H3C Technologies H3C S12500-X Series Switches - Manual (Page 89)

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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 BSM semantic
fragmentation function.
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.
Configuring multicast source registration
In a PIM-SM domain, the source-side DR sends register messages to the RP, and these register messages
have different multicast source or group addresses. You can configure a filtering rule to filter register
messages so that the RP can provide services for specific multicast groups. If the filtering rule denies an
(S, G) entry, or if the filtering rule does not define the action for this entry, the RP sends a register-stop
message to the DR to stop the registration process for the multicast data.
In view of information integrity of a register message in the transmission process, you can configure the
device to calculate the checksum based on the entire register message. However, to reduce the workload
of encapsulating data in register messages and for the sake of interoperability, do not use this checksum
calculation method.
To configure multicast source registration:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter PIM view.
pim [ vpn-instance
vpn-instance-name ]
N/A
3. Configure a filtering rule for
register messages.
register-policy acl-number
By default, no register filtering rule
exists.
4. Configure the device to
calculate the checksum based
on the entire register
message.
register-whole-checksum
By default, the device calculates
the checksum based on the header
of a register message.
Configuring switchover to SPT
CAUTION:
If the device is an RP, disabling switchover to SPT might cause multicast traffic forwarding failures on the
source-side DR. When disabling switchover to SPT, be sure you fully understand its impact on your
network.
To configure the switchover to SPT: