H3C Technologies H3C SecPath F1000-E - Manual (Page 160)

7
To do... Use the command... Remarks
Display the information of the IPv6
multicast routing table
display multicast ipv6 routing-table
[ ipv6-source-address [ prefix-length ] |
ipv6-group-address [ prefix-length ] |
incoming-interface { interface-type
interface-number | register } |
outgoing-interface { { exclude | include |
match } { interface-type interface-number |
register } } ] *
Available in
any view
Display the RPF route information of the
specified IPv6 multicast source display multicast ipv6 rpf-info
ipv6-source-address [ ipv6-group-address ] Available in
any view
Clear forwarding entries from the IPv6
multicast forwarding table
reset multicast ipv6 forwarding-table
{ { ipv6-source-address [ prefix-length ] |
ipv6-group-address [ prefix-length ] |
incoming-interface { interface-type
interface-number | register } } * | all }
Available in
user view
Clear routing entries from the IPv6
multicast routing table
reset multicast ipv6 routing-table
{ { ipv6-source-address [ prefix-length ] |
ipv6-group-address [ prefix-length ] |
incoming-interface { interface-type
interface-number | register } } * | all }
Available in
user view
CAUTION:
•
The reset command clears the information in the IPv6 multicast routing table or the multicast forwarding
table, and thus may cause transmission failure of IPv6 multicast information.
• When a routing entry is deleted from the IPv6 multicast routing table, the corresponding forwarding
entry will also be deleted from the IPv6 multicast forwarding table.
• When a forwarding entry is deleted from the IPv6 multicast forwarding table, the corresponding routing
entry will also be deleted from the IPv6 multicast routing table.
Troubleshooting IPv6 Multicast Policy Configuration
Abnormal Termination of IPv6 Multicast Data
Symptom
A host sends an MLD report announcing its joining an IPv6 multicast group (G). However, there is no
member information about the IPv6 multicast group (G) on the immediate router. The intermediate router
can receive IPv6 multicast packets successfully, but the packets cannot reach the stub network.
The interface of the intermediate router receives the IPv6 multicast packets, but there is no corresponding
(S, G) entry in the IPv6 PIM routing table.
Analysis
Before forwarding an IPv6 multicast packet, the router decrements the hop limit value in the IPv6 packet
header by 1 and recalculates the checksum. Subsequently, the router forwards the IPv6 multicast packet
to all outgoing interfaces. If the multicast ipv6 minimum-hoplimit command is executed on the
outgoing interfaces, the hop limit value in the IPv6 packet header must be no less than the configured
minimum hop limit value. Otherwise, the packet will be discarded.