From: Ivan (ivan@iip.net)
Date: Tue Jan 16 2007 - 19:42:41 ART
Hello !
Now i'm learn multicast and certanly problem appear. More then four hour spend
with it but unsuccessfull. I will try describe briefly.
H&S topology (FR). R2 - R1 - R3
R1 - FR-multipoint, nbma, DR
- l1 - MA
R2 - l1 - RP static
R3 - l0 - receiver
All routers know about RP correctly.
In my opinion R1(HUB) & R2(RP) must see R3 as receiver. And built shared tree
until active source appear. But don't.
More detail next.
Receiver wish to receive traffic for group 224.1.2.3 and send IGMP-message.
---- int l0 ip igmp-join 224.1.2.3 ----R3 has no exist (*,224.1.2.3) and create such entry. ----- (*, 224.1.2.3), 00:14:08/00:02:10, RP 172.16.10.10, flags: SJCL Incoming interface: Serial1/3, RPF nbr 172.16.16.2 Outgoing interface list: Loopback0, Forward/Sparse-Dense, 00:14:08/00:02:10 -----
Once OIL change in this entry from NULL to NOT-NULL. R3 must send join to RP. But r3 don't send this messahe in my case. Can you help me grasp ?
------ R3#clear ip mrou 224.1.2.3 R3# *Jan 17 00:59:59.306: PIM(0): Check RP 172.16.10.10 into the (*, 224.1.2.3) entry *Jan 17 00:59:59.306: PIM(0): Building Triggered (*,G) Join / (S,G,RP-bit) Prune message for 224.1.2.3 ------
Nothing at all about 224.1.2.3 on R2 and R1. ------ R1#sh ip mroute 224.1.2.3 Group 224.1.2.3 not found
R2#sh ip mroute 224.1.2.3 (*, 224.1.2.3), 00:50:32/00:02:28, RP 172.16.10.10, flags: SJCL Incoming interface: Null, RPF nbr 0.0.0.0 Outgoing interface list: Loopback0, Forward/Sparse-Dense, 00:50:32/00:02:28 ------
-- Ivan
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