From: Rich Collins (nilsi2002@gmail.com)
Date: Fri Sep 14 2007 - 12:31:23 ART
I can suggest some troubleshooting on R2.
check the mroutes
R2#sh ip mroute 239.39.39.39 and make sure there is no "null" on the
Outgoing interface.
On R2 you can "debug ip mpacket"
Also make sure you don't have stale entries by clearing ip mroute * and
clear ip pim rp-mapping. Check the rp mapping on various routers in your
network.
I think with Dynamips you have to remember to always enable "ip cef".
Rich
On 9/13/07, aniz.kv@gmail.com <aniz.kv@gmail.com> wrote:
>
> I was configuring multicast on the IE WB v4.1 Lab4. Could not get it
> working.
>
> The requirement says that they should be able to ping 2 multicast listener
> IGMP groups on 2 interfaces of R3, from VLAN 48. The groups are
> 225.25.25.25 & 239.39.39.39. I'm able to ping 225.25.25.25 consistently
> without any problems. However, ping to 239.39.39.39 works only after i
> issued either "no ip mroute-cache" on the f0/0, or "no ip cef" on R2.
>
> In the topology, R2 is the RP for 225.25.25.25 & R5 is the RP for
> 239.39.39.39. R8 is the mapping agent. I'm pinging from BB3.
>
> -It starts working when i move the RP to R2 (for grp 239...)
> -auto rp listener is added on all
> -it also starts working with "no ip mroute-cache" on the f0/0, or "no ip
> cef" on R2.
> - i'm using 12.3(21) on c7200 (Dynamips)
>
>
> R3(s2/0.1)---FR---(s2/0)R2(f0/0)----Tun0--(f1/0)R5(F0/0,s0/0,s0/1)---R4(f1/0)--BB3
>
>
>
> ----| FR |---| |---| |---| |
> R3 |----| R2|---|R5 |---| R4|--|BB3
> ----| |---| | |---| |---| |
> |
> |---|
> | R8|
> |---|
>
> Here's some interesting output from R2 (i enabled PD on the interfaces to
> troubleshoot).
>
> Rack1R2#sh ip nbar protocol-discovery stats packet-count protocol icmp
>
> Tunnel0
> Input Output
> Protocol Packet Count Packet Count
> ------------------------ ------------------------
> ------------------------
> icmp 86 0
> unknown 3 0
> Total 89 0
>
> Serial2/0
> Input Output
> Protocol Packet Count Packet Count
> ------------------------ ------------------------
> ------------------------
> icmp 0 0
> unknown 0 0
> Total 0 0
> Rack1R2#sh ip nbar protocol-discovery stats packet-count protocol icmp
>
> Tunnel0
> Input Output
> Protocol Packet Count Packet Count
> ------------------------ ------------------------
> ------------------------
> icmp 100 0
> unknown 4 0
> Total 104 0
>
> Serial2/0
> Input Output
> Protocol Packet Count Packet Count
> ------------------------ ------------------------
> ------------------------
> icmp 0 0
> unknown 0 0
> Total 0 0
> Rack1R2#
> Rack1R2#
> Rack1R2#
> Rack1R2#conf t
> Enter configuration commands, one per line. End with CNTL/Z.
> Rack1R2(config)#int f0/0
> Rack1R2(config-if)#no ip mroute-cache
> Rack1R2(config-if)#^Z
> Rack1R2#
> *Sep 13 19:22:30.455: %SYS-5-CONFIG_I: Configured from console by console
> Rack1R2#
> Rack1R2#
> Rack1R2#sh ip nbar protocol-discovery stats packet-count protocol icmp
>
> Tunnel0
> Input Output
> Protocol Packet Count Packet Count
> ------------------------ ------------------------
> ------------------------
> icmp 104 4
> unknown 5 0
> Total 109 4
>
> Serial2/0
> Input Output
> Protocol Packet Count Packet Count
> ------------------------ ------------------------
> ------------------------
> icmp 4 0
> unknown 0 0
> Total 4 0
> Rack1R2#sh ip nbar protocol-discovery stats packet-count protocol icmp
>
> Tunnel0
> Input Output
> Protocol Packet Count Packet Count
> ------------------------ ------------------------
> ------------------------
> icmp 116 16
> unknown 6 0
> Total 122 16
>
> Serial2/0
> Input Output
> Protocol Packet Count Packet Count
> ------------------------ ------------------------
> ------------------------
> icmp 16 0
> unknown 0 0
> Total 16 0
> Rack1R2#
>
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