Good point Jason. I think the task is hinting at using Bi-directional PIM. Disabling the SPT switchover would force all the receivers downstream of the RP to stay on the RP tree (*, G). My only concern is if there is host between the RP and the Source. With SPT threshold set to zero, would the router between the source and RP still pull from the SPT?...haven't tested it, but might be something to look into.
On Sun, Jul 26, 2009 at 12:10 PM, jmangawang <[email protected]> wrote: > Ok, I'd just like a little clarification on another solution after > just having gone through this myself. > > My solution was to configure "ip pim spt-threshold infinity" on all > participating routers. When I did a "show ip mroute" while the MRM > test was running (from next task), I did not see any (S,G) entries, > only (*,G) entries except on the sender's table. On a whim, I removed > the "ip pim spt-threshold infinity" command from all routers, then > enabled "ip pim bidir-enable" on each, configured the RP to send out > bidir, and re-ran MRM. My "show ip mroute" tables looked identical > with the exception that every entry had "bidir" in it. > > And finally, I removed all instances of "bidir" and "spt-threshold" > and just ran everything normal, and the mroute tables DID show (S,G) > entries, like I'd expect them too. > > So, would the "ip pim spt-threshold infinity" command been an > acceptable solution for this? > > Thanks, > > Jason > > >Bryan Bartik > >Wed, 15 Jul 2009 04:03:01 -0700 > > > >Carlos, > > > >Take a look here, first paragraph: > > > > > http://www.cisco.com/en/US/docs/ios/12_1t/12_1t2/feature/guide/dtbipim.html#wp1054540 > > > >On Sat, Jul 11, 2009 at 3:17 PM, Carlos Valero <[email protected] > >wrote: > > > >> Sorry, but I have another question about Multicast > >> > >> In Task 5.2 of this Lab (Vol 3, lab 6) the requirements state: > >> > >> "Multicast Traffic should distributed exclusively on Shared Trees" > >> > >> > >> In the solution, BIDIR is enabled in all participating Routers: > >> > >> - ip pim bidir-enable > >> > >> But I'm not sure why. > >> > >> What part of these requirements "forces" us to use ip pim bidir-enable ? > >> > >> I guess it is not the fact we are using Shared Trees, right? > >> > >> I believe that we can have Sparse Mode using Unidirectional Shared > Trees, > >> correct? > >> > >> So is it the fact that says: "exclusively on Shared Trees" what makes us > >> use BIDIR? > >> > >> Could you please explain? > >> > >> > >> Thank you!! > _______________________________________________ > For more information regarding industry leading CCIE Lab training, please > visit www.ipexpert.com > -- Bryan Bartik CCIE #23707 (R&S), CCNP Sr. Support Engineer - IPexpert, Inc. URL: http://www.IPexpert.com
_______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com
