H3C Technologies H3C S10500 Series Switches - Manual (Page 398)

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NOTE:
You can configure the hash mask length and C-BSR priority globally and in an IPv6 admin-scope zone.
• The values configured in the IPv6 admin-scope zone have preference over the global values.
• If you do not configure these parameters in the IPv6 admin-scope zone, the corresponding global values
will be used.
For configuration of global C-BSR parameters, see “ Configuring C-BSR parameters globally .”
Configuring IPv6 multicast source registration
Within 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 serve 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
will send a register-stop message to the DR to stop the registration process for the IPv6 multicast data.
In view of information integrity of register messages in the transmission process, you can configure the
device to calculate the checksum based on the entire register messages. However, to reduce the
workload of encapsulating data in register messages and for the sake of interoperability, H3C does not
recommend this method of checksum calculation.
When receivers stop receiving data addressed to a certain IPv6 multicast group through the RP (that is,
the RP stops serving the receivers of that IPv6 multicast group), or when the RP starts receiving IPv6
multicast data from the IPv6 multicast source along the SPT, the RP sends a register-stop message to the
source-side DR. After receiving this message, the DR stops sending register messages encapsulated with
IPv6 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 multicast data) to the RP. If the DR receives a
register-stop message during the register probe time, it will reset its register-stop timer. Otherwise, the DR
starts sending register messages with encapsulated data again when the register-stop timer expires.
The register-stop timer is set to a random value chosen uniformly from the interval (0.5 times
register_suppression_time, 1.5 times register_suppression_time) minus register_probe_time.
Configure a filtering rule for register messages on all C-RP routers, and configure them to calculate the
checksum based on the entire register messages. Configure the register suppression time and the register
probe time on all routers that might become IPv6 source-side DRs.
Follow these steps to configure register-related parameters:
To do... Use the command... Remarks
Enter system view system-view —
Enter IPv6 PIM view pim ipv6 —
Configure a filtering rule for
register messages
register-policy acl6-number
Optional
No register filtering rule by default
Configure the device to calculate
the checksum based on the entire
register messages
register-whole-checksum
Optional
Based on the header of register
messages by default
Configure the register suppression
time register-suppression-timeout
interval Optional
60 seconds by default