Hi Joe, Thanks for your reply!
As far as I can see, in IGMPv1, the router elected as DR (lowest metric, then highest IP), will become the querier as well. In IGMPv2 it is the lowest IP address. After all that, no matter what, the DR (again, lowest metric, highest IP), will be the forwarder for any MA. I hope this is correctly understood? Sincerely, Kim Pedersen On Sat, May 23, 2009 at 10:58 PM, Joe Astorino <[email protected]>wrote: > Kim, I also wanted to note that the PIM DR and the PIM Assert message do > different things -- The DR is elected to handle all the IGMP related > processes, whereas the winner of the assert process is the designated > forwarder, responsible for forwarding the actual multicast traffic on to the > segment. So remember, 2 totally different elections, 2 totally different > things, they just sound very similar! > > > > > Regards, > > Joe Astorino > CCIE #24347 (R&S) > Sr. Support Engineer – IPexpert, Inc. > URL: http://www.IPexpert.com <http://www.ipexpert.com/> > > > > ------------------------------ > *From:* Joe Astorino [mailto:[email protected]] > *Sent:* Saturday, May 23, 2009 3:59 PM > *To:* 'Kim Pedersen'; [email protected] > *Subject:* RE: [OSL | CCIE_RS] Fwd: DR and Assert. > > Hey Kim, > > PIM-SM does use the assert messages as well, just the same as PIM-DM does. > If you have the CCIE R/S exam cert guide v3 , check out page 609 > "similarities between PIM-DM and PIM-SM" > > > Regards, > > Joe Astorino > CCIE #24347 (R&S) > Sr. Support Engineer – IPexpert, Inc. > URL: http://www.IPexpert.com <http://www.ipexpert.com/> > > > > ------------------------------ > *From:* [email protected] [mailto: > [email protected]] *On Behalf Of *Kim Pedersen > *Sent:* Saturday, May 23, 2009 12:30 PM > *To:* [email protected] > *Subject:* [OSL | CCIE_RS] Fwd: DR and Assert. > > Hi, > > Dont know what happened, but now they are behaving the way they should.. > When IGMPv2 is used, they use the lowest IP address.. When IGMPv1 is used, > the one that becomes DR will become the querier as well... *shrug* > > But im still not clear about whether or not pim-sm uses any sort of > assert messages to figure out which one should send the explicit join to the > RP, and thereby forward traffic to the LAN. > > Thanks, > > Sincerly, > Kim Pedersen > > On Sat, May 23, 2009 at 5:03 PM, prakash patel > <[email protected]>wrote: > >> Please explain me the topology >> >> thx >> ------------------------------ >> From: [email protected] >> To: [email protected] >> Subject: Re: [OSL | CCIE_RS] DR and Assert. >> Date: Sat, 23 May 2009 16:33:35 +0200 >> CC: [email protected] >> >> >> Hi there, >> >> Nope, didnt touch the priority. Only manually asked it to use igmp v1 and >> therefor expected it to use the pim election to use the dr and be querier. >> >> Thanks, >> Kim Pedersen >> >> Sent from my iPhone >> >> On 23/05/2009, at 15.52, prakash patel <[email protected]> wrote: >> >> Quick hint : did you configure ip pim dr-priority command ? >> >> thanks >> >> >> >> ------------------------------ >> Date: Sat, 23 May 2009 12:07:36 +0200 >> From: <[email protected]>[email protected] >> To: <[email protected]>[email protected] >> Subject: [OSL | CCIE_RS] DR and Assert. >> >> Hi All, >> >> I am trying to tackle my enemy number 1... Multicast. I am a bit >> confused about when two routers are connected to the same multiaccess >> network. >> As far as I understand it, when using PIM-DM, an assert message is being >> sent out, with the metric (AD + metric) of each router. The one with the >> best metric wins, in case of a tie, the router with the highest IP wins. >> >> Then later on in the material, in the description of PIM-SM, it says it >> elects a DR, based solely on the highest IP address. This one will be the >> one that sends a join up the tree towards the RP. >> >> Are assert messages not used in PIM-SM at all? and I know from the >> material that a DR is still being elected in PIM-DM, but it should only be >> used when IGMPv1 is being used to select the current querier. >> >> Is this correctly understood? >> >> Also, I have tried a pure PIM-DM network, and used IGMPv1 on my >> multiaccess-network towards the receiver. However, what happens is that both >> routers end up sending queriers onto the network, and not the DR elected >> router as I expected. >> >> All in all, a bit confused :) >> >> Sincerely, >> Kim Pedersen >> >> -- >> // Freedom Matters >> >> >> ------------------------------ >> Hotmail® has a new way to see what's up with your friends. Check it >> out.<http://windowslive.com/Tutorial/Hotmail/WhatsNew?ocid=TXT_TAGLM_WL_HM_Tutorial_WhatsNew1_052009> >> >> >> ------------------------------ >> Hotmail® has ever-growing storage! Don’t worry about storage limits. Check >> it >> out.<http://windowslive.com/Tutorial/Hotmail/Storage?ocid=TXT_TAGLM_WL_HM_Tutorial_Storage1_052009> >> > > > > -- > // Freedom Matters > > > > > -- > // Freedom Matters > > No virus found in this incoming message. > Checked by AVG - www.avg.com > Version: 8.5.339 / Virus Database: 270.12.31/2116 - Release Date: 05/23/09 > 07:00:00 > > No virus found in this incoming message. > Checked by AVG - www.avg.com > Version: 8.5.339 / Virus Database: 270.12.31/2116 - Release Date: 05/23/09 > 07:00:00 > -- // Freedom Matters
