Thanks Bob & marko you both are champ! yes its working with ip next hop! i will share further details after end to end testing.
Regards Sheraz > From: [email protected] > To: [email protected] > Date: Sun, 27 Jan 2013 00:33:19 +0500 > CC: [email protected] > Subject: Re: [OSL | CCIE_RS] neighbor default-originate > > Is it CCIE R&S or SP? > > If its R&S please include me as well & can you please share some material for > lab preparation of CCIE R&S i have to prepare my lab. > > Regards > Sheraz > > > From:[email protected] > > To: [email protected] > > Date: Sun, 27 Jan 2013 00:01:47 +0500 > > CC: [email protected] > > Subject: Re: [OSL | CCIE_RS] neighbor default-originate > > > > Dear Markoz, > > > > Then things have to deal according to the tasks of CCIE Exam... in this > > case you are right, one must have to perform the task like that if this is > > the case. > > > > Regards > > Sheraz > > > > > From: [email protected] > > > Date: Sat, 26 Jan 2013 10:19:22 -0800 > > > Subject: Re: [OSL | CCIE_RS] neighbor default-originate > > > To: [email protected] > > > CC: [email protected]; [email protected] > > > > > > Sheraz, > > > > > > I'm pretty sure Lukasz knew why he had an RPF failure. This is to be > > > expected in the lab and you need to be able to handle it > > > appropriately. Enabling PIM on all the interfaces may not be an option > > > (lab restrictions) and knowing how to recover from the RPF failure is > > > an essential skill for the multicast in the lab. > > > > > > Lukasz was trying to replicate this scenario: > > > http://blog.ipexpert.com/2010/12/29/multicast-rpf-failure-recovery-using-bgp/ > > > > > > -- > > > Marko Milivojevic - CCIE #18427 (SP R&S) > > > Senior CCIE Instructor / Managing Partner - IPexpert > > > > > > On Sat, Jan 26, 2013 at 9:24 AM, Sheraz Sheraz <[email protected]> wrote: > > > > Please read the below facts it will help you to understand that why RPF > > > > is being failed after disabling PIM on some interfaces. > > > > > > > > > > > > "When a multicast packet enters a router's interface, it will lookup the > > > > list of networks that are reachable via that input interface i.e., it > > > > checks the reverse path of the packet. If the router finds a matching > > > > routing entry for the source IP of the multicast packet, the RPF check > > > > passes and the packet is forwarded to all other interfaces that are > > > > participating in multicast for this multicast group. If the RPF check > > > > fails the packet will be dropped. As a result the forwarding of the > > > > packet is decided based upon the reverse path of the packet rather than > > > > the forward path. RPF routers only forward packets that come into the > > > > interface that also hold the routing entry for the source of the packet, > > > > thus breaking any loop" > > > > > > > > > > > > > > > >> From: [email protected] > > > >> To: [email protected]; [email protected] > > > >> Date: Sat, 26 Jan 2013 22:10:10 +0500 > > > >> Subject: Re: [OSL | CCIE_RS] neighbor default-originate > > > >> > > > >> Hi, > > > >> > > > >> I think BGP can help to work as base line for multicast traffic but > > > >> hence you need PIM as well. Although BGP it self needs baseline static > > > >> or IGP protocols to work properly! You migh have have to enable PIM > > > >> for multicast traffic to work through out the routing hops and and any > > > >> IGP! in my case i have enabled PIM with RP on my routers & Multi > > > >> layer switches as well & have never seen RPF or RP failure! multicast > > > >> works properly.EGP & IGP protocols are not the suitable choice since > > > >> "protocol independent Multicast" PIM has been designed for multicast > > > >> traffic.Look both BGP & IGP protocols takes decision on the base of > > > >> destination address while multicast needs source base decisions! the > > > >> nature and working nature of both dynamic protocols & multicast are > > > >> different. > > > >> > > > >> > > > >> "Multicast RPF, typically denoted simply as RPF, is used in > > > >> conjunction with a multicast routing protocols such as MSDP and PIM-SM > > > >> to ensure loop-free forwarding of multicast packets. In multicast > > > >> routing the decision to forward traffic is based upon source address > > > >> and > > > >> not on destination address as is the case with unicast routing. It > > > >> does > > > >> this by utilizing either a dedicated multicast routing table or > > > >> alternatively the router's native unicast routing table" > > > >> > > > >> > > > >> Regards > > > >> Sheraz > > > >> > > > >> > Date: Sat, 26 Jan 2013 00:55:13 +0000 > > > >> > From: [email protected] > > > >> > To: [email protected] > > > >> > Subject: [OSL | CCIE_RS] neighbor default-originate > > > >> > > > > >> > Hi All, > > > >> > > > > >> > > > > >> > I am just trying to replicate Marko scenario from blog Multicast RPF > > > >> > Failure: Recovery Using BGP. I have only changed addressing but other > > > >> > details are the same. I have ipv4 unicast working and Pim enabled. > > > >> > I have disabled pim between R3 and R4 on Fa interface and I can see > > > >> > RPF > > > >> > failure. I set up MP-BGP and that is active as well but..command > > > >> > neighbor x.x.x.x default-originate does not seem to send default > > > >> > route > > > >> > to the neighbor. > > > >> > > > > >> > > > > >> > R3 > > > >> > > > > >> > router bgp 34 > > > >> > no bgp default ipv4-unicast > > > >> > bgp log-neighbor-changes > > > >> > neighbor 4.4.4.4 remote-as 34 > > > >> > neighbor 4.4.4.4 update-source Loopback0 > > > >> > ! > > > >> > address-family ipv4 multicast > > > >> > neighbor 4.4.4.4 activate > > > >> > neighbor 4.4.4.4 default-originate > > > >> > no auto-summary > > > >> > > > > >> > > > > >> > R3#show bgp ipv4 multicast neighbors 4.4.4.4 | b def > > > >> > Default information originate, default not sent > > > >> > > > > >> > > > > >> > R4 > > > >> > > > > >> > > > > >> > router bgp 34 > > > >> > no bgp default ipv4-unicast > > > >> > bgp log-neighbor-changes > > > >> > neighbor 3.3.3.3 remote-as 34 > > > >> > neighbor 3.3.3.3 update-source Loopback0 > > > >> > ! > > > >> > address-family ipv4 multicast > > > >> > neighbor 3.3.3.3 activate > > > >> > no auto-summary > > > >> > no synchronization > > > >> > exit-address-family > > > >> > R4# > > > >> > R4#show bgp ipv4 mul > > > >> > > > > >> > > > > >> > R4#show bgp ipv4 mul s > > > >> > Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down > > > >> > State/PfxRcd > > > >> > 3.3.3.3 4 34 61 59 3 0 0 00:34:57 > > > >> > 0 > > > >> > > > > >> > > > > >> > I guess I misinterpret something. Where is the problem? > > > >> > > > > >> > > > > >> > THanks, > > > >> > > > > >> > > > > >> > _______________________________________________ > > > >> > For more information regarding industry leading CCIE Lab training, > > > >> > please visit www.ipexpert.com > > > >> > > > > >> > Are you a CCNP or CCIE and looking for a job? Check out > > > >> > www.PlatinumPlacement.com > > > >> > > > > >> > http://onlinestudylist.com/mailman/listinfo/ccie_rs > > > >> > > > >> _______________________________________________ > > > >> For more information regarding industry leading CCIE Lab training, > > > >> please visit www.ipexpert.com > > > >> > > > >> Are you a CCNP or CCIE and looking for a job? Check out > > > >> www.PlatinumPlacement.com > > > >> > > > >> http://onlinestudylist.com/mailman/listinfo/ccie_rs > > > > > > > > _______________________________________________ > > > > For more information regarding industry leading CCIE Lab training, > > > > please visit www.ipexpert.com > > > > > > > > Are you a CCNP or CCIE and looking for a job? Check out > > > > www.PlatinumPlacement.com > > > > > > > > http://onlinestudylist.com/mailman/listinfo/ccie_rs > > > > _______________________________________________ > > For more information regarding industry leading CCIE Lab training, please > > visit www.ipexpert.com > > > > Are you a CCNP or CCIE and looking for a job? Check out > > www.PlatinumPlacement.com > > > > http://onlinestudylist.com/mailman/listinfo/ccie_rs > > _______________________________________________ > For more information regarding industry leading CCIE Lab training, please > visit www.ipexpert.com > > Are you a CCNP or CCIE and looking for a job? Check out > www.PlatinumPlacement.com > > http://onlinestudylist.com/mailman/listinfo/ccie_rs _______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com Are you a CCNP or CCIE and looking for a job? Check out www.PlatinumPlacement.com http://onlinestudylist.com/mailman/listinfo/ccie_rs
