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Configuration Guide - IP Multicast

S7700 and S9700 V200R013C00

This document describes the configurations of IP multicast, including IP multicast basics, IGMP, MLD, IPv4 PIM, IPv6 PIM, MSDP, multicast VPN, layer 3 multicast CAC, IPv4 multicast route management, IPv6 multicast route management, IGMP snooping, MLD snooping, static multicast MAC address, multicast VLAN replication, layer 2 multicast CAC, multicast network management.
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Licensing Requirements and Limitations for MLD Snooping

Licensing Requirements and Limitations for MLD Snooping

Involved Network Elements

An IPv6 multicast network consists of the following network elements:
  • Multicast source

    A device that sends multicast data to receiver hosts. For example, a video server is a multicast source.

  • IPv6 Protocol Independent Multicast (PIM) device

    A device that uses the IPv6 PIM protocol to generate and maintain multicast routing entries and forwards multicast data based on multicast routing entries. On an IPv6 multicast network, all Layer 3 devices must run IPv6 PIM; otherwise, multicast forwarding paths cannot be established.

  • MLD querier

    A device that exchanges MLD messages with receiver hosts to create and maintain group memberships. On a multicast network, Layer 3 devices connected to network segments of receivers must run the MLD protocol or be configured with static MLD groups. Otherwise, upstream PIM devices cannot know the multicast groups that users want to join, and therefore cannot establish multicast forwarding paths.

  • MLD snooping device

    A device that listens to MLD messages exchanged between upstream Layer 3 multicast devices and receiver hosts to create and maintain Layer 2 multicast forwarding entries, which are used for accurate multicast data forwarding on a Layer 2 network. To prevent broadcasting of multicast packets on a Layer 2 network and conserve network bandwidth, it is recommended that you configure MLD snooping on Layer 2 devices.

  • Receiver

    A multicast user that receives multicast data. A receiver can be a PC, a set top box, or any device with multicast client installed.

The "MLD Snooping Configuration" chapter describes how to configure MLD snooping on a Layer 2 device.

Licensing Requirements

MLD snooping is a basic feature of a switch and is not under license control.

Version Requirements

Table 12-5  Products and versions supporting MLD snooping
Product Product Model Software Version
S7700

S7703, S7706, and S7712

V100R003C01, V100R006C00, V200R001(C00&C01), V200R002C00, V200R003C00, V200R005C00, V200R006C00, V200R007C00, V200R008C00, V200R009C00, V200R010C00, V200R011C10, V200R012C00, V200R013C00

S7703 PoE

V200R013C00

S7706 PoE

V200R013C00

S9700

S9703, S9706, and S9712

V200R001(C00&C01), V200R002C00, V200R003C00, V200R005C00, V200R006C00, V200R007(C00&C10), V200R008C00, V200R009C00, V200R010C00, V200R011C10, V200R012C00, V200R013C00

NOTE:
For details about software mappings, visit Hardware Query Tool and search for the desired product model.

Feature Limitations

  • All the MLD snooping configurations on interfaces mentioned in this chapter are performed on Layer 2 physical interfaces, including Eth-Trunk interfaces.
  • If both Layer 2 and Layer 3 multicast services are required in a VLAN, enable MLD and IPv6 PIM on the corresponding VLANIF interface first, and then enable MLD Snooping in the VLAN. If MLD Snooping is enabled in the VLAN first, MLD and IPv6 PIM cannot be enabled on the VLANIF interface.
  • If an advanced ACL is referenced in an MLD snooping policy, the rules in the ACL can only specify source or destination IP addresses. If the advanced ACL contains a rule that specifies a protocol type or protocol port number, the MLD snooping policy does not take effect.
  • On a switch running MLD snooping, multicast flows that are not requested by users are considered unknown multicast flows. Multicast flows are considered unknown if they do not match any entry in the multicast forwarding table or if they match multicast forwarding entries with an empty outbound interface list. These flows are not requested by users. The default method that a switch uses to process unknown IPv6 multicast flows depends on whether Layer 2 multicast is enabled and which Layer 2 multicast forwarding mode is used:
    • If Layer 2 multicast is not enabled on a switch, the switch broadcasts unknown multicast flows.

    • If Layer 2 multicast is enabled on a switch, the switch broadcasts unknown multicast flows in the corresponding VLAN in MAC address-based forwarding mode and drops unknown multicast flows in IP address-based forwarding mode.

    To prevent broadcast of unknown multicast flows, run the multicast drop-unknown command in a VLAN or run the unknown-frame multicast drop command in a VSI to configure a switch to drop unknown multicast flows.

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Updated: 2019-04-08

Document ID: EDOC1100065742

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