Hi Chris > Someone tell me I'm just having a bad week!
You're having a bad day. > from a different manufacturer, the chances are that multicast > doesn't work until someone complains that it isn't working. I think this is an interesting line and shadows our experience. With the increase in real-time traffic the tendency of many sites' admins to just do a 'quick fix' which may reload a router/switch/firewall(!) or drop a link for a few seconds is having a greater impact - as voice/video calls are being dropped. Of course the old web/mail traffic doesn't care. Same applies with longer fixes/kit changes - but no thorough check of whether the network is completely back up. There may be a need for education here in that site admins need to be more aware that they no longer can do the little 're-jigs' with the network - or at least they need to check what is going on first. Maybe there should be a longer checklist for after re-jigs. Changing from: Ping OK / Not OK Web page OK / Not OK Which seems to be common, to: IPv4 Ping OK / Not OK IPv6 Ping OK / Not OK Multicast beacon OK / Not OK etc It would be interesting for people who have kit combinations running to share them. E.g. we run PIM through Cisco<->Riverstone<->Riverstone<->Cisco but MSDP only Cisco to Cisco - hops over the Riverstones. That works OK for us at the moment, but I am getting high CPU on Cisco 7206 = +20% per 8Mbps multicast stream. Cheers Steve ------------------------------------------------------------- Steve Williams Video Network Manager University of Wales Swansea Singleton Park Swansea SA2 8PP +44 (0)1792 295167 s.r.willi...@swansea.ac.uk www.wvn.ac.uk > -----Original Message----- > From: Osland, CD (Chris) [mailto:c.d.osl...@rl.ac.uk] > Sent: 25 June 2004 09:57 > To: ag-t...@mcs.anl.gov > Subject: [AG-TECH] Multicast > > Is it just me, or is the worldwide 'uptime' of multicast > actually going down at present? Or is this a UK-only > observation? Or am I paranoid and there are just more people > using AG, and therefore chatting on ag-tech, than before? > > The problems I sense are that more suppliers are now in the > market and the interoperability between manufacturers is > decreasing, so when a site changes a router, especially to one > from a different manufacturer, the chances are that multicast > doesn't work until someone complains that it isn't working. > As a result there are an increasing number of local problems > (compounded by the usual one of finding anyone who knows > anything concrete about multicast at a given site) rather than > a global cause, but the result is an increasing global problem. > > Someone tell me I'm just having a bad week!> > Cheers > > Chris > > ____________________________________________________________________ > Chris Osland Office tel: +44 > (0) 1235 446565 > Digital Media and Access Grid Medialab tel: +44 > (0) > 1235 446459 > BIT Department Access Grid room tel: > +44 > (0) 1235 445666 > e-mail: c.d.osl...@rl.ac.uk Fax: > +44 > (0) 1235 445597 > CCLRC Rutherford Appleton Laboratory (Bldg. R18) > Chilton, DIDCOT, Oxon OX11 0QX, UK > [The contents of this email are confidential and are for the use of the > intended recipient only. > If you are not the intended recipient do not take any action on it or show > it to anyone else, > but return this email to the sender and delete your copy of it.] > > > > > > > -----Original Message----- > > From: owner-ag-t...@mcs.anl.gov [mailto:owner-ag-t...@mcs.anl.gov]On > > Behalf Of Ivan R. Judson > > Sent: 24 June 2004 16:31 > > To: ag-t...@mcs.anl.gov > > Subject: [AG-TECH] TVS being rebooted > > > > > > > > > > We're rebooting the TVS, as soon as it's back we'll restart > > the Venue Server > > so meetings can continue. > > > > We're sorry for the interruption. > > > > --Ivan > >
