3Com Switch 8800 Advanced Software V5 Configuration Guide

Troubleshooting IPv6 Multicast Policy Configuration 521
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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
Multicast Data Fails to
Reach Receivers
Symptom
The multicast data can reach some devices but fails to reach the last-hop device.
Analysis
If a multicast forwarding boundary is configured on a VLAN interface through the
multicast ipv6 boundary command, any multicast packet will be kept from
crossing the boundary.
Solution
1 Use the display pim ipv6 routing-table command to check whether the
corresponding (S, G) entries exist on the device. If so, the device has received the
multicast data; otherwise, the device has not received the data..
2 Use the display multicast ipv6 boundary command to view the multicast
boundary information on the interfaces. .Use the multicast ipv6 boundary
command to change the multicast forwarding boundary setting.
3 In the case of IPv6 PIM-SM, check the BSR and RP information..
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
To do... Use the command... Remarks