Rps Cannot Join The Spt In Ipv6 Pim-Sm - HP A8800 Configuration Manual

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 filters received IPv6 multicast packets. If the IPv6 multicast
•
data fails to pass the IPV6 ACL rule defined in this command, IPv6 PIM cannot create the route entry,
either.
Solution
1. Use the display current-configuration command to check the minimum hop limit value for multicast
forwarding. Increase the hop limit value or cancel the configuration of the multicast ipv6
minimum-hoplimit command on the interface.
2. Use the display current-configuration command to verify the IPv6 multicast forwarding boundary
settings. Use the multicast ipv6 boundary command to change the IPv6 multicast forwarding
boundary settings.
3. Use the display current-configuration command to verify 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.

RPs cannot join the 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 serves 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 dynamic RP information is consistent
on all routers. In 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.
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