From: Brian McGahan (bmcgahan@internetworkexpert.com)
Date: Wed Aug 22 2007 - 16:04:51 ART
Cisco routers by default will listen for mapping agent messages
going to (*,224.0.1.40). All (*,G) in sparse mode is rooted at the RP.
(*,224.0.1.40) is rooted at the RP in this case because a static RP was
configured. Only (S,G) can be rooted at the source, in the case of SSM or
SPT recalculation from a tree rooted at the RP.
HTH,
Brian McGahan, CCIE #8593 (R&S/SP/Security)
bmcgahan@internetworkexpert.com
Internetwork Expert, Inc.
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> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Toh Soon, Lim
> Sent: Wednesday, August 22, 2007 1:18 PM
> To: Sadiq Yakasai
> Cc: Cisco certification
> Subject: Re: (*, 224.0.1.40) entry for a static RP
>
> Hi Sadiq,
>
> AFAIK, 224.0.1.40 is the reserved Cisco-RP-Discovery address. It is the
> address to which the Auto-RP mapping agent sends the list of group-to-RP
> mappings in RP-Discovery messages to the PIM-SM domain. All PIM-SM routers
> listen for this address.
>
> Can anyone provide a more detailed explanation, especially why this mroute
> entry is rooted at the static RP that we define?
>
>
> Thank you.
>
> B.Rgds,
> Lim TS
>
>
> On 8/22/07, Sadiq Yakasai <sadiqtanko@gmail.com> wrote:
> >
> > Hi guys,
> >
> > Please can someone clarify a confusion I have got here.
> >
> > I configured a static RP entry for a mcast network, and I am seeing
> > the RP to groups mapping information through out the MCast network. Is
> > this normal behaviour please?
> >
> > I was expecting not to see this since I am not using any auto group to
> > RP mapping, nor using a mapping agent to dissiminate the RP
> > information throughout the MCast routing domain.
> >
> > here is an excerp from my config please:
> >
> >
> > (*, 228.28.28.28), 00:09:59/00:02:11, RP 150.1.2.2, flags: SJCL
> > Incoming interface: GigabitEthernet0/1, RPF nbr 132.1.17.1
> > Outgoing interface list:
> > Vlan783, Forward/Sparse, 00:09:59/00:02:11
> >
> > (*, 224.0.1.40), 00:09:59/00:02:30, RP 150.1.2.2, flags: SJPCL
> > Incoming interface: GigabitEthernet0/1, RPF nbr 132.1.17.1
> > Outgoing interface list: Null
> >
> > SW1#sh run | i pim
> > ip pim sparse-mode
> > ip pim sparse-mode
> > ip pim rp-address 150.1.2.2
> >
> >
> > Any comments wld b appreciated please.
> >
> > Thanks
> >
> > Sadiq
> >
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