H3c-technologies H3C S3100V2 Series Switches Manuel d'utilisateur télécharger pdf (Page 32)

To solve these problems, disable that switch port from changing into a dynamic router port upon

receiving an IGMP general query or a PIM Hello message, so that network security and control over

multicast users are enhanced.

Follow these steps to disable a port or a group of ports from changing into dynamic router 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.

Disable the port or group of ports

from changing into dynamic router

ports

igmp-snooping router-port-deny

[ vlan vlan-list ]

Required

By default, the port or group of

ports can change into dynamic

router ports.

NOTE:

This configuration does not affect the static router port configuration.

Configuring IGMP snooping querier

Configuration prerequisites

Before you configure IGMP snooping querier, complete the following tasks:

• Enable IGMP snooping in the VLAN

• Determine the IGMP general query interval

• Determine the IGMP last-member query interval

• Determine the maximum response time to IGMP general queries

• Determine the source address of IGMP general queries

• Determine the source address of IGMP group-specific queries

Enabling IGMP snooping querier

In an IP multicast network running IGMP, a multicast router or Layer 3 multicast switch is responsible for

sending IGMP general queries, so that all Layer 3 multicast devices can establish and maintain multicast

forwarding entries to forward multicast traffic correctly at the network layer. This router or Layer 3 switch

is called “IGMP querier.”

However, a Layer 2 multicast switch does not support IGMP, and cannot send general queries by default.

By enabling IGMP snooping on a Layer 2 switch in a VLAN where multicast traffic needs to be Layer-2

switched only and no multicast routers are present, the Layer 2 switch will act as the IGMP snooping

querier to send IGMP queries, allowing multicast forwarding entries to be established and maintained at

the data link layer.

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H3c-technologies H3C S3100V2 Series Switches Manuel d'utilisateur Page 32

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