23
Step Command
Remarks
2.
Enter Layer 2 Ethernet
interface view, Layer 2
aggregate interface view, or
port group view.
•
Enter Layer 2 Ethernet interface
view or Layer 2 aggregate
interface view:
interface
interface-type
interface-number
•
Enter port group view:
port-group
manual
port-group-name
Use either command.
3.
Enable IGMP snooping
fast-leave processing.
igmp-snooping
fast-leave
[
vlan
vlan-list
]
Disabled by default.
Disabling a port from becoming a dynamic router port
The following problems might exist in a multicast access network:
•
After receiving an IGMP general query or a PIM hello message from a connected host, a router port
becomes a dynamic router port. Before its timer expires, this dynamic router port receives all
multicast packets within the VLAN where the port belongs, and forwards them to the host, affecting
normal multicast reception of the host.
•
In addition, the IGMP general query or PIM hello message that the host sends affects the multicast
routing protocol state on Layer 3 devices, such as the IGMP querier or DR election, and might
further cause network interruption.
To solve these problems, disable that router port from becoming a dynamic router port after the port
receives an IGMP general query or a PIM hello message, so as to improve network security and control
over multicast users.
To disable a port from becoming a dynamic router port:
Step Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enter Layer 2 Ethernet
interface view, Layer 2
aggregate interface view, or
port group view.
•
Enter Layer 2 Ethernet interface
view or Layer 2 aggregate
interface view:
interface
interface-type
interface-number
•
Enter port group view:
port-group
manual
port-group-name
Use either command.
3.
Disable the ports from
becoming dynamic router
port.
igmp-snooping router-port-deny
[
vlan
vlan-list
]
By default, a port can become a
dynamic router port.
NOTE:
This configuration does not affect the static router port configuration.
