[AG-TECH] All client in same venue use same bridge?

John I. Quebedeaux, Jr johnq at lsu.edu
Fri Jul 30 12:04:20 CDT 2010


It's simple reason why this is the case: If two bridges do not have
multicast connectivity between them, then the traffic between the two
bridges can not reach each other.

On the same bridge, you can be sure everyone is connected to the same
traffic; but, if on different bridges - currently there is no way to be sure
that the multicast traffic reaches between bridges without testing.

Currently, there is no way without just testing which bridges do this - and
sometimes the networks change between sites that multicast breaks and until
reported isn't fixed.

For an event, I will typically (if required) suggest which bridge sites
should utilize if they aren't multicast capable that I know can work between
bridges. *most* of our sites here are now multicast enabled however, so we
try not to rely on bridges at all.

note: be sensitive to using other people's bridges because that will incur
extra traffic on their network (if for large # of clients and bandwidth,
this could be a problem for some sites hosting bridges without them
realizing it).

We have 'internal' bridges in our state where we have our own registry that
we only give out to our Louisiana site nodes so they only show up for our
clients. Very useful way to take advantage of the registry feature.

-John Q.
John I. Quebedeaux, Jr.; Louisiana State University
Computer Manager LBRN; 131 Life Sciences Bldg.
e-mail: johnq at lsu.edu; web: http://lbrn.lsu.edu
phone: 225-578-0062 / fax: 225-578-2597

> From: Sangil Choi <sichoi at netmedia.gist.ac.kr>
> Date: Fri, 30 Jul 2010 19:39:42 +0900
> To: "ag-tech at mcs.anl.gov" <ag-tech at mcs.anl.gov>
> Subject: [AG-TECH]  All client in same venue use same bridge?
> Hi everyone,
> I've problem about bridge.
> I installed 'AGTk3.2 beta 1' on three nodes and includes that as one venue.
> In that case, I found the problem about communicate each others.
> If the nodes connect with same bridge, the node can find other node's
> information in RAT and vic.
> In other case, nodes connect with different bridges to communicate each other,
> there are no RAT and vic information of other nodes.
> If one node uses bridge and others use multicast, bridge connected node can
> find multicast node's information in RAT and vic.
> Could you tell me about reason about this?
> This problem occurs from our mistake?
> Regards,
> Sangil Choi.
> p.s : Used bridge is not ours and other bridge works as same problem.

More information about the ag-tech mailing list