3Com Switch 8800 Advanced Software V5 Configuration Guide

Troubleshooting IPv6 PIM Configuration 707
C-RP. An RPT cannot be established correctly, or the DR cannot perform source
register with the RP.
Analysis
■ C-RPs periodically send advertisement messages to the BSR by unicast. If a C-RP
does not have a route to the BSR, the BSR will be unable to receive the
advertisements from the C-RP, and therefore will not advertise bootstrap
messages.
■ The RP is the core of an IPv6 PIM-SM domain. Make sure that the RP
information on all devices is exactly the same, a specific group G is mapped to
the same RP, and a unicast route is available to the RP.
Solution
1 Check whether routes to C-RPs, the RP and the BSR are available. Use the display
ipv6 routing-table command to check whether routes are available on each
device to the RP and the BSR, and whether a route is available between the C-RP
and the BSR. Make sure that each C-RP has a unicast route to the BSR, the BSR has
a unicast route to each C-RP, and all the devices in the entire network have a
unicast route to the RP.
2 Check the RP and BSR information. IPv6 PIM-SM needs the support of the RP and
BSR. Use the display pim ipv6 bsr-info command to check whether the BSR
information is available on each device, and then use the display pim ipv6
rp-info command to check whether the RP information is correct.
3 View the IPv6 PIM neighboring relationships. Use the display pim ipv6 neighbor
command to check whether the normal neighboring relationships have been
established among the devices.