H3C Technologies H3C SecPath F1000-E - Manual (Page 223)

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Step3 Check that the RPF neighbor is an IPv6 PIM neighbor. Use the display pim ipv6 neighbor
command to view the PIM neighbor information.
Step4 Check that IPv6 PIM and MLD are enabled on the interfaces directly connecting to the IPv6 multicast
source and to the receiver.
Step5 Check that the same IPv6 PIM mode is enabled on related interfaces. Use the display pim ipv6
interface verbose command to check whether the same PIM mode is enabled on the RPF interface
and the corresponding interface of the RPF neighbor router.
Step6 Check that the same IPv6 PIM mode is enabled on all the routers in the entire network. Use the display
current-configuration command to check the IPv6 PIM mode information on each interface. Make
sure that the same IPv6 PIM mode is enabled on all the routers: IPv6 PIM-SM on all routers, or IPv6
PIM-DM on all routers.
IPv6 Multicast Data Abnormally Terminated on an Intermediate
Router
Symptom
An intermediate router can receive IPv6 multicast data successfully, but the data cannot reach the last
hop router. An interface on the intermediate router receives data but no corresponding (S, G) entry is
created in the IPv6 PIM routing table.
Analysis
• When a router receives an IPv6 multicast packet, it decrements the hop limit value of the IPv6
multicast packet by 1 and recalculates the checksum value. The router then forwards the packet to
all outgoing interfaces. If the multicast ipv6 minimum-hoplimit command is configured on
the outgoing interfaces, the hop limit value of the packet must be larger than the configured
minimum hop limit value; otherwise, the packet will be discarded.
• If an IPv6 multicast forwarding boundary has been configured through the multicast ipv6
boundary command, any IPv6 multicast packet will be kept from crossing the boundary, and
therefore no routing entry can be created in the IPv6 PIM routing table.
• In addition, the source-policy command is used to filter received IPv6 multicast packets. If the
IPv6 multicast data fails to pass the ACL rule defined in this command, IPv6 PIM cannot create the
route entry, either.
Solution
Step1 Check the minimum hop limit value for IPv6 multicast forwarding. Use the display
current-configuration command to check the minimum hop limit value for multicast forwarding.
Increase the hop limit value or remove the multicast ipv6 minimum-hoplimit command
configured on the interface.
Step2 Check the IPv6 multicast forwarding boundary configuration. Use the display
current-configuration command to check the IPv6 multicast forwarding boundary settings. Use the
multicast ipv6 boundary command to change the IPv6 multicast forwarding boundary settings.
Step3 Check the IPv6 multicast filter configuration. Use the display current-configuration command to
check the IPv6 multicast filter configuration. Change the IPv6 ACL rule defined in the source-policy
command so that the source/group address of the IPv6 multicast data can pass ACL filtering.