User Manual
UMN:CLI
V8102
537
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 V8102 provides the checksum option,
which expands the range of the checksum calculation.
To enable the Cisco checksum option, use the following command.
Command
Mode
Description
ip pim cisco-register-checksum
Global
Enables the Cisco checksum option.
ip pim cisco-register-checksum
group-list
{<1-99> | <1300-1999>
|
WORD
}
Enables the Cisco checksum option for specified mul-
ticast groups.
1-99: IP standard access list
1300-1999: IP standard access list (extended range)
WORD: access list name
To disable the Cisco checksum option, use the following command.
Command
Mode
Description
no
ip
pim
cisco-register-
checksum
Global
Disables the Cisco checksum option.
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
ip pim crp-cisco-prefix
Global
Enables the candidate RP message option for the Cis-
co compatibility.
no ip pim crp-cisco-prefix
Disables the candidate RP message option for the
Cisco compatibility.
Excluding GenID Option
PIM hello messages may contain the generation ID (GenID) in the option fields, which is
a random value for the interface on which the hello message is sent. The GenID is re-
generated whenever PIM forwarding is started or restarted on the interface. It enables
neighbors to quickly detect a
router’s reboot and thus to synchronize RP-set information
and forwarding states by triggering the bootstrap and join/prune messages to the reboot-
ed router. The rebooted router then is able to quickly recover from the reboot.
Some older Cisco
’s routers cannot recognize the GenID option in the hello messages, so
the V8102 provides the exclude-GenID option for the compatibility with the Cisco
’s rout-
ers.
