From: Tolulope Ogunsina (togunsina@gmail.com)
Date: Tue Feb 03 2009 - 13:00:58 ARST
Nitro,
For Q1. George's Observation is correct. As far as autorp listener is
turned on, the 224.0.1.39 and 40 will work in DENSE mode. nbma mode
will not work for them. I suggest you turn off autorp listener and set
default candidate RPs for 224.0.1.39 and 40.
Q2. Not necessarily. NBMA mode will work fine for the sparse mode
groups (groups with an RP) when you configure sparse-dense mode.
Q3. Your Understanding is correct
HTH,
On 2/2/09, NET HE <he_net@hotmail.com> wrote:
> Your understanding of QNS 2 and 3 is correct.
>
> For QNS 1, the mechanism behind it is,
> R3 (RP) is the source of 224.0.1.39 stream. And since the router R2 (hub) is
> running on sparse-mode, it needs a RP to which it will send the 239.0.1.39
> stream. But R2 doesn't know, so it drops the 239.0.1.39 stream. The same to
> 224.0.1.40, even though R2 (hub) receives join-message (*, 224.0.1.40) from
> R4
> (MA), since R2 doesn't know any RP, it drops the join.
>
> There is a walkaround, you can define a static RP for 224.0.1.39 and
> 224.0.1.40. Best Regards, Net (Xin) He > Date: Mon, 2 Feb 2009 17:34:29
> +0100> Subject: Re: Multicast - NBMA> From: georgeroman@gmail.com> To:
> nitrodrops@hotmail.com> CC: ccielab@groupstudy.com> > Hi Nitro> > a)ip pim
> nbma-mode is used only for sparse-mode.> > b)The 224.0.1.39 and 224.0.1.40
> groups are used in dense fashion.> > a) + b) = you need to tunnel in this
> case> > > Best regards,> George> > On Wed, Jan 21, 2009 at 1:04 PM, Nitro
> Drops <nitrodrops@hotmail.com> wrote:> > > Hi All,> >> > Have been
> practising
> multicast by placing around RP and MA around in a> > Hub-N-Spoke.> >> > R3 -
> Spoke1 > RP> > R2 - Hub> > R4 - Spoke2 > MA> >> > R3 s2/1 >> s2/1 R2 s2/1 >>
> s2/1 R4> >> > Full Reachability using EIGRP.> >> > R2> > interface
> Serial2/1>
>> ip address 155.8.10.2 255.255.255.0> > ip pim nbma-mode <<< included this>
>> >
> ip pim sparse-mode> > encapsulation frame-relay> > no ip split-horizon eigrp
> 1> > no ip mroute-cache> > frame-relay map ip 155.8.10.3 203 broadcast> >
> frame-relay map ip 155.8.10.4 204 broadcast> > no frame-relay inverse-arp> >
> !> > ip pim autorp listener> >> > R3 (RP)> > ip pim autorp listener> > ip
> pim
> send-rp-announce Loopback0 scope 16> >> > R4 (MA)> > ip pim autorp listener>
>>
> ip pim send-rp-discovery Loopback0 scope 16> >> >> > QNS 1 : I kept
> encountering the announcement 224.0.1.39 from RP > MA got> > stuck> > at the
> Hub, even though i have configured "ip pim nbma mode". Did i miss> > out> >
> anything?> >> >> > P(0): s=150.8.3.3 (Serial2/1) d=224.0.1.39 id=299,
> ttl=15,
> prot=17,> > len=52(48), mroute olist null> > IP(0): s=150.8.3.3 (Serial2/1)
> d=224.0.1.39 id=322, ttl=15, prot=17,> > len=52(48), mroute olist null> >> >
> l> > R2#sh ip mro> > IP Multicast Routing Table> >> > Outgoing interface
> flags: H - Hardware switched, A - Assert winner> > Timers: Uptime/Expires> >
> Interface state: Interface, Next-Hop or VCD, State/Mode> >> > (*,
> 224.0.1.39),
> 00:14:52/stopped, RP 0.0.0.0, flags: DC> > Incoming interface: Null, RPF nbr
> 0.0.0.0> > Outgoing interface list:> > Serial2/1, Forward/Sparse,
> 00:14:06/00:00:00> >> > (150.8.3.3, 224.0.1.39), 00:00:46/00:02:13, flags:
> PT>
>> Incoming interface: Serial2/1, RPF nbr 155.8.10.3> > Outgoing interface
> list: Null> >> > (*, 224.0.1.40), 00:15:04/00:02:18, RP 0.0.0.0, flags: DCL>
>>
> Incoming interface: Null, RPF nbr 0.0.0.0> > Outgoing interface list:> >
> Serial2/1, Forward/Sparse, 00:14:07/00:00:00> >> >> > QNS 2 : if all the 3
> routers are running 'sparse-dense' mode, a tunnel will> > be> > required
> between the spokes. Since 'ip nbma mode' is only supported on> >
> 'sparse-mode'> >> > QNS 3 : if all the 3 routers are running 'dense' mode,
> R3
> (Server) R2> > (Client), again a tunnel will be required between the spokes,
> since the> > incoming CANT be the same as the outgoing interface on the
> multicast> > routing> > table.> >> >> > Cheers> > Nit> >> >
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-- Best Regards,Tolulope.
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