How to configure the Multicast Service in an MSTP Network

Prerequisites

Basic configurations for the MSTP network are complete. For details about configuring the MSTP network, see Configuring the MSTP. This topic describes how to configure the multicast service in an MSTP network.

Application Context

Below figure shows the application context of the multicast service in an MSTP network. When the multicast service is provisioned in an MSTP ring network, the multicast upstream port and the cascading port need to be added to the multicast VLAN. According to the running result of the MSTP protocol, the multicast request packets are sent from the root port or the default port (when the device is a root bridge), and the other ports in the VLAN serve as cascading ports.

Application context of the multicast service in an MSTP network

Default Configuration

Default settings of the multicast service

Feature

Default Settings

Multicast protocol

Disabled

IGMP version, includes multicast user version and multicast VLAN version.

V3

Multicast program configuration mode

Static configuration mode

Multicast bandwidth management

Enabled

Multicast preview

Enabled

Multicast log function

Enabled

Procedure

For details on configuring the MSTP ring network, see Configuring the MSTP.

1, For details on configuring the multicast service, see Configuring the Multicast Service in a Single-NE Network.

2, Configure the MSTP multicast upstream port.

When multicast service is provisioned in an MSTP network, the multicast upstream port needs to be set to the MSTP mode, and the default upstream port of the multicast VLAN can be specified. After the configuration is completed, multicast packets are forwarded by the root port or default port of the multicast VLAN.

  • Run the igmp uplink-port-mode mstp command to set the upstream port to the MSTP mode.
  • Run the igmp default uplink-port command to specify the default upstream port of the multicast VLAN. When the upstream port is set to the MSTP mode and an MSTP root port is not available in the multicast VLAN, the multicast VLAN by default adopts the upstream port as the multicast upstream port.

3, Configure the multicast cascading port.

Run the igmp cascade-port command to configure the cascading port as the multicast cascading port.

4, Configure multicast quick convergence in the case of an MSTP network topology change.

Multicast quick convergence means that the device can quickly join the multicast group through a new upstream port when the MSTP network topology changes. The device can unsolicitedly send the new upstream port the IGMP join packet for an online program so that the device joins all the multicast groups. Or, the device can send the IGMP global leave packet to the upstream port. Then, the upper-layer querier sends a query packet for generating a new multicast forwarding tree.

Run the igmp send global-leave command to enable the function of sending the IGMP global leave packet. When this function is enabled, the device sends the IGMP global leave packet to the upper-layer multicast router. When this function is disabled, the device sends the IGMP join packet to the upper-layer multicast router. By default, the function of sending the IGMP global leave packet is enabled.

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