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120 CHAPTER 6: MULTICAST PROTOCOL
query router receives the IGMP Membership Report message within the defined
period (equal to robust-value seconds), it continues to maintain the membership
of this group. When the IGMP query router receives no IGMP Membership Report
messages from any hosts within the defined period, it perceives a timeout and
stops membership maintenance for the group.
Perform the following configuration in VLAN interface view.
By default, the robust-value is 2.
This command is only available on an IGMP query router running IGMP v2. For a
host running IGMP v1, this command cannot take effect, because the host may
not send the IGMP Leave message when it leaves a group.
Configuring the Limit of IGMP Groups on an Interface
You limit the number of multicast groups, from 0 to 1024, on an interface using
the following configuration.
Perform the following configuration in VLAN interface view.
Configuring a Router to be a Member of a Group
Usually, the host operating IGMP will respond to IGMP query packet of the
multicast router. In case of a response failure, the multicast router will consider
that there is no multicast member on this network segment and will cancel the
corresponding path. Configuring one interface of the router as a multicast
member can avoid such a problem. When the interface receives an IGMP query
packet, the router will respond, ensuring that the network segment is connected
and can receive multicast packets.
Perform the following configuration in VLAN interface view.
Table 124 Configure the Times of Sending IGMP Group-Specific Query Packet
Operation Command
Configure the times of sending IGMP
Group-Specific Query packet
igmp robust-count robust-value
Restore the times of sending IGMP
Group-Specific Query packet to the default
value
undo igmp robust-count
Table 125 Configure the Limit of IGMP Groups on an Interface
Operation Command
Configure the limit of IGMP groups on an
interface
igmp group-limit limit
Restore the limit of IGMP groups on an
interface to the default value
undo igmp group-limit
Table 126 Configure a Router to Be a Member of a Group
Operation Command
Configure a router to be a member of a
multicast group (VLAN interface view)
igmp host-join group-address port
{ interface_type interface_num |
interface_name } [ to { interface_type
interface_num | interface_name } ]