H3C Technologies H3C S5120 Series Switches - Manual (Page 324)

2-19
Configuring multicast group replacement on a port or a group of ports
Follow these steps to configure multicast group replacement on a port or a group of ports:
To do... Use the command... Remarks
Enter system view system-view —
interface interface-type
interface-number
Enter Ethernet interface/Layer
2 aggregate interface view or
port group view
port-group manual
port-group-name
Required
Use either approach
Enable multicast group
replacement
igmp-snooping
overflow-replace [ vlan
vlan-list ]
Required
Disabled by default
Be sure to configure the maximum number of multicast groups allowed on a port (refer to Configuring
Maximum Multicast Groups that Can Be Joined on a Port ) before enabling multicast group replacement.
Otherwise, the multicast group replacement functionality will not take effect.
Configuring 802.1p Precedence for IGMP Messages
You can change 802.1p precedence of IGMP messages so that they can be assigned higher forwarding
priority when congestion occurs on their outgoing ports.
Configuring 802.1p precedence for IGMP messages globally
Follow these steps to configure 802.1p precedence for IGMP messages globally:
To do... Use the command... Remarks
Enter system view system-view —
Enter IGMP-Snooping view igmp-snooping —
Configure 802.1p precedence
for IGMP messages
dot1p-priority priority-number
Required
The default 802.1p precedence
for IGMP messages is 0.
Configuring 802.1p precedence for IGMP messages in a VLAN
Follow these steps to configure 802.1p precedence for IGMP messages in a VLAN:
To do... Use the command... Remarks
Enter system view system-view —
Enter VLAN view vlan vlan-id —
Configure 802.1p precedence
for IGMP messages in the
VLAN
igmp-snooping
dot1p-priority priority-number
Required
The default 802.1p precedence
for IGMP messages is 0.