From: HP-France,ex2 ("SANCHEZ-MONGE,ANTONIO)
Date: Tue Oct 07 2003 - 13:29:27 GMT-3
Hi Rolando, Ozgur,
That's it, using sparse mode and setting r2 as RP fixes the issue.
Thanks a lot to ALL.
Cheers,
Antonio.
-----Original Message-----
From: Alvarez, Rolando [NCSUS] [mailto:RAlvare5@NCSUS.JNJ.COM]
Sent: martes, 07 de octubre de 2003 17:55
To: 'SANCHEZ-MONGE,ANTONIO (HP-France,ex2)'
Subject: RE: Multicast in NBMA
Antonio,
I am not a multicast expert by any means, but I will try to give you my
opinion. For this topology, I would try using Auto-RP so that the multicast
runs on sparse-mode. I think that you may be running into the Reverse Path
Forwarding that dense-mode uses. Since the packet came in on s0/0.30, it
will not forward that packet out that same interface. Try making r2 the rp
and ma for this group, and your issue may be resolved. Let me know if that
helps.
Thanks,
Rolando
-----Original Message-----
From: SANCHEZ-MONGE,ANTONIO (HP-France,ex2)
[mailto:antonio.sanchez-monge@hp.com <mailto:antonio.sanchez-monge@hp.com> ]
Sent: Tuesday, October 07, 2003 8:32 AM
To: 'ccielab@groupstudy.com'
Subject: Multicast in NBMA
Hi All,
Nice to meet you. I am beginning to prepare CCIE lab.
Could you please help me with this problem?
My topology: Frame-relay multipoint
r2 192.168.30.2(lo0 = 192.168.2.2)
/ / \
/ / \
/ / \
/ / \
(r4)(r3) (r5)
|________|
OSPF is running everywhere, every router can ping the others' loopbacks.
Also PIM Sparse-Dense is running everywhere.
The frame-relay maps are all configured for broadcast.
The Ethernet interface of r3 (192.168.20.3) and r2 loopback (192.168.2.2)
are multicast group 225.6.7.8 receivers.
When the multicast sender is r4, only r2 replies, whereas if it is r2 the
sender, r3 replies too.
I think this has to do with the multipoint architecture, but I cannot see
how to get a reply from r3 r4 (or how to get r2 forwarding the multicast
packet originated by r4 to r3). Any clues?
r2#sh ip mroute
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
Outgoing interface flags: H - Hardware switched
Timers: Uptime/Expires
Interface state: Interface, Next-Hop or VCD, State/Mode
(*, 224.0.1.40), 00:44:09/00:00:00, RP 0.0.0.0, flags: DCL
Incoming interface: Null, RPF nbr 0.0.0.0
Outgoing interface list:
Serial0/0.30, Forward/Sparse-Dense, 00:44:09/00:00:00
(*, 225.6.7.8), 00:15:22/00:00:00, RP 0.0.0.0, flags: DCL
Incoming interface: Null, RPF nbr 0.0.0.0
Outgoing interface list:
Loopback0, Forward/Sparse-Dense, 00:07:56/00:00:00
Serial0/0.30, Forward/Sparse-Dense, 00:15:22/00:00:00
(192.168.2.2, 225.6.7.8), 00:00:07/00:02:52, flags: CLT
Incoming interface: Loopback0, RPF nbr 0.0.0.0
Outgoing interface list:
Serial0/0.30, Forward/Sparse-Dense, 00:00:10/00:00:00
(192.168.30.4, 225.6.7.8), 00:02:57/00:00:03, flags: CLT
Incoming interface: Serial0/0.30, RPF nbr 192.168.30.4
Outgoing interface list:
Loopback0, Forward/Sparse-Dense, 00:02:57/00:00:00
r2#i
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static
route
o - ODR, P - periodic downloaded static route
Gateway of last resort is not set
192.168.30.0/24 is variably subnetted, 4 subnets, 2 masks
O 192.168.30.4/32 [110/64] via 192.168.30.4, 00:30:40, Serial0/0.30
O 192.168.30.5/32 [110/64] via 192.168.30.5, 00:30:40, Serial0/0.30
O 192.168.30.3/32 [110/64] via 192.168.30.3, 00:30:40, Serial0/0.30
C 192.168.30.0/28 is directly connected, Serial0/0.30
192.168.4.0/32 is subnetted, 1 subnets
O 192.168.4.4 [110/65] via 192.168.30.4, 00:30:40, Serial0/0.30
192.168.2.0/32 is subnetted, 1 subnets
C 192.168.2.2 is directly connected, Loopback0
192.168.3.0/32 is subnetted, 1 subnets
O 192.168.3.3 [110/65] via 192.168.30.3, 00:30:41, Serial0/0.30
Thanks & Cheers,
Antonio.
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