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To configure a PIM domain border:
Step
Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enter interface view.
interface
interface-type
interface-number
N/A
3.
Configure a PIM domain
border.
pim bsr-boundary
By default, an interface is not a
PIM domain border.
Disabling BSM semantic fragmentation
BSM semantic fragmentation enables a BSR to split a BSM into multiple BSM fragments (BSMFs) if
the BSM exceeds the MTU. In this way, a non-BSR router can update the RP-set information for a
group range after receiving all BSMFs for the group range. The loss of one BSMF only affects the
RP-set information of the group ranges that the fragment contains.
If the BIDIR-SM domain contains a device that does not support this feature, you must disable this
feature on all C-BSRs. If you do not disable this feature, such a device regards a BSMF as a 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 PIM view.
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 PIM neighbor, semantic fragmentation is performed
according to the MTU of the interface that sends the BSMs.
Disabling BSM forwarding out of incoming interfaces
By default, the device is enabled to forward BSMs out of incoming interfaces. This feature avoids
devices in the BIDIR-PIM domain might from failing to receive BSMs due to inconsistent routing
information. To reduce traffic, you can disable this feature if all the devices have consistent routing
information.
To disable the device to forward BSMs out of incoming interfaces:
Step
Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enter PIM view.
pim
[
vpn-instance
vpn-instance-name
]
N/A
3.
Disable the device to forward
BSMs out of incoming
interfaces.
undo bsm-reflection
enable
By default, the device is enabled
to forward BSMs out of incoming
interfaces.