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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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Configuring IPv4 PIM BFD

Configuring IPv4 PIM BFD

Pre-configuration Tasks

Before configuring PIM BFD, complete the following tasks:


Normally, if the current DF is faulty on the shared network segment, other PIM neighbors participate in DF election after the neighbor relationship times out. Consequently, multicast data transmission is interrupted. The interruption period, usually in seconds, is longer than or equal to the timeout interval of the neighbor relationship.

BFD can detect faults in milliseconds. BFD is used to detect the status of PIM neighbors on the shared network segment. When detecting a fault on the peer device, BFD reports the fault to the PIM module. The PIM module triggers a new DF election immediately instead of waiting the timeout of the neighbor relationship. This shortens the interruption time of multicast data transmission and improves reliability of the multicast network.

Default Settings

Table 4-30 lists default settings of control parameters for PIM BFD messages.

Table 4-30 Default settings of control parameters for PIM BFD messages
Parameter Default Setting

Minimum sending interval

1000 ms

Minimum receiving interval

1000 ms

Local detection multiplier



  1. Run system-view

    The system view is displayed.

  2. Run interface interface-type interface-number

    The interface view is displayed.

  3. On an Ethernet interface, run undo portswitch

    The interface is switched to Layer 3 mode.

    By default, an Ethernet interface works in Layer 2 mode.

    The mode switching function takes effect when the interface only has attribute configurations (for example, shutdown and description configurations). Alternatively, if configuration information supported by both Layer 2 and Layer 3 interfaces exists (for example, mode lacp and lacp system-id configurations), no configuration that is not supported after the working mode of the interface is switched can exist. If unsupported configurations exist on the interface, delete the configurations first and then run the undo portswitch command.


    If many Ethernet interfaces need to be switched to Layer 3 mode, run the undo portswitch batch interface-type { interface-number1 [ to interface-number2 ] } &<1-10> command in the system view to switch these interfaces to Layer 3 mode in batches.

  4. For a Layer 3 sub-interface, run the following commands to configure termination of single-tagged packets on it.
    1. Run quit

      Return to the system view.

    2. Run interface interface-type interface-number.subinterface-number

      The Layer 3 sub-interface view is displayed.

      The subinterface-number parameter must specify a Layer 3 sub-interface number on an Ethernet interface that has been switched to the Layer 3 mode.

    3. Run dot1q termination vid vid

      Termination of Dot1q packets is configured on the Layer 3 sub-interface.

      By default, the termination of Dot1q packets is not configured on a Layer 3 sub-interface.

  5. Run pim bfd enable

    PIM BFD is enabled.

  6. (Optional)Run pim bfd { min-tx-interval tx-value | min-rx-interval rx-value | detect-multiplier multiplier-value } *

    This operation is performed to set the minimum interval for sending the PIM BFD messages, the minimum interval for receiving the PIM BFD messages, and the local detection multiplier.

  7. Run commit

    The configuration is committed.

Verifying the Configuration

After PIM BFD is configured, you can run the following commands to check information about the PIM BFD session.

  • display pim bfd session statistics

  • display pim bfd session [ interface interface-type interface-number | neighbor neighbor-address ] *

Updated: 2019-04-20

Document ID: EDOC1100074724

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