We saw something similar at our site video freezing up (incoming only) while the other side could see and hear us fine. It would last about 30-60 seconds at a time and happen every 3-5 minutes. After much multicast troubleshooting (and hair-pulling) it was found to be a CGMP issue on the Cisco 2924 & 3524 switches between our AGN and edge router. Once we found this and disabled CGMP snooping, our streams were uninterrupted for hours at a time.
Since then, we've replaced the 2924 and 3524 switches with 2950-series (IGMP-only) and have had great results. Regards, Steve Weidner, CCNA Network Analyst The University of South Dakota 605-677-6915 -----Original Message----- From: Mike Weaver [mailto:wea...@er.doe.gov] Sent: Monday, April 26, 2004 10:36 AM To: ag-t...@mcs.anl.gov Subject: [AG-TECH] Periodic freezing Has anyone experienced periodic freezing of video & audio for short periods of time (~1 minute) in one direction only? I'm currently in a 2 site, AG 2.x-only meeting and we see and hear the other site fine. Our video and audio seem fine to us, but periodically freeze as seen by the other site. vic & RAT show no loss, and the multicast beacon looks fine. We were originally in a secure session on the NCSA venue server, but moved to an open session on the ANL venue server to see if it was related to either the encryption or a particular venue server. No difference. Anyone ever see this and come up with a cause/fix? Ideas welcome! I'm getting heated questions from presidential appointees! Telling them that AG is a research project usually doesn't cut it. Also can't say that holding high-level, business meetings over a research network using a research application may not be the best idea. Thanks, Mike -- Mike Weaver Sr. Network Administrator SC-31/Germantown Building US Department of Energy 1000 Independence Avenue, SW Washington, D.C. 20585-1290 Voice: 301-903-0072 Fax: 301-528-2701 Email: wea...@er.doe.gov
