User Manual
UMN:CLI
V8102
585
11.3.7
IPv6 Cisco
’s Router Interoperability
11.3.7.1
Register Message Checksum
When a multicast source registers with the RP, the DR encapsulates the multicast traffic
from the source in the PIM register message, and unicasts it to the RP. The standard PIM
protocol specifies that the checksum field in the register message contains the checksum
for the entire register message excluding the data portion, the encapsulated multicast traf-
fic.
The Cisco
’s routers, however, validate the checksum for the whole register message in-
cluding the data portion, resulting in incompatibility with the standard-based routers. To
guarantee compatibility with the Cisco
’s routers, the system provides the checksum op-
tion, which expands the range of the checksum calculation.
To enable the Cisco checksum option, use the following command.
Command
Mode
Description
ipv6
pim
cisco-register-
checksum
Global
Enables the Cisco checksum option.
ipv6
pim
cisco-register-
checksum group-list
WORD
Enables the Cisco checksum option for specified mul-
ticast groups.
WORD: IPv6 access list name <1-99>
To disable the Cisco checksum option, use the following command.
Command
Mode
Description
no
ipv6
pim
cisco-register-
check-sum
Global
Disables the Cisco checksum option.
no
ipv6
pim
cisco-register-
check-sum group-list
WORD
11.3.7.2
Candidate RP Message
Some Cisco
’s BSRs do not comply with the BSR standards; they do not accept candidate
RPs with a group prefix number of zero. You can configure the router to send candidate
RP messages with the option for the compatibility with the Cisco
’s BSR.
To enable the candidate RP message option for the Cisco compatibility, use the following
command.
Command
Mode
Description
ipv6 pim crp-cisco-prefix
Global
Enables the candidate RP message option for the Cis-
co compatibility.
no ipv6 pim crp-cisco-prefix
Disables the candidate RP message option for the
Cisco compatibility.
