H3C Technologies H3C S12500-X Series Switches - Manual (Page 200)

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Solution
1. Use display current-configuration to verify the IPv6 multicast forwarding boundary settings. Use
ipv6 multicast boundary to change the multicast forwarding boundary settings to make the IPv6
multicast packet able to cross the boundary.
2. Use display current-configuration to verify the IPv6 multicast data filter. Change the ACL rule
defined in the source-policy command so that the source/group address of the IPv6 multicast data
can pass ACL filtering.
An RP cannot join an SPT in IPv6 PIM-SM
Symptom
An RPT cannot be correctly built, or an RP cannot join the SPT toward the IPv6 multicast source.
Analysis
• RPs are the core of an IPv6 PIM-SM domain. An RP provides services for a specific IPv6 multicast
group, and multiple RPs can coexist on a network. Make sure the RP information on all routers is
exactly the same to map a specific IPv6 multicast group to the same RP. Otherwise, IPv6 multicast
forwarding fails.
• If a static RP is configured, use the same static RP configuration on all routers on the entire network.
Otherwise, IPv6 multicast forwarding fails.
Solution
1. Use display ipv6 routing-table to verify that an IPv6 unicast route to the RP is available on each
router.
2. Use display ipv6 pim rp-info to verify that the dynamic RP information is consistent on all routers.
3. Use display ipv6 pim rp-info to verify that the same static RPs are configured on all routers on the
network.
An RPT cannot be built or IPv6 multicast source registration fails
in IPv6 PIM-SM
Symptom
The C-RPs cannot unicast advertisement messages to the BSR. The BSR does not advertise BSMs
containing C-RP information and has no IPv6 unicast route to any C-RP. An RPT cannot be correctly
established, or the source-side DR cannot register the IPv6 multicast source with the RP.
Analysis
• The C-RPs periodically send advertisement messages to the BSR by unicast. If a C-RP has no IPv6
unicast route to the BSR, it cannot send advertisement messages to the BSR, and the BSR cannot
advertise BSMs containing the information of the C-RP.
• If the BSR does not have an IPv6 unicast route to a C-RP, it discards the advertisement messages
from the C-RP. Therefore, the BSR cannot advertise BSMs containing the information of the C-RP.
• RPs are the core of an IPv6 PIM-SM domain. Make sure the RP information on all routers is exactly
the same to map a specific IPv6 multicast group to the same RP, and that an IPv6 unicast route to the
RP are available on the routers.