3Com 4500 Switch User Manual


 
1-13
Configuring a Static Router Port
In a network where the topology is unlikely to change, you can configure a port on the switch as a static
router port, so that the switch has a static connection to a multicast router and receives IGMP messages
from that router.
In Ethernet port view
Follow these steps to configure a static router port in Ethernet port view:
To do... Use the command... Remarks
Enter system view
system-view
Enter Ethernet port view
interface interface-type
interface-number
Configure the current port as a
static router port
multicast static-router-port
vlan vlan-id
Required
By default, no static router port
is configured.
In VLAN view
Follow these steps to configure a static router port in VLAN view:
To do... Use the command... Remarks
Enter system view
system-view
Enter VLAN view
vlan vlan-id
Configure a specified port as a
static router port
multicast static-router-port
interface-type interface-number
Required
By default, no static router port
is configured.
Configuring a Port as a Simulated Group Member
Generally, hosts running IGMP respond to the IGMP query messages of the multicast switch. If hosts
fail to respond for some reason, the multicast switch may consider that there is no member of the
multicast group on the local subnet and remove the corresponding path.
To avoid this from happening, you can configure a port of the VLAN of the switch as a multicast group
member. When the port receives IGMP query messages, the multicast switch will respond. As a result,
the port of the VLAN can continue to receive multicast traffic.
Through this configuration, the following functions can be implemented:
z When an Ethernet port is configured as a simulated member host, the switch sends an IGMP report
through this port. Meanwhile, the switch sends the same IGMP report to itself and establishes a
corresponding IGMP entry based on this report.
z When receiving an IGMP general query, the simulated host responds with an IGMP report.
Meanwhile, the switch sends the same IGMP report to itself to ensure that the IGMP entry does not
age out.
z When the simulated joining function is disabled on an Ethernet port, the simulated host sends an
IGMP leave message.