Configuring Multicast Source Registration - HP MSR2003 Configuration Manual

If the RP-set information is carried in multiple BSMFs, the router updates the RP-set information for the
•
group range after receiving all these BSMFs. The loss of some IP fragments does not result in
dropping of the entire BSM.
The BSM semantic fragmentation function is enabled by default. A device that does not support this
function might regard a fragment as a BSM. Therefore, the device learns only part of the RP-set
information. If such devices exist in the PIM-SM domain, you must disable the BSM semantic
fragmentation function on the C-BSRs.
To disable the BSM semantic fragmentation function:
Step
1. Enter system view.
2. Enter PIM view.
3. Disable the BSM semantic
fragmentation function.
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. To limit the multicast groups to which an RP is
designated, you can configure an ACL to filter register messages. Under either of the following
conditions, the RP sends a register-stop message to the DR to stop the registration process.
The register message of a (S, G) entry is denied by the ACL.
•
• The ACL does not define a deny or permit action for a matching register message.
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.
The RP sends a register-stop message to the source-side DR in either of the following conditions:
The receivers do not receive multicast data addressed to a multicast group through the RP, and the
•
RP stops serving the receivers for the multicast group
• The RP receives multicast data that travels along the SPT.
After receiving the register-stop message, the DR stops sending register messages encapsulated with
multicast data and starts a register-stop timer. Before the register-stop timer expires, the DR sends a null
register message (a register message without encapsulated multicast data) to the RP and starts a register
probe timer. If the DR receives a register-stop message before the register probe timer expires, it resets
its register-stop timer. Otherwise, the DR starts sending register messages with encapsulated data
again.
Command
system-view
pim [ vpn-instance
vpn-instance-name ]
undo bsm-fragment enable
101
Remarks
N/A
N/A
By default, BSM semantic
fragmentation is enabled.