H3c-technologies H3C S3100V2 Series Switches Uživatelský manuál stáhnout pdf (Strana 66)

MLD snooping configuration(available only on

the S3100V2-EI)

This chapter includes these sections:

• MLD snooping overview

• MLD snooping configuration task list

• Displaying and maintaining MLD snooping

• MLD snooping configuration examples

• Troubleshooting MLD snooping

MLD snooping overview

Multicast Listener Discovery (MLD) snooping is an IPv6 multicast constraining mechanism that runs on

Layer 2 switches to manage and control IPv6 multicast groups.

Introduction to MLD snooping

By analyzing received MLD messages, a Layer 2 switch that is running MLD snooping establishes

mappings between ports and multicast MAC addresses and forwards IPv6 multicast data based on these

mappings.

As shown in Figure 21, w

hen MLD snooping is not running, IPv6 multicast packets are broadcast to all

devices at Layer 2. When MLD snooping runs, multicast packets for known IPv6 multicast groups are

multicast to the receivers at Layer 2.

Figure 21 Before and after MLD snooping is enabled on the Layer 2 switch

IPv6 multicast packet transmission

without MLD Snooping

Source

Multicast router

Host A

Receiver

Host B

Host C

Receiver

IPv6 multicast packets

Layer 2 switch

IPv6 multicast packet transmission

when MLD Snooping runs

Source

Multicast router

Host A

Receiver

Host B

Host C

Receiver

Layer 2 switch

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H3c-technologies H3C S3100V2 Series Switches Uživatelský manuál Strana 66