From: aniz.kv@gmail.com
Date: Thu Sep 13 2007 - 13:55:40 ART
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#
This archive was generated by hypermail 2.1.4 : Sat Oct 06 2007 - 12:01:11 ART