ha. you're not the only one. Took our my books last night to start reading on this. The road to written v5 could be a long one
:) Good luck all with your studies. B > From: [email protected] > Date: Wed, 8 Jan 2014 08:33:09 -0500 > To: [email protected] > CC: [email protected] > Subject: Re: [OSL | CCIE_RS] Multicast question > > Aaaaaand it's official: I've forgotten *everything* related multicast since > my pass :-( > > They always say you're not half-pregnant with multicast -- you either work > with it every day, or never. I'm in the "never" camp... > > Bob > -- > Sent from my iPhone, please excuse any typos. > > > On Jan 7, 2014, at 6:01 PM, Tony Singh <[email protected]> wrote: > > > > > > MSDP and MBGP (multicast BGP) are independent of each other but required > > for inter-domain multicast, MSDP enables PIM-SM domain RP's to share source > > information via sa-cache messages (S,G) via a TCP connection to each other, > > the cases where you wouldn't use MBGP with MSDP would be an anycast > > implementation via some IGP domains > > > > MSDP control-plane RPF checks are ignored if we have just two peers, if we > > have more then two peers then the originator-id is checked to ensure its > > own RP address is not originating the message in which case it would fail > > (if no originator-id is selected then preference is given to the loopbacks) > > > > If you get a question where a restriction of not changing IGP AD/metric or > > static mroute is imposed and IF the topology permits it then create a MBGP > > peer to originate the source of the multicast feed and also the RP address, > > this way you can route around the RPF failure. > > > > Order of preference for RPF checks are as follows: > > > > Static mroutes > > DVMRP routes > > MBGP routes > > Unicast routes > > > > So as you can see MBGP routes are preferred for RPF over unicast, you still > > need to ensure PIM is enabled on the relevant data-planes for this to work! > > > > -- > > BR > > > > Tony > > > > Sent from my iPad > > > >> On 7 Jan 2014, at 20:08, "Ryanlk18 ." <[email protected]> wrote: > >> > >> You can use MPBGP multicast address-family to carry source information > >> across the network to the RP. This can be useful in dealing with RPF > >> issues where static mroutes won't work or you cannot manipulate the > >> underlying routing protocol. > >> > >> MSDP is used to connect RPs together across multicast domains. This is > >> needed when you have multiple multicast domains that need to be connected > >> in order to share multicast feeds across the network. > >> > >> It could be possible to peer MSDP through a GRE Tunnel, but I've always > >> used MSDP and MPBGP together as they are both necessary to carry the source > >> and RP information to bridge the domains. > >> > >> V/r, > >> > >> Ryan Krcelic > >> > >> > >> > >>> On Tue, Jan 7, 2014 at 2:31 PM, Andrew LaPorte <[email protected]> wrote: > >>> > >>> I'm going to try to help out here a bit. > >>> > >>> BGP and MSDP are not directly related to one another. You can have MSDP > >>> without having BGP but it is typical to have BGP and Multicast as that is > >>> a > >>> larger environment. > >>> > >>> MSDP simply allows one RP to exchange multicast information with another > >>> RP, > >>> i.e. source A can register with RP A then another source B can register > >>> with > >>> RP B. If RP A and RP B have MSDP between them then both with know about > >>> source A and source B. > >>> > >>> Now if you want a client to be able to get to both source A and source B > >>> they must have a route that passes an RFP check. This is where BGP or OSPF > >>> or EIGRP would come in typically. > >>> > >>> Hope this helps. > >>> > >>> AndyL > >>> > >>> > >>> -----Original Message----- > >>> From: [email protected] > >>> [mailto:[email protected]] On Behalf Of Ryan Jensen > >>> Sent: Tuesday, January 7, 2014 1:47 PM > >>> To: [email protected] > >>> Subject: [OSL | CCIE_RS] Multicast question > >>> > >>> I all, this is probably an amateur question, but I'm having an issue > >>> wrapping my head around how BGP for multicast relates to MSDP. > >>> Here's how I Think they relate: > >>> BGP for multicast shares routes to RPs for the purpose of RPF MSDP shares > >>> 'routes' to multicast sources. > >>> > >>> The sources that are shared via MSDP need to be reachable via the routes > >>> learned from BGP yes? > >>> > >>> Is this a correct understanding? > >>> _______________________________________________ > >>> Free CCIE R&S, Collaboration, Data Center, Wireless & Security Videos :: > >>> > >>> iPexpert on YouTube: www.youtube.com/ipexpertinc > >>> > >>> _______________________________________________ > >>> Free CCIE R&S, Collaboration, Data Center, Wireless & Security Videos :: > >>> > >>> iPexpert on YouTube: www.youtube.com/ipexpertinc > >> _______________________________________________ > >> Free CCIE R&S, Collaboration, Data Center, Wireless & Security Videos :: > >> > >> iPexpert on YouTube: www.youtube.com/ipexpertinc > > _______________________________________________ > > Free CCIE R&S, Collaboration, Data Center, Wireless & Security Videos :: > > > > iPexpert on YouTube: www.youtube.com/ipexpertinc > _______________________________________________ > Free CCIE R&S, Collaboration, Data Center, Wireless & Security Videos :: > > iPexpert on YouTube: www.youtube.com/ipexpertinc _______________________________________________ Free CCIE R&S, Collaboration, Data Center, Wireless & Security Videos :: iPexpert on YouTube: www.youtube.com/ipexpertinc
