07-17-2006 07:48 AM - edited 03-03-2019 04:05 AM
I am having trouble with Ghost multicast on a 2950. What do I need to configure on the 2950 for Multicast to work with ghost?
The following is enable on the router.
ip pim dense-mode
ip cgmp
07-17-2006 08:17 AM
Hi Randy,
If the hosts are in the same VLAN then you don't really need to configure anything, if they are in different VLANs then have you added "ip multicast-routing" to your router?
Rgds
Paddy
07-17-2006 10:41 AM
It is on the same vlan and I do have multicast routing enable also. Igmp snooping is enabled on the 2950 switch. Does the 2950 require anything else.
07-17-2006 10:21 AM
Where is the stream coming from? Are the multicast recievers having problem only happening on user in 2950? Is this only happening on a single vlan? Do you know which group id is having issue? Do you have any reason why there is ip cgmp on that interface?
can you provide the following:
from the router:
show ip mroute
show ip igmp
from the switch:
show ip igmp snooping mrouter vlan vlan-id
show ip igmp snooping vlan vlan-id
All of the above is assuming that the mcast is routed, if the streamer and the receiver are in the same vlan, the 2950 should work as is. Also, you can try on the 2950:
no ip igmp snooping >> This will flood the mcast to all the ports and we can use this to isolate if the mcast is getting to the 2950 and it's igmp is not working.
Please rate all posts.
07-17-2006 01:05 PM
The client and server are on the same subnet. The user had to disable something involveing McAfee ver. 8. The multicast ghost is working. But the router is being driven to 100% and it's killing the network. I am assumming that it is flooding the net with multicast.
BL-1#show ip igmp snooping vlan 1
Global IGMP Snooping configuration:
-----------------------------------
IGMP snooping : Enabled
IGMPv3 snooping (minimal) : Enabled
Report suppression : Enabled
TCN solicit query : Disabled
TCN flood query count : 2
Vlan 1:
--------
IGMP snooping : Enabled
Immediate leave : Disabled
Multicast router learning mode : pim-dvmrp
Source only learning age timer : 10
CGMP interoperability mode : IGMP_CGMP
BL-1#show ip igmp snooping mrouter vlan 1
Vlan ports
---- -----
1 Fa0/23(dynamic)
Fa0/23 is the interface that connects to the router.
Should the learning mode be cgmp intstead of PIM.
07-17-2006 07:33 PM
multicast being flooded on the switch might not have nothing to do with the router reaching 100% cpu util. And what have you captured to see if the packets are indeed getting flooded? I will ask again, is there a reason why ip cgmp is enabled on that router's interface?
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