274
Configuration restrictions and guidelines
When you set the maximum number of IPv6 multicast groups on a port, follow these restrictions and
guidelines:
•
This configuration takes effect only on the IPv6 multicast groups that the port joins dynamically.
•
If the number of IPv6 multicast groups on a port exceeds the limit, the system removes all the
forwarding entries related to that port. In this case, the receiver hosts attached to that port can
join IPv6 multicast groups again before the number of IPv6 multicast groups on the port reaches
the limit.
Configuration procedure
To set the maximum number of IPv6 multicast groups 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.
interface
interface-type
interface-number
N/A
3.
Set the maximum number of
IPv6 multicast groups on the
port.
mld-snooping group-limit
limit
[
vlan vlan-list
]
By default, no limit is placed on
the maximum number of IPv6
multicast groups on a port.
Enabling the IPv6 multicast group replacement feature
This feature enables the device to replace an existing group with a newly joined group when the
number of groups exceeds the upper limit. This feature is typically used in the channel switching
application. Without this feature, the device discards MLD reports for new groups, and the user
cannot change to the new channel.
Configuration restrictions and guidelines
When you enable the IPv6 multicast group replacement feature, follow these restrictions and
guidelines:
•
This configuration takes effect only on the multicast groups that the port joins dynamically.
•
You can enable this feature globally for all ports in MLD-snooping view or for a port in interface
view. For a port, the port-specific configuration takes priority over the global configuration.
Configuration procedure
To enable the IPv6 multicast group replacement feature globally:
Step
Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enter MLD-snooping view.
mld-snooping
N/A
3.
Enable the IPv6 multicast
group replacement feature
globally.
overflow-replace
[
vlan vlan-list
]
By default, the IPv6 multicast
group replacement feature is
disabled globally.
To enable the IPv6 multicast group replacement on a port:
Step
Command
Remarks
1.
Enter system view.
system-view
N/A
