From: huangyinxiao@gmail.com
Date: Sun Apr 15 2007 - 07:25:49 ART
Hi all,
I have a very odd problem on multicast when doing lab.
The problem is R2 cannot the group 224.1.1.1 which R4's loopback join in.
-------------The topology-----------------------------
R4---(multipoint FR)R1---R5---(point-to-point FR)R2
-------------Configuration------------------------
All routers enable sparse-mode on the interfaces which connected to each other.
Only the loopback 0 of R4 and R1 join sparse -mode, and the other routers' loopback does not eabled sparse mode. All routers enabled ip pim autorp lister.
R4 is rp:
ip pim send-rp-announce Loopback0 scope 16 group-list 11
access-list 11 permit 224.1.1.1
R1 is the mapping agent:
ip pim send-rp-discovery loopback 0 scope 16
-------------Test and verification-------------------
R1 loopback 0: 8.8.1.1 R4 loopback 0: 8.8.4.4
After R2 ping 224.1.1.1 fail, the rp and mapping go as follow:
on R2
R2#ping 224.1.1.1
Type escape sequence to abort.
Sending 1, 100-byte ICMP Echos to 224.1.1.1, timeout is 2 seconds:
.
R2#sh ip pim rp
Group: 224.1.1.1, RP: 8.8.4.4, v2, v1, uptime 08:40:56, expires 00:02:16
R2#sh ip pim rp mapping
PIM Group-to-RP Mappings
Group(s) 224.1.1.1/32
RP 8.8.4.4 (?), v2v1
Info source: 8.8.1.1 (?), elected via Auto-RP
Uptime: 08:41:00, expires: 00:02:11
R2#sh ip mroute
(*, 224.1.1.1), 00:03:26/stopped, RP 8.8.4.4, flags: SP
Incoming interface: Serial0/0, RPF nbr 8.8.13.1
Outgoing interface list: Null
(150.1.8.2, 224.1.1.1), 00:03:26/00:00:03, flags: T
Incoming interface: FastEthernet0/0, RPF nbr 0.0.0.0
Outgoing interface list:
Serial0/0, 8.8.13.1, Forward/Sparse, 00:03:26/00:03:01
(*, 224.0.1.39), 08:44:20/stopped, RP 0.0.0.0, flags: D
Incoming interface: Null, RPF nbr 0.0.0.0
Outgoing interface list:
Serial0/0, Forward/Sparse, 08:44:20/00:00:00
FastEthernet0/0, Forward/Sparse, 08:44:20/00:00:00
(8.8.4.4, 224.0.1.39), 00:01:24/00:01:38, flags: PT
Incoming interface: Serial0/0, RPF nbr 8.8.13.1
Outgoing interface list:
FastEthernet0/0, Prune/Sparse, 00:01:24/00:01:35
(*, 224.0.1.40), 11:24:52/stopped, RP 0.0.0.0, flags: DCL
Incoming interface: Null, RPF nbr 0.0.0.0
Outgoing interface list:
Serial0/0, Forward/Sparse, 11:21:33/00:00:00
FastEthernet0/0, Forward/Sparse, 11:24:52/00:00:00
(8.8.1.1, 224.0.1.40), 08:44:21/00:02:57, flags: LT
Incoming interface: Serial0/0, RPF nbr 8.8.13.1
Outgoing interface list:
FastEthernet0/0, Forward/Sparse, 08:44:21/00:00:00
------------------Problems---------------------------
1. The only problem is R2 ping 224.1.1.1 fail
2. The "sh ip mroute" tables, "sh ip pim rp" tables and "sh ip pim rp mapping" tables in all routers along the way towards ip multicast feed look no problem.
3. After R2's loopback enable sparse mode, R2 ping 224.1.1.1 success. Can someone explain why success?
Base on previous demonstration, I suspect that it may be IOS problem. The IOS I am currently using on R2 is 12.3(14)T7. Did you guys experience the same problems before. Or I did something wrong in my multicast network?
Any sugguests and solutions are highly appreciate.
Thanks,
Laurence
This archive was generated by hypermail 2.1.4 : Tue May 01 2007 - 08:28:35 ART