From: nicky noname (cisco2study@gmail.com)
Date: Fri Nov 09 2007 - 13:01:12 ART
Hello,
If you disable IGMP snooping on a switch, the switch will still
forward IGMP messages to and from the host/ router right?
The difference being that the IGMP messages will be flooded on the
vlan. So when the multicast traffic is forwarded to the LAN switch
from the router, after the router recieves an IGMP join, now will the
switch drop the traffic because it has no entries in the forwarding
table, or will it broadcast the traffic out all ports. ( under IGMP
conditions, only the IGMP traffic goes via the CPU and the pim traffic
goes to the ports listed in the forwarding table).
I have been reading about this and would like to feel sure that the
switch will not allow hosts to join groups and receive Multicast
traffic, if IGMP snooping is off.....but I cannot find this out for
sure. As, but default, a switch will forward unknown multicast MAC
addresses out all ports in the VLAN.........so I have my doubts.....
This archive was generated by hypermail 2.1.4 : Sat Dec 01 2007 - 06:37:29 ART