3Com Switch 8800 Configuration Guide
Chapter 27 IGMP Configuration
27-7
Configuring one interface of the router as multicast member can avoid such problem.
When the interface receives IGMP query packet, the router will respond, thus ensuring
that the network segment where the interface located can normally receive multicast
packets.
For an Ethernet switch, you can configure a port in a VLAN interface to join a multicast
group.
Perform the following configuration in the corresponding view.
Table 27-9
Configuring a router to join specified multicast group
Operation
Command
Configure the router to join
a specified multicast group
(in VLAN interface view)
igmp host-join
group-address port
{
interface_type
interface_ num | interface_name
} [
to
{
interface_type interface_ num | interface_name
} ]
Cancel the configuration (in
VLAN interface view)
undo igmp host-join
group-address
port
{
interface_type interface_ num | interface_name
}
[
to
{
interface_type interface_ num |
interface_name
} ]
Configure the router to join
a specified multicast group
(in Ethernet port view)
igmp host-join group-address vlan
vlanid
Cancel the configuration (in
Ethernet port view)
undo igmp host-join group-address vlan
vlanid
Note:
The above two configuration methods have the same result (both takes effect on port).
You can select any one of them.
By default, a router joins no multicast group. Note that the specified port must belong to
this VLAN interface on which IGMP is enabled. Otherwise, the configuration does not
take effect.
27.2.10 Limiting Multicast Groups that an Interface Can Access
A multicast router learns whether there are members of a multicast group on the
network via the received IGMP membership message. A filter can be set on an
interface so as to limit the range of allowed multicast groups.
Perform the following configuration in the corresponding view.
