3Com SuperStack 4 Configuration Manual page 174

186 C 7: M
HAPTER ULTICAST
Displaying and
debugging IGMP
PIM-DM Overview
P
ROTOCOL
Perform the following configuration in Interface view.
Table 199 Configuring the interval to send IGMP query message
Operation
Configure the interval to send IGMP query message
Restore the default value
When there are multiple multicast routers on a network segment, the querier is
responsible for sending IGMP query messages to all hosts on the LAN.
By default, the interval is 60 seconds.
Deleting IGMP Groups Joined on an Interface
You can delete an existing IGMP group from the interface using the following
command.
Perform the following configuration in Interface view.
Table 200 Deleting IGMP groups joined on an interface
Operation
Delete IGMP groups
joined on an interface
After the above configuration, execute
the running of IGMP configuration, and to verify the effect of the configuration.
Execute
debugging
Table 201 Displaying and debugging IGMP
Operation
Display the information about
members of IGMP multicast
groups
Display the IGMP configuration
and running information about
the interface
Enable the IGMP information
debugging
Disable the IGMP information
debugging
PIM-DM (Protocol Independent Multicast, Dense Mode) belongs to dense mode
multicast routing protocols. PIM-DM is suitable for small networks. Members of
multicast groups are relatively dense in such network environments.
The working procedures of PIM-DM include neighbor discovery, flood & prune and
graft.
Command
reset igmp group { all | interface
interface_number
group_mask
] } }
display
command in user view for the debugging of IGMP.
Command
display igmp group [
interface_type interface_number
interface
display igmp interface [
interface_number
debugging igmp { all | event | host |
packet | timer }
undo debugging igmp { all | event | host |
packet | timer }
Command
igmp timer query
undo igmp timer query
interface_type
{ all |
group_address
command in any view to display
group_address
interface_type
]
seconds
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