ip pim dr-priority (Multicast)

March 28, 2008 @ 5:09 am · Filed under CCIE Study

It is important to know which one is DR. That is true. But it doesn’t have to be the same as the HSRP master, as long as both R1 and R2 have the same connectivity to the rest of the outside world. You could perfectly run HSRP master on R1 and all unicast would leave via R1, and use R2 path for multicast (because R2 is the DR of MC).
Geert ________________________________________ From: nobody@groupstudy.com [nobody@groupstudy.com] On Behalf Of Manuel Mindez Cano [Manuel.Mendez@telindus.es] Sent: 27 March 2008 11:43 To: WorkerBee; Saptanshu Cc: Group Study; Group Study Subject: RE: ip pim dr-priority (Multicast)
Typically you can find an environment with HSRP where you have to fix the DR as the same that the active router:
| | | | R1 R2 | | —————–
Hsrp active 192.168.1.1 (r1) Hsrp standby 192.168.1.2 (r2)
Pim DR –> high IP –> 192.168.1.2 –> problems
So, it’s important to know witch is the DR.
Regards
Manuel.
—–Mensaje original—– De: nobody@groupstudy.com [mailto:nobody@groupstudy.com] En nombre de WorkerBee Enviado el: jueves, 27 de marzo de 2008 9:55 Para: Saptanshu CC: Group Study; Group Study Asunto: Re: ip pim dr-priority (Multicast)
To select one of the many PIM routers in the same broadcast domain to response to IGMP join/leave messages.
PIM DR is also responsible to poll the existing multicast groups for any members still interested to continue receiving the multicast feeds.
In PIM sparse-mode, the receiver DR sends PIM join (towards RPF neighbor) and PIM prune messages from the receiver network toward the RP.
The source DR sends PIM register messages from the source network to the RP.
HTH
On Thu, Mar 27, 2008 at 3:15 PM, Saptanshu wrote: > Hi, > > I want to know what is the significance of ip pim dr-priority in Multicasting? > > This DR election happens for which all network types and how is it relevant for multicast traffic traversing through the multicast domain. > > Regards > Sap > > > > ——————————— > Never miss a thing. Make Yahoo your homepage. > > _______________________________________________________________________ > Subscription information may be found at: > http://www.groupstudy.com/list/CCIELab.html