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Webcast-Catalyst9k
New Member

Multicast config

Hi all

I have multicast source and destination separated by two routers(6500)...and enabled ip pim-dense mode on both the routers.

enabled ip cgmp between vlan interface and access switch where receiver is connected

when i issue sh ip mroute on 6500 which is closer to receiver..I am getting

(10.192.1.5, 224.1.2.1), 00:06:37/00:03:25, flags: CT

Incoming interface: Vlan61, RPF nbr 0.0.0.0, RPF-MFD

Outgoing interface list:

Vlan117, Forward/Dense, 00:00:43/00:00:00, H

What could be the problem ..and what means rpf-mfd?

on the access switch i can not see receiver port listed in sh cgmp.

Regards,

Rajesh

5 REPLIES

Re: Multicast config

Is the receiver in vlan 117? What kind of switch is the receiver in? Only XL platform run CGMP only, most of the other newer switches from 2950 on up run IGMP Snooping. Does the switch you run the show cgmp have mroute port?

the "RPF-MFD" (reverse path forwarding-multicast fast drop) indicator is present in the (S,G), tells us that the (S,G) entry is a complete shortcut and, from the perspective of the MSFC, the traffic is being forwarded in hardware (H).

Is the receiver getting a stream?

New Member

Re: Multicast config

Hi,

here is actual connectivity betwee source and receiver.

source---->6509---L2->6509--L3(vlan 117)-->6509----L2---->3524XL-->Receiver

vlan 117 is for L3 connectivity between two routers(6500).

interface vlan 111 is the receiver vlan

which is on the router closer to receiver.

interface Vlan111

ip address 10.192.70.3 255.255.255.0

ip pim dense-mode

ip cgmp

mls rp ip

standby 111 ip 10.192.70.1

standby 111 priority 110

sh cgmp on the 3524-xl(where receiver is connected)

CGMP is running.

CGMP Fast Leave is running.

CGMP Allow reserved address to join GDA .

Default router timeout is 300 sec.

vLAN IGMP MAC Address Interfaces

------ ----------------- -----------

111 0100.5e00.013c Gi0/2 Gi0/1 Fa0/22

111 0100.5e00.0128 Gi0/1

111 0100.5e01.0465 Gi0/1

vLAN IGMP Router Expire Interface

------ ----------------- -------- ----------

111 0003.6bc2.6242 248 sec Gi0/1

111 0003.6bc5.f842 249 sec Gi0/1

but the port where receiver fa0/1 is not coming into the list.

is there any addtional configuration requires for cgmp?

Regards,

Rajesh

Re: Multicast config

where is sho ip igmp group? This will tell us if we get a membership from the user in the vlan 11. No membership no OIL on ip moroute for vlan 111. Can you also capture show ip igmp interface vlan 111? The 6509 IGMP mode should by default auto-learnt via PIM or IGMP packets. I am not sure what IOS you are running but can you try under the interface vlan 111 - "ip igmp snooping mrouter learn cgmp ". I take it that since there is no multicast table being built in the XL that the client is not getting the stream? If the router returns a message that "ip igmp snooping mrouter learn cgmp" is being deprecated, it mean it should be auto learned. Then for testing purpose you can either disable the cgmp on XL or under interface vlan 111 try "ip igmp join-group x.x.x.x". See if that works.

New Member

Re: Multicast config

Hi,

It started working after adding ip igmp join-group.

I am wondering wht this command does ?

i can now even see receiver port listed in sh cgmp on 3524-xl.

One more qn..if want to make ip pim sparse-mode instead of dense mode in this network scenario what changes i have to make.

what would be the ideal RP switch ?

Thanks & regards,

Rajesh

Re: Multicast config

It started working after adding ip igmp join-group.

I am wondering wht this command does ?

i can now even see receiver port listed in sh cgmp on 3524-xl.

>>> ip igmp-group is forcing the router to send the stream to that vlan. It is just a work around, interface vlan 111 is not in the OIL of that group and S,G will no be built for the group unless we get a report or a join from a client from that vlan. I would check for that client if it's sending a join, you might need to get a sniffer trace, if you wnat to pursue. Another possible workaround that might be better than ip igmp join-group is "ip igmp static-group"

http://www.cisco.com/en/US/products/hw/switches/ps700/products_tech_note09186a00800b0871.shtml

One more qn..if want to make ip pim sparse-mode instead of dense mode in this network scenario what changes i have to make.

what would be the ideal RP switch ?

>> http://www.cisco.com/univercd/cc/td/doc/cisintwk/ito_doc/ipmulti.htm#xtocid26

http://www.cisco.com/en/US/tech/tk828/technologies_tech_note09186a0080094821.shtml#intro

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