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port, the system establishes corresponding forwarding entry for the port after receiving a report from
the simulated member host.
To set the maximum number of IPv6 multicast groups that a port can join:
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 approach.
3.
Set the maximum number of
IPv6 multicast groups that a
port can join.
mld-snooping group-limit
limit
[
vlan
vlan-list
]
By default, the upper limit is 4000
for the HPE 5800 switches, and
1000 for the HPE 5820X switches.
Enabling IPv6 multicast group replacement
IMPORTANT:
Be sure to configure the maximum number of IPv6 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
)" before enabling IPv6 multicast group replacement. Otherwise, the IPv6 multicast group
replacement function does not take effect.
In certain situations, the number of IPv6 multicast groups that a switch or a port can join might
exceed the upper limit. In addition, in some specific applications, an IPv6 multicast group that the
switch newly joins must replace an existing IPv6 multicast group automatically. A typical example is
"channel switching." To view a new TV channel, a user switches from the current IPv6 multicast
group to the new one.
To realize such requirements, enable the IPv6 multicast group replacement function on the switch or
on a certain port. When the number of IPv6 multicast groups that the switch or the port has joined
reaches the limit, one of the following occurs:
•
If the IPv6 multicast group replacement feature is disabled, new MLD reports are automatically
discarded.
•
If the IPv6 multicast group replacement feature is enabled, the IPv6 multicast group that the
switch or the port newly joins automatically replaces an existing IPv6 multicast group that has
the lowest IPv6 address.
Enabling IPv6 multicast group replacement globally
Step Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enter MLD-snooping view.
mld-snooping
N/A
3.
Enable IPv6 multicast group
replacement.
overflow-replace
[
vlan
vlan-list
]
Disabled by default.
Enabling IPv6 multicast group replacement on a port
