HP VSR1000 Configuration Manual page 297

Step
Enter IPv6 PIM view.
2.
Configure a C-BSR.
3.
(Optional.) Configure a BSR
4.
policy.
Configuring an IPv6 PIM domain border
An IPv6 PIM domain border determines the transmission boundary of bootstrap messages.
Bootstrap messages cannot cross the domain border in either direction. A number of IPv6 PIM
domain border interfaces partition a network into different IPv6 PIM-SM domains.
To configure an IPv6 PIM border domain:
Step
Enter system view.
1.
Enter interface view.
2.
Configuring an IPv6 PIM
3.
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 IPv6 PIM-SM 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 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
Enter system view.
1.
Enter IPv6 PIM view.
2.
Disable BSM semantic
3.
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 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
Command
ipv6 pim [ vpn-instance
vpn-instance-name ]
c-bsr ipv6-address [ scope
scope-id ] [ hash-length
hash-length | priority priority ] *
bsr-policy ipv6-acl-number
Command
system-view
interface interface-type
interface-number
ipv6 pim bsr-boundary
Command
system-view
ipv6 pim [ vpn-instance
vpn-instance-name ]
undo bsm-fragment enable
289
Remarks
N/A
By default, no C-BSRs exist.
By default, no BSR policies exist,
and all bootstrap messages are
regarded as legal.
Remarks
N/A
N/A
By default, an interface is not an
IPv6 PIM domain border.
Remarks
N/A
N/A
By default, BSM semantic
fragmentation is enabled.