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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 IPv6 PIM BFD

Configuring IPv6 PIM BFD

Pre-configuration Tasks

Before configuring IPv6 PIM BFD, complete the following tasks:


Normally, if the current DF on a shared network segment is faulty, other IPv6 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.

Bidirectional Forwarding Detection (BFD) can detect faults in milliseconds, and it can be used to detect the status of IPv6 PIM neighbors on a shared network segment. When detecting a fault on the peer device, BFD reports the fault to the IPv6 PIM module. The IPv6 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 5-22 lists default settings of control parameters for IPv6 PIM BFD messages.

Table 5-22 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. Run pim ipv6 bfd enable

    IPv6 PIM BFD is enabled.

  5. (Optional)Run pim ipv6 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 IPv6 PIM BFD messages, the minimum interval for receiving the IPv6 PIM BFD messages, and the local detection multiplier.

  6. Run commit

    The configuration is committed.

Verifying the Configuration

After IPv6 PIM BFD is configured, you can run the following commands to check information about the IPv6 PIM BFD session.

  • display pim ipv6 bfd session statistics

  • display pim ipv6 bfd session [ interface interface-type interface-number | neighbor ipv6-link-local-address ] *

Updated: 2019-04-20

Document ID: EDOC1100074724

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