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Configuration Guide - IP Multicast

S7700 and S9700 V200R010C00

This document describes IP multicast basics and how to configure IP multicast features, including IGMP/MLD, PIM (IPv4&IPv6), MSDP, multicast VPN, Layer 3 multicast CAC, Layer 2 multicast CAC, IGMP/MLD snooping, and multicast VLAN, IPv4&IPv6 multicast route management, static multicast MAC address, multicast network.
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Discarding Unknown Multicast Flows

Discarding Unknown Multicast Flows

Context

Unknown multicast flows are those that do not match any entry in the multicast forwarding table or 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 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 the switch, the switch broadcasts unknown multicast flows in the corresponding VLAN.

  • If Layer 2 multicast is enabled, 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.

If a switch broadcasts unknown multicast flows in a VLAN, you can configure the switch to drop unknown multicast flows, reducing instant bandwidth usage.

Procedure

  1. Run:

    system-view

    The system view is displayed.

  2. Run:

    vlan vlan-id

    The VLAN view is displayed.

  3. Run:

    multicast drop-unknown

    The switch is configured to discard unknown multicast flows.

    NOTE:

    The multicast drop-unknown command configures the switch to discard all unknown IPv4 and IPv6 multicast packets, including the protocol packets that are transparently transmitted within the VLAN and use the reserved multicast address.

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Updated: 2019-08-21

Document ID: EDOC1000141903

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