HP MSR1002-4 Configuration Manual page 125

Step
4. (Optional.) Configure a BSR
policy.
Configuring a PIM domain border
A PIM domain border determines the transmission boundary of bootstrap messages. Bootstrap
messages cannot cross the domain border in either direction. A number of PIM domain border
interfaces partition a network into different BIDIR-PIM domains.
To configure a PIM domain border:
Step
1. Enter system view.
2. Enter interface view.
3. Configure 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
1. Enter system view.
2. Enter PIM view.
3. Disable
fragmentation.
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 from sending BSMs out of incoming interfaces:
Command
bsr-policy ipv4-acl-number
Command
system-view
interface
interface-number
pim bsr-boundary
Command
system-view
pim
vpn-instance-name ]
BSM semantic
undo bsm-fragment enable
interface-type
[ vpn-instance
116
Remarks
By default, no BSR policies exist,
and all bootstrap messages are
regarded legal.
Remarks
N/A
N/A
By default, an interface is not a
PIM domain border.
Remarks
N/A
N/A
By default, BSM
fragmentation is enabled.
semantic