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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:

  • Configure an IPv6 unicast routing protocol to ensure normal unicast routing on the network.
  • Enable BFD globally.
  • Enable IPv6 PIM-SM.


On a PIM network, changes of link status between PIM neighbors will restart some PIM mechanisms, such as DR election or Assert winner election. For example, when the DR on a shared network segment fails, PIM neighbors on the network segment trigger DR re-election only when the PIM neighbor relationships time out. Multicast data transmission is interrupted before a new DR is elected. The multicast service interruption time is longer than or equal to the neighbor relationship timeout interval, and is usually several seconds.

IPv6 PIM BFD can detect link status changes on a shared network segment in milliseconds, enabling PIM devices to rapidly respond to failures of PIM neighbors. If an IPv6 PIM BFD-capable interface does not receive any BFD packets from the DR within the detection interval, it considers that the DR has failed. Then BFD reports the session status to the route management (RM) module, which then reports the link status change to the PIM module. After receiving the notification, the PIM module triggers DR re-election immediately, without waiting for timeout of the neighbor relationship. This mechanism reduces the multicast service interruption time and improves reliability of multicast data transmission.

IPv6 PIM BFD applies to the assert election on a shared network segment, and can quickly respond to faults on the assert winner interface.

Default Settings

Table 5-15 lists default settings of control parameters for IPv6 PIM BFD packets.

Table 5-15 Default settings of control parameters for IPv6 PIM BFD packets
Parameter Default Setting

Sending interval

1000 ms

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 } *

    The parameters of IPv6 PIM BFD are set.

    This operation is performed to set the interval for sending the IPv6 PIM BFD packets, the interval for receiving the IPv6 PIM BFD packets, 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 PIM IPv6 BDF 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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