H3c-technologies H3C S3100V2 Series Switches Manual de usuario descargar pdf (Pagina 38)

are attached to the Layer 2 device, the Layer 3 device directly connected with it will receive duplicate

IGMP reports from these members.

With the IGMP report suppression function enabled, within each query cycle, the Layer 2 device

forwards only the first IGMP report per multicast group to the Layer 3 device and will not forward the

subsequent IGMP reports from the same multicast group to the Layer 3 device. This helps reduce the

number of packets being transmitted over the network.

Follow these steps to configure IGMP report suppression:

To do... Use the command... Remarks

Enter system view

system-view —

Enter IGMP snooping view

igmp-snooping —

Enable IGMP report suppression

report-aggregation

Optional

Enabled by default

CAUTION:

On an IGMP snooping proxy, IGMP membership reports are suppressed if the entries for the

corresponding groups exist in the forwarding table, whether the suppression function is enabled or not.

Configuring maximum multicast groups that a port can join

To regulate multicast traffic on a port, configure the maximum number of multicast groups that the port

can join.

Follow these steps to configure the maximum number of multicast groups that a port can join:

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

Configure the maximum number of

multicast groups that a port can

join

igmp-snooping group-limit limit

[ vlan vlan-list ]

Optional

512 by default

NOTE:

• When the number of multicast groups that a port has joined reaches the maximum number confi

ured,

the system deletes all the forwarding entries persistent to that port from the IGMP snooping forwardin

table, and the hosts on this port need to join the multicast groups again.

• If you have confi

ured static or simulated joins on a port, however, when the number of multicast

roups

on the port exceeds the confi

ured threshold, the system deletes all the forwardin

entries persistent to

that port from the IGMP snooping

forwardin

table and applies the static or simulated joins a

ain, until

the number of multicast groups joined by the port comes back within the configured threshold.

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