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
