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If the IPv6 BIDIR-PIM domain contains a device that does not support this feature, you must disable
BSM semantic fragmentation on all C-BSRs. If you do not disable this feature, such a device regards
a BSMF as an entire BSM and updates the RP-set information each time it receives a BSMF. It
learns only part of the RP-set information, which further affects the RP election.
To disable BSM semantic fragmentation:
Step
Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enter IPv6 PIM view.
ipv6 pim
[
vpn-instance
vpn-instance-name
]
N/A
3.
Disable BSM semantic
fragmentation.
undo bsm-fragment
enable
By default, BSM semantic
fragmentation is enabled.
NOTE:
Generally, a BSR performs BSM semantic fragmentation according to the MTU of its BSR interface.
For BSMs originated due to learning of a new IPv6 PIM neighbor, semantic fragmentation is
performed according to the MTU of the interface that sends the BSMs.
Disabling the device from forwarding BSMs out of their incoming interfaces
By default, the device forwards BSMs out of their incoming interfaces to avoid the situation that some
devices cannot receive the BSMs because of inconsistent routing information. This results in
duplicated traffic. If the devices have consistent routing information, you can disable the device to
forward BSMs out of their incoming interfaces to reduce the duplicated traffic.
To disable the device from forwarding BSMs out of their incoming interfaces:
Step
Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enter IPv6 PIM view.
ipv6 pim
[
vpn-instance
vpn-instance-name
]
N/A
3.
Disable the device from
forward BSMs out of their
incoming interfaces.
undo bsm-reflection
enable
By default, the device forwards
BSMs out of their incoming
interfaces.
Configuring IPv6 PIM-SSM
IPv6 PIM-SSM requires MLDv2 support. Enable MLDv2 on IPv6 PIM routers that connect to
multicast receivers.
IPv6 PIM-SSM configuration task list
Tasks at a glance
(Required.)
Configuring the IPv6 SSM group range
Configuring common IPv6 PIM features