From: Bob Sinclair (bobsinclair@frontiernet.net)
Date: Fri Jun 09 2006 - 13:31:00 ART
Sami,
The 224.0.1.39 group is used by the RP candidate to announce its candidacy to
the mapping agent. Only the mapping agent is a member of this group. The
router you show below is not a member, is not "listening". Note there is no C
or L flag on the *.G entry. This router is simply reflecting state for the
active stream.
HTH,
Bob Sinclair
CCIE #10427, CCSI 30427
www.netmasterclass.net
----- Original Message -----
From: Sami
To: Cisco certification
Sent: Friday, June 09, 2006 6:34 AM
Subject: Multicast Auto RP
Group,
I have following group mapping in multicast routing table.
150.1.5.5 , 224.0.1.39 ----> upstream neighbour address
150.1.8.8 , 224.0.1.40 -----> Auto-rp agent
I understand autorp agent is sending multicast discovery for rp-group
mapping on 224.0.1.10 address but what about 224.0.1.39 ??
I see on all the router each neigbour is listning on 224.0.1.39 from
upstram router.
What I understand 224.0.1.40 is used for listning group to rp mapping from
auto-rp but what about 224.0.1.39 ?
Thanks,
R1# sho ip mro
Interface state: Interface, Next-Hop or VCD, State/Mode
(*, 224.0.1.39), 00:21:25/stopped, RP 0.0.0.0, flags: D
Incoming interface: Null, RPF nbr 0.0.0.0
Outgoing interface list:
Serial0/0/0, Forward/Sparse, 00:21:25/00:00:00
FastEthernet0/0, Forward/Sparse, 00:21:25/00:00:00
(150.1.5.5, 224.0.1.39), 00:00:25/00:02:36, flags: PT
Incoming interface: FastEthernet0/0, RPF nbr 141.1.145.5
Outgoing interface list:
Serial0/0/0, Prune/Sparse, 00:00:26/00:02:33
(*, 224.0.1.40), 00:21:55/stopped, RP 0.0.0.0, flags: DCL
Incoming interface: Null, RPF nbr 0.0.0.0
Outgoing interface list:
Serial0/0/0, Forward/Sparse, 00:21:55/00:00:00
FastEthernet0/0, Forward/Sparse, 00:21:55/00:00:00
(150.1.8.8, 224.0.1.40), 00:15:14/00:02:26, flags: LT
Incoming interface: FastEthernet0/0, RPF nbr 141.1.145.5
Outgoing interface list:
Serial0/0/0, Forward/Sparse, 00:00:36/00:00:00
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