Hi Mike, Normally MSDP will work with just unicast BGP, but then RPF check changed between IOS and IOS XR...
In IOS a router performing an RPF check looks first at the multicast routing table, and if it doesn't find a match it then looks at the unicast table. In IOS XR if you have any routes in the multicast table, and you do not find the one you are looking for, RPF fails. Doesn't matter whether or not the prefix is in the unicast table. You may have a situation where you are given multicast feeds (e.g. IPTV) and are only supplied with multicast BGP routes because they do not want any of your unicast traffic. You may well wish to receive those feeds, and also receive multicasts from sources which only advertises unicast routes. If I understand the RPF correctly, this presents you with a problem and may have to look at statics/ACLs etc. Paul. Mike Louis wrote: > This has been a confusing subject for me. If you enabled msdp between 2 pim > sm domains and enabled mc routing on the intermediate bgp routers while using > normal non-mbgp routing wouldn't mc still work? Why would you want to use > mbgp unless you wanted mc routes to take a different path than unicast > routes? Do most sp these days support mc in their networks for customers? > > Thanks > > mike > > -----Original Message----- > From: Jeff Tantsura <[EMAIL PROTECTED]> > Sent: Monday, September 01, 2008 4:53 AM > To: 'Muarwi' <[EMAIL PROTECTED]>; [email protected] > <[email protected]> > Subject: Re: [c-nsp] Interdomain Multicast Routing > > > Hi, > > The combination you've described has been working for many years, > very well tested, supported by all major vendors. > PIM (bidir as well) is used for intradomain multicast routing independently > of interdomain multicast (MSDP/MBGP). > Cisco does support PIM Bidir > > Cheers, > Jeff > > P.S. Best book ever - "Interdomain Mutlicast Routing" by > Edwards/Giuliano/Wright > >> -----Original Message----- >> From: [EMAIL PROTECTED] [mailto:cisco-nsp- >> [EMAIL PROTECTED] On Behalf Of Muarwi >> Sent: maandag 1 september 2008 9:49 >> To: [email protected] >> Subject: [c-nsp] Interdomain Multicast Routing >> >> Hi guys, I'm sorry if my questions is rather out of cisco's things. >> >> I've read books about interdomain multicast routing (also one from cisco >> press). From what I get, the solutions offered is PIM SM - MBGP - MSDP. >> >> My questions is : >> 1. what about using PIM Bidir for interdomain multicast? Is it possible to >> implement it in Cisco? >> 2. Has BGMP been being implemented in vendors? >> >> Thanks a lot for your response >> _______________________________________________ >> cisco-nsp mailing list [email protected] >> https://puck.nether.net/mailman/listinfo/cisco-nsp >> archive at http://puck.nether.net/pipermail/cisco-nsp/ > > _______________________________________________ > cisco-nsp mailing list [email protected] > https://puck.nether.net/mailman/listinfo/cisco-nsp > archive at http://puck.nether.net/pipermail/cisco-nsp/ > > > Note: This message and any attachments is intended solely for the use of the > individual or entity to which it is addressed and may contain information > that is non-public, proprietary, legally privileged, confidential, and/or > exempt from disclosure. If you are not the intended recipient, you are > hereby notified that any use, dissemination, distribution, or copying of this > communication is strictly prohibited. If you have received this > communication in error, please notify the original sender immediately by > telephone or return email and destroy or delete this message along with any > attachments immediately. > > _______________________________________________ > cisco-nsp mailing list [email protected] > https://puck.nether.net/mailman/listinfo/cisco-nsp > archive at http://puck.nether.net/pipermail/cisco-nsp/ > -- HEAnet Limited Ireland's Education & Research Network 5 George's Dock, IFSC, Dublin 1, Ireland Tel: +353.1.6609040 Web: http://www.heanet.ie Company registered in Ireland: 275301 Please consider the environment before printing this e-mail. _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
