Some Downstream Ipv6 Pim-Capable Routers Cannot Receive Multicast Data - HP A8800 Configuration Manual

Solution
1. Use the display current-configuration command to check the status of MLD snooping and IPv6 PIM
snooping.
2. If MLD snooping is not enabled, enter system view and use the mld-snooping command to enable
MLD snooping globally. Then, enter VLAN view and use the mld-snooping enable and
pim-snooping ipv6 enable commands to enable MLD snooping and IPv6 PIM snooping in the
VLAN.
3. If IPv6 PIM snooping is not enabled, enter VLAN view and use the pim-snooping ipv6 enable
command to enable IPv6 PIM snooping in the VLAN.
Some downstream IPv6 PIM-capable routers cannot receive
multicast data
Symptom
In a network with fragmented join/prune messages, some downstream IPv6 PIM-capable routers cannot
receive multicast data.
Analysis
IPv6 PIM snooping cannot reassemble messages, and it cannot maintain the status of downstream
routers that the join/prune message fragments carry. To ensure the normal operation of the system, IPv6
PIM snooping must broadcast join/prune message fragments in the VLAN. However, if the VLAN has an
IPv6 PIM-capable router that has the join suppression function enabled, the broadcast join/prune
message fragments might suppress the join messages of other IPv6 PIM-capable routers in the VLAN. As
a result, some IPv6 PIM-capable routers cannot receive the multicast data addresses to a specific
multicast group because their join messages are suppressed. To solve this problem, disable the join
suppression function on all IPv6 PIM-capable routers that connect to the IPv6 PIM snooping-capable
router in the VLAN.
Solution
1. Use the pim ipv6 hello-option neighbor-tracking command to enable the neighbor tracking
function on the interfaces of IPv6 PIM-capable routers that connect to the IPv6 PIM
snooping-capable router.
2. If an IPv6 PIM-capable router cannot be enabled with the neighbor tracking function, be sure to
disable IPv6 PIM snooping on the IPv6 PIM snooping-capable router.
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