R3102-R3103-HP 6600/HSR6600 Routers IP Multicast Configuration Guide

31
• If the multicast group replacement feature is enabled, the multicast group that the router or the port
newly joins automatically replaces an existing multicast group that has the lowest address.
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 grou
ps that a port can join") before enablin
g
multicast
g
roup replacement. Otherwise, the multicast
g
roup replacement functionality will not take effect.
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.
3. Enable multicast group
replacement.
igmp-snooping overflow-replace
[ vlan vlan-list ]
Disabled by default.
Setting the 802.1p precedence for IGMP messages
You can change the 802.1p precedence of IGMP messages so that they can be assigned higher
forwarding priority when congestion occurs on their outgoing ports.
Setting the 802.1p precedence for IGMP messages globally
Step Command Remarks
1. Enter system view.
system-view N/A
2. Enter IGMP-snooping view.
igmp-snooping N/A
3. Set the 802.1p precedence for
IGMP messages.
dot1p-priority priority-number
The default 802.1p precedence for
IGMP messages is 0.
Setting the 802.1p precedence for IGMP messages in a VLAN