Rps cannot join spt in ipv6 pim-sm, Symptom, Analysis – H3C Technologies H3C S12500 Series Switches User Manual
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RPS cannot join SPT in IPv6 PIM-SM
Symptom
An RPT cannot be established correctly, or the RPs cannot join the SPT to the IPv6 multicast source.
Analysis
•
As the core of an IPv6 PIM-SM domain, the RPs provide services for specific IPv6 multicast groups.
Multiple RPs can coexist in a network. Make sure that the RP information on all routers is exactly the
same, and a specific group is mapped to the same RP. Otherwise, IPv6 multicast will fail.
•
In the case of the static RP mechanism, the same RP address must be configured on all the routers
in the entire network, including static RPs, by means of the static RP command. Otherwise, IPv6
multicast will fail.
Solution
1.
Use the display ipv6 routing-table command to verify that a route to the RP is available on each
router.
2.
Use the display pim ipv6 rp-info command to verify that the RP information is consistent on all
routers. In the case of inconsistent RP information, configure consistent RP address on all the
routers.
3.
Use the display pim ipv6 rp-info command to verify that the same RP address has been configured
on all the routers throughout the network.
RPT establishment failure or source registration failure in IPv6
PIM-SM
Symptom
C-RPs cannot unicast advertise messages to the BSR. The BSR does not advertise bootstrap messages
containing C-RP information and has no unicast route to any 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 cannot receive the advertisements from the C-RP, and therefore the
bootstrap messages of the BSR will not contain the information about that C-RP.
•
The RP is the core of an IPv6 PIM-SM domain. Make sure that the RP information on all routers is
exactly the same, a specific group is mapped to the same RP, and a unicast route is available to the
RP.
Solution
1.
Use the display ipv6 routing-table command to verify that routes to the RP and the BSR are
available on each router, and that a route is available between the 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
routers in the entire network have a unicast route to the RP.
2.
IPv6 PIM-SM needs the support of the RP and BSR. Use the display pim ipv6 bsr-info command to
verify that the BSR information is available on each router, and then use the display pim ipv6
rp-info command to verify that the RP information is correct.