Fwd: [AG-TECH] Re: [AG-USERS] UAMS Access Grid

[Jacob Jenkins]

Begin forwarded message:

> From: Jacob Jenkins <jmjenki2 at olemiss.edu>
> Date: Tue May 27, 2003  12:57:03 PM US/Central
> To: ag-tech at mcs.anl.gov
> Cc: Heather L Smith <SmithHeatherL at uams.edu>
> Subject: [AG-TECH] Re: [AG-USERS] UAMS Access Grid
>
> We recently had and solved a problem with the exact symptoms. The  
> problem was related to our not advertising MBGP routes. We had some  
> successful tests with sites in Mississippi but could not talk to  
> people outside the state.
> The problem was difficult because by default, Cisco routers translate  
> BGP routes into MBGP routes and as long as you are talking  
> Cisco-to-Cisco, there is no problem. Abilene, however, has a Juniper  
> router where we tie into them which does not do this. Since the  
> universities in Mississippi are tied into our own high speed network  
> (which uses Cisco routers exclusively, I believe) and we conducted all  
> of our preliminary testing with AG sites in Mississippi, we never  
> noticed we had a problem.
> So, make sure you are advertising MBGP routes. When we started doing  
> this, it was like turning on a light switch, things just started  
> working.
>
> On Tuesday, May 27, 2003, at 12:17 PM, Jennifer Teig von Hoffman wrote:
>
>> Sounds like a multicast problem to me too; a lot of us have  
>> experienced one-way multicast outages at one time or another.
>>
>> NLANR's multicast beacon can be a big help in tracking down the  
>> source of the multicast problem; there's detailed info about it at:
>>
>>    http://dast.nlanr.net/Projects/Beacon/
>>
>> - Jennifer
>>
>> Tom Coffin wrote:
>>
>>>
>>>
>>> Sounds like you have multicast problems with your network.
>>>
>>> First and foremost you need to engage your networking folks
>>> into trouble shooting that problem.
>>>
>>> Secondarily, you could use the bridging infastructure still
>>> supported by ANL by using vtc commands. Several of the
>>> virtual venues offer vtc support - This will bridge your
>>> sites into the multicast environment.
>>>
>>> A third method would be to create your own quickbridge.
>>> Info for that can be found in the AGDP
>>> http://www.accessgrid.org/agdp/
>>> http://www.accessgrid.org/agdp/howto/quickbridge/1.2/html/ 
>>> introduction.html
>>>
>>>
>>> _____________________________________________________
>>> At 11:25 AM 5/27/2003 -0500, Smith, Heather L wrote:
>>> >>>>
>>>
>>>
>>> Hi. I have a couple of requests from anyone who could help us.
>>>
>>>
>>>
>>>
>>> We have a BIG meeting with University of New Mexico next Monday and  
>>> we are having problems linking with them. We here at UAMS can see  
>>> and hear UNM, but they cannot see our video or hear our audio, but  
>>> we can communicate through the MUD and DPPT works with us as the  
>>> master and UNM as the client. We had this problem a couple of weeks  
>>> ago and tested with Argonne and University of Connecticut and things  
>>> went off without a hitch. So here's what I need:
>>>
>>>
>>>
>>> * Does anybody have any suggestions as to why this problem is  
>>> occurring?
>>> * Is there anybody that can meet in the testing room or some other  
>>> venue in order to test our Access Grid?
>>>
>>>
>>>
>>>
>>> Thanks for your help!
>>>
>>> Heather Smith
>>>
>>> Curriculum Support Liaison
>>>
>>> University of Arkansas for Medical Sciences
>>>
>>> Library Learning Resource Center
>>>
>>> 4301 W. Markham, # 586
>>>
>>> Little Rock, Arkansas 72205
>>>
>>> Phone: 501-686-8116
>>>
>>> Email: smithheatherl at uams.edu
>>>
>>>
>>>
>>>
>>> <<<<
>>>
>>>
>>>
>>>
>>>
>>>
>>> ___________________________________________________________
>>> Tom Coffin .......................... tcoffin at ncsa.uiuc.edu
>>
>>
>>
>>
>>
> Jacob Jenkins
> Network Administrator/Access Grid Node Operator
> Office of Research and Sponsored Programs
> The University of Mississippi
> (662) 915-7482
>
>
>
Jacob Jenkins
Network Administrator/Access Grid Node Operator
Office of Research and Sponsored Programs
The University of Mississippi
(662) 915-7482