Setting The 802.1P Precedence For Igmp Messages - HP MSR ASM Configuration Manual

If the IPv6 multicast group replacement is disabled, the IGMP snooping-enabled router or the port
•
discards IGMP reports for joining a new IPv6 multicast group.
In some specific applications, such as channel switching, a newly joined multicast group must
automatically replace an existing multicast group. In this case, the function of IPv6 multicast group
replacement must also be enabled so a user can switch from the current multicast group to a new one.
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
multicast group replacement. Otherwise, the multicast group replacement functionality will not take effect.
Enabling multicast group replacement globally
Step
1. Enter system view.
2. Enter IGMP-snooping view.
3. Enable multicast group
replacement.
Enabling multicast group replacement on a port
Step
1. Enter system view.
Enter Layer 2 Ethernet
2.
interface view or Layer 2
aggregate interface view, or
enter port group view.
3. Enable multicast group
replacement.

Setting the 802.1p precedence for IGMP messages

When congestion occurs on outgoing ports of a switch, it forwards IGMP messages according to their
802.1p priorities, from highest to lowest. You can assign higher forwarding priority to IGMP messages by
changing their 802.1p precedence.
Setting the 802.1p precedence for IGMP messages globally
Step
1. Enter system view.
2. Enter IGMP-snooping view.
3. Set the 802.1p precedence for
IGMP messages.
"Setting the maximum number of multicast groups that a port can
Command
system-view
igmp-snooping
overflow-replace [ vlan vlan-list ]
Command
system-view
•
•
igmp-snooping overflow-replace
[ vlan vlan-list ]
Command
system-view
igmp-snooping
dot1p-priority priority-number
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
154
join") before enabling
Remarks
N/A
N/A
Disabled by default.
Remarks
N/A
Use either command.
Disabled by default.
Remarks
N/A
N/A
The default 802.1p precedence for
IGMP messages is 0.