From: CCIE2B (ccie2b@xxxxxxx)
Date: Wed Sep 18 2002 - 04:23:37 GMT-3
Group,
I was wondering if someone could help me understand this multicast
behavior...
R1 (MA) is connected to R2 and R3 via p2m links and to R4 (Auto-RP) via a p2p
link. On R1, I do not see S0.1 as an outgoing interface for (*,232.2.2.2).
>From R1 the routing table is congruent with the multicast shared tree. From
R2, the router thinks that the RPF for group 232.2.2.2 is via 172.16.123.3
(other FR spoke). There is no multicast connection between R1 and R3. Why is
R1 not showing interface s0.1 as an outgoing interface for group 232.2.2.2?
And why does R2 think that R3 should be the next reverse path router to the
source? The source is connected to R3. Thanks in advance...
r1#sh run int s0.1
interface Serial0.1 multipoint
ip address 172.16.123.1 255.255.255.0
ip pim sparse-dense-mode
ip ospf network non-broadcast
ip ospf cost 200
frame-relay map ip 172.16.123.1 103 broadcast
frame-relay map ip 172.16.123.2 102 broadcast
frame-relay map ip 172.16.123.3 103 broadcast
no frame-relay inverse-arp
end
interface Serial0.2 point-to-point
ip address 172.16.14.1 255.255.255.0
ip pim sparse-dense-mode
frame-relay interface-dlci 104
end
r1#
r1#sh ip mroute
(*, 224.0.1.39), 00:13:26/00:00:00, RP 0.0.0.0, flags: DJCL
Incoming interface: Null, RPF nbr 0.0.0.0
Outgoing interface list:
Serial0.2, Forward/Sparse-Dense, 00:13:26/00:00:00
Serial0.1, Forward/Sparse-Dense, 00:13:26/00:00:00
Loopback0, Forward/Sparse-Dense, 00:13:26/00:00:00
(172.16.104.1, 224.0.1.39), 00:12:59/00:02:01, flags: CLTA
Incoming interface: Serial0.2, RPF nbr 172.16.14.4
Outgoing interface list:
Loopback0, Forward/Sparse-Dense, 00:12:59/00:00:00
Serial0.1, Forward/Sparse-Dense, 00:12:59/00:00:00
(*, 224.0.1.40), 00:13:26/00:00:00, RP 0.0.0.0, flags: DJCL
Incoming interface: Null, RPF nbr 0.0.0.0
Outgoing interface list:
Serial0.2, Forward/Sparse-Dense, 00:13:27/00:00:00
Serial0.1, Forward/Sparse-Dense, 00:13:27/00:00:00
Loopback0, Forward/Sparse-Dense, 00:13:27/00:00:00
(172.16.101.1, 224.0.1.40), 00:12:40/00:02:15, flags: CLTA
Incoming interface: Loopback0, RPF nbr 0.0.0.0
Outgoing interface list:
Serial0.1, Forward/Sparse-Dense, 00:12:40/00:00:00
Serial0.2, Forward/Sparse-Dense, 00:12:40/00:00:00
(*, 232.2.2.2), 00:13:27/00:00:00, RP 172.16.104.1, flags: SJCL
Incoming interface: Serial0.2, RPF nbr 172.16.14.4
Outgoing interface list:
Loopback0, Forward/Sparse-Dense, 00:13:27/00:02:31
r1#sh ip route
O 172.16.32.0/22 [110/75] via 172.16.14.4, 00:44:41, Serial0.2
C 172.16.14.0/24 is directly connected, Serial0.2
C 172.16.1.0/24 is directly connected, Ethernet0
C 172.16.123.0/24 is directly connected, Serial0.1
O 172.16.105.1/32 [110/76] via 172.16.14.4, 00:40:50, Serial0.2
O 172.16.104.1/32 [110/65] via 172.16.14.4, 00:40:51, Serial0.2
r2#sh run int s0
interface Serial0
ip address 172.16.123.2 255.255.255.0
ip pim sparse-dense-mode
encapsulation frame-relay IETF
ip ospf network non-broadcast
ip ospf priority 0
no fair-queue
frame-relay map ip 172.16.123.1 201 broadcast
frame-relay map ip 172.16.123.2 201 broadcast
frame-relay map ip 172.16.123.3 201 broadcast
no frame-relay inverse-arp
frame-relay lmi-type ansi
end
r2#
r2#sh ip mroute
(*, 224.0.1.39), 00:12:22/00:02:59, RP 0.0.0.0, flags: DJC
Incoming interface: Null, RPF nbr 0.0.0.0
Outgoing interface list:
Serial0, Forward/Sparse-Dense, 00:12:22/00:00:00
Ethernet0, Forward/Sparse-Dense, 00:12:22/00:00:00
(172.16.104.1, 224.0.1.39), 00:11:49/00:02:10, flags: PCTA
Incoming interface: Serial0, RPF nbr 172.16.123.3
Outgoing interface list:
Ethernet0, Prune/Sparse-Dense, 00:11:49/00:00:16
(*, 224.0.1.40), 00:12:23/00:00:00, RP 0.0.0.0, flags: DJCL
Incoming interface: Null, RPF nbr 0.0.0.0
Outgoing interface list:
Serial0, Forward/Sparse-Dense, 00:12:23/00:00:00
Ethernet0, Forward/Sparse-Dense, 00:12:25/00:00:00
(172.16.101.1, 224.0.1.40), 00:12:25/00:02:53, flags: CLT
Incoming interface: Serial0, RPF nbr 172.16.123.1
Outgoing interface list:
Ethernet0, Forward/Sparse-Dense, 00:12:25/00:00:00
(*, 232.2.2.2), 00:12:25/00:00:00, RP 172.16.104.1, flags: SJCL
Incoming interface: Serial0, RPF nbr 172.16.123.3
Outgoing interface list:
Ethernet0, Forward/Sparse-Dense, 00:11:30/00:02:58
Loopback0, Forward/Sparse-Dense, 00:12:25/00:02:05
r2#sh ip route
O 172.16.32.0/22 [110/74] via 172.16.123.3, 00:42:10, Serial0
O 172.16.14.0/24 [110/128] via 172.16.123.1, 00:42:10, Serial0
O 172.16.1.0/24 [110/74] via 172.16.123.1, 00:42:10, Serial0
C 172.16.123.0/24 is directly connected, Serial0
O 172.16.105.1/32 [110/75] via 172.16.123.3, 00:42:10, Serial0
O 172.16.104.1/32 [110/75] via 172.16.123.3, 00:42:11, Serial0
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