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Configuration Guide - IP Multicast

CloudEngine 12800 and 12800E V200R005C10

This document describes the configurations of IP multicast, including IP multicast basics, IGMP, MLD, PIM (IPv4), PIM (IPv6), MSDP, multicast VPN, multicast route management (IPv4), multicast route management (IPv6), IGMP snooping, MLD snooping, static multicast MAC address, multicast VLAN, multicast network management.
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SPT on an IPv4 PIM-DM Network Fails to Be Established

SPT on an IPv4 PIM-DM Network Fails to Be Established

Fault Description

After PIM-DM configuration is complete on a network, user hosts use Internet Group Management Protocol (IGMP) to send requests to group G. However, the user hosts cannot receive any multicast data.

Procedure

  1. Check whether a reachable unicast route to the multicast source is available.

    Run the display ip routing-table command to check whether the switch has a unicast route to the multicast source.

    Multicast routing depends on unicast routing. If the switch does not have a unicast route to the multicast source, configure a unicast routing protocol to dynamically generate a route or configure a unicast static route to the multicast source.

  2. Check whether PIM-DM is enabled on interfaces, especially the reverse path forwarding (RPF) interface towards the multicast source.

    Run the display pim interface command to check PIM information on each interface.

    If no PIM information is displayed on an interface or the PIM mode on the interface is sparse, PIM-DM is not enabled on the interface. Run the pim dm command in the interface view to enable PIM-DM.

  3. Check whether IGMP is enabled on the interface directly connected to the network segment of the user hosts.

    Run the display igmp interface command to check the IGMP configuration on the interface directly connected to the network segment of the user hosts.

    If no information is displayed, IGMP is not enabled on the interface. Run the igmp enable command in the interface view to enable IGMP.

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Updated: 2019-04-20

Document ID: EDOC1100074724

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