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<TITLE>RE: [AG-TECH] Testing multicast connectivity...</TITLE>
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<P><FONT SIZE=2>I've seen similar problems at multiple sites for various reasons, one that hasn't been mentioned though, (aside from you checking YOUR lists, which you've already done) is to verify that no connected to you (i.e. your provider) isn't filtering any of the routes prior to delivery. The problem may also lie not in the route advertisements themselves, but MSDP source filtering from remote networks. Be wary when any access list between a necessary source and your receivers gets modified!</FONT></P>
<P><FONT SIZE=2>-----Original Message-----</FONT>
<BR><FONT SIZE=2>From: Richard Coffey [<A HREF="mailto:richardc@cs.utah.edu">mailto:richardc@cs.utah.edu</A>] </FONT>
<BR><FONT SIZE=2>Sent: Tuesday, May 20, 2003 11:00 PM</FONT>
<BR><FONT SIZE=2>To: Bill Nickless</FONT>
<BR><FONT SIZE=2>Cc: ag-tech@mcs.anl.gov; Mitch Kutzko</FONT>
<BR><FONT SIZE=2>Subject: Re: [AG-TECH] Testing multicast connectivity...</FONT>
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<P><FONT SIZE=2>I was referring to both problems. The Cisco bug might be a problem as well,</FONT>
<BR><FONT SIZE=2>but I think most of our core routers have been upgrade beyond this problem.</FONT>
<BR><FONT SIZE=2>I'll check with our NOCC on the IOS revs.</FONT>
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<P><FONT SIZE=2>Thanks Bill and Mitch!</FONT>
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<P><FONT SIZE=2>-Richard</FONT>
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<BR>
<P><FONT SIZE=2>On 5/20/03 8:24 PM, "Bill Nickless" <nickless@mcs.anl.gov> wrote:</FONT>
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<P><FONT SIZE=2>> Ah, this is a different problem. I thought you were talking about the</FONT>
<BR><FONT SIZE=2>> beacon traffic not being heard by other beacons. Now I understand you're</FONT>
<BR><FONT SIZE=2>> talking about your beacon crashing from time to time (or one of the three</FONT>
<BR><FONT SIZE=2>> threads).</FONT>
<BR><FONT SIZE=2>> </FONT>
<BR><FONT SIZE=2>> Mitch Kutzko <mitch@ncsa.uiuc.edu> has a slightly modified version of the</FONT>
<BR><FONT SIZE=2>> beacon code, with larger pre-compiled constant buffers. I'm not sure if</FONT>
<BR><FONT SIZE=2>> Mitch thinks it's ready for prime time yet. I've copied him on this</FONT>
<BR><FONT SIZE=2>> note--Mitch, is it ready for distribution?</FONT>
<BR><FONT SIZE=2>> </FONT>
<BR><FONT SIZE=2>> At 05:12 PM 5/20/2003 -0600, Richard Coffey wrote:</FONT>
<BR><FONT SIZE=2>>> Hi Bill,</FONT>
<BR><FONT SIZE=2>>> </FONT>
<BR><FONT SIZE=2>>> Avtwo.cs.utah.edu is the beacon is question. Every once and a while, Java</FONT>
<BR><FONT SIZE=2>>> throws and exception and kills the connection. Thoughts on that?</FONT>
<BR><FONT SIZE=2>>> </FONT>
<BR><FONT SIZE=2>>> -Richard</FONT>
<BR><FONT SIZE=2>>> </FONT>
<BR><FONT SIZE=2>>> On 5/20/03 4:15 PM, "Bill Nickless" <nickless@mcs.anl.gov> wrote:</FONT>
<BR><FONT SIZE=2>>> </FONT>
<BR><FONT SIZE=2>>>> This is consistent with an old bug in Cisco IOS prior to 12.0(10). If the</FONT>
<BR><FONT SIZE=2>>>> router directly connected to the source is running an earlier version, then</FONT>
<BR><FONT SIZE=2>>>> the behavior you mention below is possible.</FONT>
<BR><FONT SIZE=2>>>> </FONT>
<BR><FONT SIZE=2>>>> What specific beacon sources are you referring to?</FONT>
<BR><FONT SIZE=2>>>> </FONT>
<BR><FONT SIZE=2>>>> At 03:57 PM 5/20/2003 -0600, Richard Coffey wrote:</FONT>
<BR><FONT SIZE=2>>>>> Hi all,</FONT>
<BR><FONT SIZE=2>>>>> </FONT>
<BR><FONT SIZE=2>>>>> As of late, I've noticed problems with individual multicast addresses</FONT>
<BR><FONT SIZE=2>>>>> working. The beaconserver's address seems to indicate that we cannot send,</FONT>
<BR><FONT SIZE=2>>>>> yet I've gone into the test room and successfully collaborated. Also,</FONT>
<BR><FONT SIZE=2>>> people</FONT>
<BR><FONT SIZE=2>>>>> cannot see me in a particular room, but in other rooms they can, and vice</FONT>
<BR><FONT SIZE=2>>>>> versa.</FONT>
<BR><FONT SIZE=2>>>>> </FONT>
<BR><FONT SIZE=2>>>>> We're not running tight ACL's on our routers, so it's not that. Thoughts?</FONT>
<BR><FONT SIZE=2>>>>> </FONT>
<BR><FONT SIZE=2>>>>> -Richard</FONT>
<BR><FONT SIZE=2>>>>> </FONT>
<BR><FONT SIZE=2>>>>> --</FONT>
<BR><FONT SIZE=2>>>>> Richard C., SCI Evangelist</FONT>
<BR><FONT SIZE=2>>>>> SCI Institute</FONT>
<BR><FONT SIZE=2>>>>> University of Utah</FONT>
<BR><FONT SIZE=2>>>>> <A HREF="http://www.sci.utah.edu/" TARGET="_blank">http://www.sci.utah.edu/</A></FONT>
<BR><FONT SIZE=2>>>>> 801.918.5050</FONT>
<BR><FONT SIZE=2>>>>> 801.585.6513 fax</FONT>
<BR><FONT SIZE=2>>>> </FONT>
<BR><FONT SIZE=2>>>> ===</FONT>
<BR><FONT SIZE=2>>>> Bill Nickless <A HREF="http://www.mcs.anl.gov/people/nickless" TARGET="_blank">http://www.mcs.anl.gov/people/nickless</A> +1 630 252</FONT>
<BR><FONT SIZE=2>>> 7390</FONT>
<BR><FONT SIZE=2>>>> PGP:0E 0F 16 80 C5 B1 69 52 E1 44 1A A5 0E 1B 74</FONT>
<BR><FONT SIZE=2>>> F7 nickless@mcs.anl.gov</FONT>
<BR><FONT SIZE=2>>>> </FONT>
<BR><FONT SIZE=2>>>> </FONT>
<BR><FONT SIZE=2>> </FONT>
<BR><FONT SIZE=2>> ===</FONT>
<BR><FONT SIZE=2>> Bill Nickless <A HREF="http://www.mcs.anl.gov/people/nickless" TARGET="_blank">http://www.mcs.anl.gov/people/nickless</A> +1 630 252 7390</FONT>
<BR><FONT SIZE=2>> PGP:0E 0F 16 80 C5 B1 69 52 E1 44 1A A5 0E 1B 74 F7 nickless@mcs.anl.gov</FONT>
<BR><FONT SIZE=2>> </FONT>
<BR><FONT SIZE=2>> </FONT>
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