From: radha rani (radhaccie@xxxxxxxxxxx)
Date: Mon Nov 06 2000 - 18:27:10 GMT-3
When you configure ip pim-dense and ip pim-nbma mode together on a FR int,
the router generates a warning that this combination is not recommended.
>From: Ronnie Royston <RonnieR@globaldatasys.com>
>Reply-To: Ronnie Royston <RonnieR@globaldatasys.com>
>To: "'Frog.Leu@datacraft-asia.com'" <Frog.Leu@datacraft-asia.com>
>CC: ccielab@groupstudy.com
>Subject: RE: ?? : Multicast ping replies
>Date: Mon, 6 Nov 2000 14:30:24 -0600
>
>Frog, I set up a similar lab, every interface in dense mode. My design
>is:
>
> ____R3
> /
>R1-----R2<
> \____
> R4
>
>R2 to R3 & R4 is nbma. I have an 'ip igmp join 227.7.7.7' on R1 and R4's
>Lo0 interfaces. With a clean mroute table, if I ping 227.7.7.7 from R4, I
>get the following mroute table (from R4):
>
>(*, 227.7.7.7), 00:00:16/00:00:00, RP 0.0.0.0, flags: DJCL
> Incoming interface: Null, RPF nbr 0.0.0.0
> Outgoing interface list:
> Serial0.1, Forward/Dense, 00:00:16/00:00:00
> Loopback0, Forward/Dense, 00:00:16/00:00:00
>
>(4.1.1.1, 227.7.7.7), 00:00:12/00:02:48, flags: PCLT
> Incoming interface: Loopback0, RPF nbr 0.0.0.0
> Outgoing interface list:
> Serial0.1, Prune/Dense, 00:00:12/00:02:48
>
>(4.1.2.1, 227.7.7.7), 00:00:15/00:02:44, flags: CLT
> Incoming interface: Loopback1, RPF nbr 0.0.0.0
> Outgoing interface list:
> Loopback0, Forward/Dense, 00:00:15/00:00:00
> Serial0.1, Prune/Dense, 00:00:15/00:02:45
>
>From this table, it is clear that the router thinks there are no members of
>this group on the network? It is my understanding that when multicast
>traffic is generated in dense mode, all PIM-DM routers initially get the
>traffic. Here's the mroute table from the nearest upstream neighbor (R2)
>after that ping from R4:
>
>(*, 227.7.7.7), 00:09:00/00:02:59, RP 0.0.0.0, flags: D
> Incoming interface: Null, RPF nbr 0.0.0.0
> Outgoing interface list:
> Serial0/0, Forward/Dense, 00:09:00/00:00:00
>
>(4.1.1.1, 227.7.7.7), 00:00:09/00:02:50, flags: PTA
> Incoming interface: Serial0/0, RPF nbr 20.1.1.3
> Outgoing interface list: Null
>
>(4.1.2.1, 227.7.7.7), 00:00:11/00:02:48, flags: PTA
> Incoming interface: Serial0/0, RPF nbr 20.1.1.3
> Outgoing interface list: Null
>
>(20.1.1.3, 227.7.7.7), 00:00:12/00:02:47, flags: PTA
> Incoming interface: Serial0/0, RPF nbr 0.0.0.0
> Outgoing interface list: Null
>
>That's bulls*#t ! There is a member of that group a little bit further up.
>R4 knows the RPF path to R1's Lo0 int (the home of the 227.7.7.7 join),
>here's a 'sho ip rpf 1.1.2.2' (the ip of the Lo0 int):
>
>sleepy#sho ip rpf 1.1.2.2
>RPF information for ? (1.1.2.2)
> RPF interface: Serial0.1
> RPF neighbor: ? (20.1.1.2)
> RPF route/mask: 1.0.0.0/255.0.0.0
> RPF type: unicast
>
>I am confused and frustrated and ....damn multicasting is difficult!
>What's
>the dilio? Can somebody please explain? What am I missing???
>
>
>
>-----Original Message-----
>From: Frog.Leu@datacraft-asia.com [mailto:Frog.Leu@datacraft-asia.com]
>Sent: Monday, November 06, 2000 8:41 AM
>To: Ronnie Royston
>Cc: Frog.Leu@datacraft-asia.com
>Subject: ?? : Multicast ping replies
>
>
>Hi Sir,
> I am Frog from Taiwan. I have tried the multicast in Frame-relay
>many times but failed and failed again! Espically in RP in Spoke-1 and igmp
>join Spoke-2, it does not work by using Ping. Could you explain why? Or any
>suggestion? I have configured it as NBMA mode in hub and spokes. Is it
>nessary configured "ip pim nbma" "ONLY IN" hub of frame-relay?
>
>Please give me a hint or samples! Thanks you very much!!
>
>Frog Leu
>
>Network Integration Engineering Team Manager
>Datacraft Taiwan Limited
>3F-7, 188, Sec5, Nan-King E. Rd.,
>Taipei, Taiwan, R.O.C.
>Tel : 886-2-27609696#119
>Fax : 886-2-27568686
>E-mail : frog.leu@datacraft-asia.com
>
>
> > -----鴝l郵件-----
> > 寄件者: Ronnie Royston [SMTP:RonnieR@globaldatasys.com]
> > 傳送時間: 2000年11月6日 AM 03:48
> > 收件者: 'radha rani'; ccielab@groupstudy.com
> > 主旨: RE: Multicast ping replies
> >
> > Are you sure that inverse arp didn't make a full mesh? Are you running
> > dense, sparse, or sparse-dense? Do you have 'ip pim nbma-mode'
>configured
> > on the hub interface?
> >
> > -----Original Message-----
> > From: radha rani [mailto:radhaccie@hotmail.com]
> > Sent: Saturday, November 04, 2000 7:09 PM
> > To: ccielab@groupstudy.com
> > Subject: Multicast ping replies
> >
> >
> > I have 4 routers configured in a multicast group. 1 FR hub with three
> > spokes.
> >
> > Why is it that when I ping the multicast address from the hub router, i
> > get
> > three responses - one from each hub. But when I ping from a spoke
>router,
> > I
> >
> > get THREE responses from each member og the multicast group.
> > On each spoke router, only one lan interface is included in the m-cast
> > group. Can someone explain. Thanks in advance.
> >
> > -Radha
> >
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