3Com Switch 8800 Advanced Software V5 Configuration Guide

690 CHAPTER 46: IPV6 PIM CONFIGURATION
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■ The commands introduced in this section are to be configured on C-RPs.
■ For the configuration of other timers in IPv6 PIM-SM, refer to “Configuring IPv6
PIM Common Timers” on page 694.
Configuring IPv6
PIM-SM Register
Messages
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 an (S, G) entry
is denied by the filtering rule, or the action for this entry is not defined in the
filtering rule, 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, this method of checksum
calculation is not recommended.
When receivers stop receiving data addressed to a certain IPv6 multicast group
through the RP (that is, the RP stops serving the receivers of a specific IPv6
multicast group), or when the RP formally starts receiving IPv6 multicast data from
the IPv6 multicast source, the RP sends a register-stop message to the source-side
DR. Upon receiving this message, the DR stops sending register messages
encapsulated with IPv6 multicast data and enters the register suppression state.
In a probe suppression cycle, the DR can send a null register message (a register
message without multicast data encapsulated), a certain length of time defined by
the probe time before the register suppression timer expires, to the RP to indicate
that the multicast source is active. When the register suppression timer expires, the
DR starts sending register messages again. A smaller register suppression timeout
setting will cause the RP to receive bursting IPv6 multicast data more frequently,
while a larger timeout setting will result in a larger delay for new receivers to join
the IPv6 multicast group they are interested in.
Follow these steps to configure IPv6 PIM-SM register messages:
Configure the C-RP-Adv
interval
c-rp advertisement-interval
interval
Optional
60 seconds by default
Configure C-RP timeout time c-rp holdtime interval Optional
150 seconds by default
To do... Use the command... Remarks
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