32
Step Command
Remarks
•
Enter port group view:
port-group
manual
port-group-name
3.
Set the maximum number of
multicast groups that the port
can join.
igmp-snooping group-limit
limit
[
vlan
vlan-list
]
By default, the upper limit is 4000
for the HPE 5800 switches, and
2000 for the HPE 5820X switches.
Enabling multicast group replacement
IMPORTANT:
Be sure to configure the maximum number of multicast groups that a port can join to a value other
than the default one (see "
Setting the maximum number of multicast groups that a port can join
before enabling multicast group replacement. Otherwise, the multicast group replacement
functionality does not take effect.
In certain situations, the number of multicast groups that the switch or a port joins might exceed the
upper limit. In addition, in some specific applications, a multicast group that the switch newly joins
must replace an existing multicast group automatically. A typical example is channel switching. To
view a new channel, a user switches from the current multicast group to the new one.
To realize such requirements, you can enable the multicast group replacement function on the switch
or on a certain port. When the number of multicast groups that the switch or on the port has joined
reaches the limit, one of the following occurs:
•
If the multicast group replacement feature is disabled, new IGMP reports are automatically
discarded.
•
If the multicast group replacement feature is enabled, the multicast group that the switch or the
port newly joins automatically replaces an existing multicast group that has the lowest address.
Enabling multicast group replacement globally
Step Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enter IGMP-snooping view.
igmp-snooping
N/A
3.
Enable multicast group
replacement.
overflow-replace
[
vlan
vlan-list
]
Disabled by default.
Enabling multicast group replacement on a port
Step Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enter Layer 2 Ethernet
interface view or Layer 2
aggregate interface view, or
enter 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.
