From: David Lonnie (david.lonnie@gmail.com)
Date: Sun Jun 15 2008 - 09:19:00 ART
Hi,pal.
Thanks all the time.
I tried on R3:ping 224.1.1.1 source s0/0 and ping 224.1.1.1 source e0/0
all fail to ping the group.
i must add " ip pim sparse-dense-mode" to e0/0 of R3
I really confused.
David
On Sun, Jun 15, 2008 at 7:55 PM, Joseph Brunner <joe@affirmedsystems.com>
wrote:
> The router doing the ping is sending pings from all interfaces, try "ping
> 224.1.1.1 source S0" on R3 if you don't want to enable multicast on E0.
>
> When you enabled multicast on R3's E0 and you pinged, this time that
> interface can join the tree and get the feed.
>
> The DR message simply says it's the DR on the segment, now that pim has
> started on R3's E0.
>
> -Joe
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> David Lonnie
> Sent: Sunday, June 15, 2008 7:19 AM
> To: ccielab@groupstudy.com
> Subject: A question about multicast
>
> Hi,folks:
>
> This is a question about multicast.
>
> This is my topology.
>
> R1(e0)--------------(e0)R2(s0)--------------------(s0)R3(e0)---
>
> These interfaces configurated in sparse-dense-mose.
>
> R1:e0 and lo0
> R2:e0 and s0
> R3:s0
>
> R1 is auto-rp candicate and bsr for group 224.1.1.1
>
> and now i ping 224.1.1.1 on R2, it's OK.
> but when i ping the group on R3,it shows timeout.
>
> when i add "ip pim sparse-dense-mode" command to the e0 interface of
> R3,there is a log message:
>
> *Mar 2 19:55:46.007: %PIM-5-DRCHG: DR change from neighbor 0.0.0.0 to
> 150.1.8.1
> on interface Ethernet0/0
>
> and then ping the group,it works.
>
> That's why? it seems strange.
>
> can somebody clarify this occurrence for me?
>
>
> Thanks in advance for your help.
>
>
>
>
> David
>
>
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