From: Timothy Snow (timsnow@cogeco.ca)
Date: Thu Jun 19 2003 - 03:44:12 GMT-3
Hello again... I have a question regarding PIM sparse-mode RP and
whether to tell the RP that
it is the RP. There seems to be some discrepancy with multiple cisco
press books. See below.
Per Jeff Doyle Vol II (pg 544, 1st paragraph, line 9) " The reason for
this statement on
this router, of course, is so that the router knows that is is the RP."
Contradicting that is Beau Williamson, Multicast (Pg 343, Note section)
"When the router,
whose address is in this field receives the (*,G) Join message, it sees
its own address
in this field and assumes that i must be the RP for the group. Therefor
a router always
assumes the duties of the RP for a group and time it receives a an
incoming (*,G) join
that contains the address of one of it's multicast-enabled interfaces in
this field"
*Feb 28 22:30:41: PIM: Received v2 Join/Prune on Serial0.95 from
10.2.3.5, to us
*Feb 28 22:30:41: PIM: Join-list: (*, 228.13.20.216) RP 10.224.1.1
*Feb 28 22:30:41: PIM: (*, 228.13.20.216) Join from 10.2.3.5 for invalid
RP 10.224.1.1
r9(config)#access-list 9 deny 224.0.1.39
r9(config)#access-list 9 deny 224.0.1.40
r9(config)#access-list 9 permit any
r9(config)#ip pim rp-address 10.224.1.1 9
*Feb 28 22:32:40: PIM: Received v2 Join/Prune on Serial0.95 from
10.2.3.5, to us
*Feb 28 22:32:40: PIM: Join-list: (*, 228.13.20.216) RP 10.224.1.1
*Feb 28 22:32:40: MRT: Create (*, 228.13.20.216), RPF Null, PC 0x353148E
*Feb 28 22:32:40: PIM: Check RP 10.224.1.1 into the (*, 228.13.20.216)
entry, RPT-bit
set, WC-bit set, S-bit set
*Feb 28 22:32:40: MRT: Add/Update Serial0.95/224.0.0.2 to the olist of
(*, 228.13.20.
216), Forward state
*Feb 28 22:32:40: PIM: Add Serial0.95/10.2.3.5 to (*, 228.13.20.216),
Forward state
As you can see above, it only worked when I told the RP about the RP
(that is, itself)
I did try turning on "ip pim sparse" due to Williamson saying "of one of
it's multicast
enabled interfaces" but that didn't work. I also tried configuring a
"ip pim accept-rp"
permitting everything but that didn't work.
Can anyone answer this for me?
Thanks.
TIm
This archive was generated by hypermail 2.1.4 : Fri Jul 04 2003 - 11:11:00 GMT-3