From: Roman Rodichev (roman@iementor.com)
Date: Sun Jun 22 2008 - 11:35:48 ART
Does R1 have the R2-R3 IP subnet in its RIB?
Roman Rodichev
5xCCIE #7927 (R&S, Security, Voice, Storage, Service Provider)
Instructor, Content Developer. ieMentor Corporation
http://www.iementor.com
Y!M: roman7927
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Frank CCIE
Sent: Sunday, June 22, 2008 7:59 AM
To: Cisco certification
Subject: Multicast confused
Hi, Expert,
I have a simple scenario to test Multicast.
(f0/0) R1 (s0/0) -- (s0/0) R2 (s0/1) -- (s0/0) R3 (f0/0)
- Multicast mode is sparse-dense mode on all the port.
- RP and MA is on Loopback0 on R1
- R1(f0/0)# ip igmp join-group 224.1.1.1
Ping 224.1.1.1 in case 1-3:
-- case 1: ping 224.1.1.1 on R2 is ok.
** case 2: ping 224.1.1.1 with source port s0/0 on R3. ping failed. (use
extended ping)
-- case 3: ping 224.1.1.1 with source port f0/0 on R3. ping is ok.
Could you explain why the "ping" in case 2 failed?
The debug message on R2 is below. 10.10.23.3 is IP address of R3 s0/0,
10.10.33.3 is IP address of R3 f0/0.
Thanks you in advance.
Frank
==================
R2# debug ip mpacket
* IP(0): s=*10.10.23.3* (Serial0/1) d=224.1.1.1 id=7, ttl=254, prot=1,
len=104(100), *mroute olist null*
* IP(0): s=*10.10.33.3* (Serial0/1) d=224.1.1.1 (Serial1/0) id=8, ttl=253,
prot=1, len=100(100), *mforward*
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