R21xx-HP FlexFabric 11900 IP Multicast Configuration Guide

167
The BSM semantic fragmentation function is enabled by default. A device that does not support this
function might regard a fragment as a BSM and thus learns only part of the RP-set information. Therefore,
if such devices exist in the IPv6 PIM-SM domain, you must disable the BSM semantic fragmentation
function on the C-BSRs.
To disable the BSM semantic fragmentation function:
Ste
p
Command Remarks
1. Enter system view.
system-view
N/A
2. Enter IPv6 PIM view.
ipv6 pim 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.
However, 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.
Configuring IPv6 multicast source registration
In an IPv6 PIM-SM domain, the source-side DR sends register messages to the RP, and these register
messages have different IPv6 multicast source or IPv6 multicast group addresses. You can configure a
filtering rule to filter register messages so that the RP can provide services for specific IPv6 multicast
groups. If the filtering rule denies an (S, G) entry, or if the filtering rule does not define an action for this
entry, the RP sends a register-stop message to the DR to stop the registration process for the IPv6 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 IPv6 multicast source registration:
Ste
p
Command Remarks
1. Enter system view.
system-view
N/A
2. Enter IPv6 PIM view.
ipv6 pim N/A
3. Configure a filtering rule for
register messages.
register-policy acl6-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.