From: Edward Taggart (etaggart@xxxxxxxxx)
Date: Sun Oct 31 1999 - 23:21:39 GMT-3
I got it to work by using the "ip pim nbma-mode" on the hub router. I had
tried this command before but was greeted with the warning "PIM nbma-mode is
not recommended for dense-mode".
I went out today and bought Parkhurst's book on Multicast routing. Thus
far, it's been the only decent reference I could find. On page 221, there's
a reference to nbma-mode that says it "only works with PIM-Sparse Mode"....
However, in his description of nbma-mode he says it will limit multicast
traffic from going to spoke routers that are not part of a join group that
the traffic is going to. That sounds more like the function of sparse mode
anyway. Perhaps nbma-mode simply solves the split-horizon issue for PIM...
Thanks for all the help!
- Ed
> -----Original Message-----
> From: Jason Aarons [mailto:jaarons@hotmail.com]
> Sent: Sunday, October 31, 1999 4:38 PM
> To: etaggart@pivot.net; ccielab@groupstudy.com
> Subject: Re: Multicast routing problem
>
>
> I got it to work in a point to point network (no frame-relay) between
> R1---R2---R3.
>
> I added ip igmp join-group 224.10.1.2 to all interfaces (including the
> serial interfaces).
>
> r3#ping 224.10.1.2
> Type escape sequence to abort.
> Sending 1, 100-byte ICMP Echos to 224.10.1.2, timeout is 2 seconds:
>
> Reply to request 0 from 172.16.3.2, 8 ms <---my R2
> Reply to request 0 from 172.16.2.1, 12 ms <--- my R1
> Reply to request 0 from 172.16.4.1, 4 ms <---my R3 loopback
> r3#
>
> Only thing I can thing of is "ip pim nbma-mode" for frame-relay.
>
>
> ----Original Message Follows----
> From: "Edward Taggart" <etaggart@pivot.net>
> Reply-To: "Edward Taggart" <etaggart@pivot.net>
> To: "Ccielab@Groupstudy.Com" <ccielab@groupstudy.com>
> Subject: Multicast routing problem
> Date: Sat, 30 Oct 1999 23:51:59 -0400
>
> I'm having difficulty with multicast routing over a frame network. Here's
> my setup...
>
> R1 ---- R2 ----- R3
>
> R2 is frame hub with phys multipoint int, R1 & R3 are spokes with point to
> point subinterfaces. All routing and ip connectivity is good.
>
> Sample configs:
>
> R1:
> Int E0
> ip igmp join-group 224.10.1.2
> ip pim dense-mode
> Int S0.1
> ip pim dense-mode
>
> R2:
> Int E0
> ip igmp join-group 224.10.1.2
> ip pim dense-mode
> Int S0
> ip pim dense-mode
>
> R3
> Int E0
> ip igmp join-group 224.10.1.2
> ip pim dense-mode
> Int S0.1
> ip pim dense-mode
>
> Pinging the multicast address 224.10.1.2 from R2 gets responses from R1 &
> R3. Pining from R1 there's no response from R3 and from R3
> nothing from R1.
> It's similar to a split-horizon problem.. Any help would be appreciated!
>
> Thanks - Ed
> << winmail.dat >>
>
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