Suppressing Flooding Of Unknown Multicast Traffic In A Vlan - H3C S3100-52P Operation Manual

Operation Manual – Multicast
H3C S3100-52P Ethernet Switch
Enable IGMP Snooping
Enable IGMP Snooping
querier
Configure the interval
between IGMP general
queries
Configure the source IP
address of IGMP general
queries

3.2.8 Suppressing Flooding of Unknown Multicast Traffic in a VLAN

With IGMP Snooping enabled in a VLAN, multicast traffic for unknown multicast groups
is flooded within the VLAN by default. This wastes network bandwidth and affects
multicast forwarding efficiency.
With the unknown multicast flooding suppression function enabled, when receiving a
multicast packet for an unknown multicast group, an IGMP Snooping switch creates a
nonflooding entry and relays the packet to router ports only, instead of flooding the
packet within the VLAN. If the switch has no router ports, it drops the multicast packet.
The difference between the IGMP Snooping non-flooding function and the function of
dropping unknown multicast packets is in that the former passes unknown multicast
packets to the router ports while the latter directly discards unknown multicast packets.
Follow these steps to suppress flooding of unknown multicast traffic in the VLAN:
Enter system view
Enable unknown multicast
flooding suppression
To do...
igmp-snooping enable
igmp-snooping querier
igmp-snooping
query-interval seconds
igmp-snooping
general-query source-ip
{ current-interface |
ip-address }
To do...
system-view
igmp-snooping
nonflooding-enable
Chapter 3 IGMP Snooping Configuration
Use the command...
Use the command...
3-12
Remarks
Required
Required
By default, IGMP
Snooping querier is
disabled.
Optional
By default, the interval
between IGMP general
queries is 60 seconds.
Optional
By default, the source IP
address of IGMP general
queries is 0.0.0.0.
Remarks
—
Required
By default, unknown
multicast flooding
suppression