All things related to multicast

["Eric Gauthier" <>]

Hello,

A while back, I wrote a short how-to for narrowing down multicast problems
for AG people and added it to the AG Documentation archive at:
http://www.accessgrid.org/agdp/guide/looking_glass.html

That should help the end-site figure out, from Abilene's perspective, if its
some sort of filtering, mBGP, or MSDP issue.  Also, any feedback, comments,
flames, or praise on this would be very much appreciated...

Eric Gauthier
  Network Engineer
  617-353-8218 ~^~ 

Boston University - Office of IT


-----Original Message-----
From: Caren Litvanyi 
[mailto:]
 
Sent: Thursday, January 12, 2006 9:41 AM
To: Cory; bdr
Cc: 
;
 
;
 
;

Subject: Re: [Fwd: Bradley needs urgent help with AccessGrid]

As mentioned earlier, We're seeing no routes in inet.2 (multicast) from
Bradley.  I pulled the AS off that last mail, and I see everything from
Bradley has the path 22335 32698 26367.  So address-family multicast in BGP
needs to be checked between Bradley and PeoriaNEXT, and PeoriaNEXT and MREN.
After that's running, we'll look at MSDP.  Can someone give me a source addr
at Bradley for this multicast session and the group address?
Would also be nice to know the IP of an active receiver.
(I am wearing my Abilene hat here - I have no visibility into MREN.) Thanks,
Caren
------------
Caren Litvanyi, network engineer
Global Research NOC at Indiana University 

o:812-856-4576  c:720-839-7739


On Wed, 11 Jan 2006, David Farmer wrote:

> If I had to guess MSDP isn't setup quite correctly.  What RP addresss 
> are you using?
>
> The RP must put the sources into MSDP and uses the RP address to 
> originate the MSDP messages, which must properly RFP check in remote 
> ASes.
>
> Otherwise check with MREN, I remember something about the Force10 
> having some kind of Multicast bug.  I'm, not sure if it is still a 
> problem or if it was even related to these symptoms.
>
> On 11 Jan 2006 bdr wrote:
>
>> I'm trying to remember what's wrong with the border router ... I 
>> think it's a Cisco ... and advice for Cory?
>>
>> -------- Original Message --------
>> Subject:     Bradley needs urgent help with AccessGrid
>> Date:        Wed, 11 Jan 2006 17:51:15 -0600
>> From:        Rabe, Cory 
>> <>
>> To:  
>> <>
>> CC:  
>> <>,
>>  
>> <>
>>
>>
>>
>> We are having problems with AccessGrid here.  Our networking support has
been unsuccessful in finding a solution thus far.
>>
>>
>>
>> We ARE able to see and hear remote sites but they AREN'T able to see or
hear us.  Of course, when we switch to unicast the promlems go away...
>>
>> We are able to conference amongst each other on our campus but anything
going out doesn't get thru.
>>
>> We are going to start troubleshooting this at 8am.  If you could provide
us some assistance that would be great.  Let us know regardless.
>>
>> Thanks
>> Cory Rabe
>>
>>
>>
>>
>> --
>> Bob Riddle 
>> ()
>>     Technologist,Internet2
>> 3025 Boardwalk, Suite 100         Ann Arbor, Michigan  48108
>> Business Phone: 734.913.4257      Fax Number:  734.913.4255
>>
>> "Never be afraid to try something new.  Remember that amateurs built 
>> the Ark.  Professionals built the Titanic."  Dave Barry
>
> =================================================
> David Farmer                          Email:  
> 
> Office of Information Technology
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