From: Roman Rodichev (roman@iementor.com)
Date: Sun Jul 15 2007 - 16:00:03 ART
Check "show ip pim rp mapping" on every router, do you see R2's IP address
as RP for 224.0.0.0/4 ?
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
Cagri Yucel
Sent: Sunday, July 15, 2007 9:59 AM
To: Group study
Subject: Basic multicast question
I am really confused with this one :(
R1----R4----R3----R2----R5
R5 has an interface joined to 224.24.24.24
R4-R3-R2-R5 has all interfaces configured for sparse-dense mode
R2 is configured as RP and Mapping agent
Quite straight forward configuration
Ping 224.24.24.24 gets no response from R5
Why outgoing interfaces null on R4 ? See below
I know I am doing something silly :(
R4#sh ip mro
IP Multicast Routing Table
Flags: D - Dense, S - Sparse, B - Bidir Group, s - SSM Group, C - Connected,
L - Local, P - Pruned, R - RP-bit set, F - Register flag,
T - SPT-bit set, J - Join SPT, M - MSDP created entry,
X - Proxy Join Timer Running, A - Candidate for MSDP Advertisement,
U - URD, I - Received Source Specific Host Report,
Z - Multicast Tunnel, z - MDT-data group sender,
Y - Joined MDT-data group, y - Sending to MDT-data group
Outgoing interface flags: H - Hardware switched, A - Assert winner
Timers: Uptime/Expires
Interface state: Interface, Next-Hop or VCD, State/Mode
(*, 224.24.24.24), 00:10:29/stopped, RP 10.10.2.2, flags: SPF
Incoming interface: Ethernet0/1, RPF nbr 10.0.34.3
Outgoing interface list: Null
(10.0.14.1, 224.24.24.24), 00:01:04/00:01:55, flags: PFT
Incoming interface: Ethernet0/0, RPF nbr 0.0.0.0
Outgoing interface list: Null
(*, 224.0.1.39), 00:10:42/stopped, RP 0.0.0.0, flags: D
Incoming interface: Null, RPF nbr 0.0.0.0
Outgoing interface list:
Ethernet0/1, Forward/Sparse-Dense, 00:10:43/00:00:00
(10.10.2.2, 224.0.1.39), 00:02:43/00:00:16, flags: PT
Incoming interface: Ethernet0/1, RPF nbr 10.0.34.3
Outgoing interface list: Null
-- -cagri
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