.ac.uk
> 
> 
>