Brian, your thought was correct. I just tested this using 4 routers in a string: R1 - R2 - R3 - R4
R1 is the mrm sender, R2 is the mrm manager, R3 is the RP/mapping agent, R4 is the mrm receiver. With the "ip pim spt-threshold infinity" option set, R4 only showed the (*,G) mroute entries, but R1, R2, and R3 all showed (S,G) mroute entries with R1 as sender. But with bidirectional PIM, all 4 routers only show (*,G) mroute entries. Without bidirectional or spt-threshold infinity, all 4 routers show (S,G) mroute entries. On Sun, Jul 26, 2009 at 2:44 PM, Bryan Bartik<[email protected]> wrote: > 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? _______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com
