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multicast problem

multicast problem

top:

4506------10.44.1.10

|

10.44.20.10---7604-----7606

|

6509--------10.44.50.35

trouble description:

1) 10.44.50.35 can access 10.44.20.10ï¼›

2) 10.44.50.35 can not access 10.44.1.10。

remark:

1) 10.44.50.35 can ping 10.44.20.10 and 10.44.50.35, router or switch have not access-list。

2) multicast protocol is dense-mode;

3) pim neighbor is okï¼›

4) show ip mroute infomation:

4506#show ip mroute 234.1.2.3

(10.44.1.10, 234.1.2.3), 00:00:05/00:02:54, flags: PT

Incoming interface: GigabitEthernet3/10, RPF nbr 10.44.222.3, RPF-MFD

Outgoing interface list:

GigabitEthernet3/1, Forward/Dense, 00:00:27/00:02:32 //connect 7606

7606#show ip mroute 234.1.2.3

(10.44.1.10, 234.1.2.3), 00:00:05/00:02:54, flags: PT

Incoming interface: null0, RPF nbr 0.0.0.0, RPF-MFD

Outgoing interface list:

GigabitEthernet5/1, Forward/Dense, 00:00:27/00:02:32 //connect 4506

GigabitEthernet5/2, Forward/Dense, 00:00:27/00:02:32 //connect 7604

GigabitEthernet5/3, Forward/Dense, 00:00:27/00:02:32 //connect 6509

7606#show ip mroute 234.5.6.7

(10.44.20.10, 234.5.6.7), 4w0d/00:02:54, flags: PT

Incoming interface: GigabitEthernet5/2, RPF nbr 0.0.0.0, RPF-MFD

Outgoing interface list:

GigabitEthernet5/1, Forward/Dense, 00:02:18/00:00:41

GigabitEthernet5/3, Forward/Dense, 00:02:18/00:00:41

6509#show ip mroute 234.1.2.3

6509#show ip mroute 234.5.6.7

(10.44.20.10, 234.5.6.7), 4w0d/00:02:54, flags: PT

Incoming interface: GigabitEthernet1/1, RPF nbr 0.0.0.0, RPF-MFD //connect 7606

Outgoing interface list:

Vlan10, Forward/Dense, 00:02:18/00:00:41

Vlan100, Forward/Dense, 00:02:18/00:00:41

problem:

1) 7606 show ip mroute 234.1.2.3 incoming interface is null0ï¼›

2) 6509 have not 234.1.2.3 multicast infomation。

1 REPLY
Hall of Fame Super Silver

Re: multicast problem

Hello Xian,

1) this depends where the source is placed.

group 234.1.2.3 has source 10.44.1.10

group 234.5.6.7 has source 10.44.20.10

if subnet 10.44.1.0 is directly connected to 7606 RPF=0.0.0.0 means that the local node is the source PIM node (= the source is in a connected subnet).

So this shouldn't be a problem if 10.44.1.10 is directly connected on C7606 (in other words if sh ip arp 10.44.1.10 is not empty on C7606)

2) this should depend from the fact C6509 thinks no one is interested in the stream (10.44.1.10, 234.1.2.3) but if so interface gi5/3 shouldn't appear in the oilist for (10.44.1.10, 234.1.2.3) on C7606.

Have you seen if over time sh ip mroute 234.1.2.3 keeps showing interface to C6509 in oilist?

is the PC trying to join to group 234.1.2.3?

what shows sh ip igmp groups on the C6509?

and is the RPF check passed on C6509?

use sh ip rpf 10.44.1.10

for this it should show the interface connected to C7606:gi5/3

Hope to help

Giuseppe

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