Troubleshooting guide

3. Troubleshooting Functional Failures During Operation
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3.12 Communication failures in the IPv6 multicast routing functionality
This section describes actions to be taken when an IPv6 multicast communication failure occurs
on the Switch.
3.12.1 Communication is not possible on the IPv6 PIM-SM networks
If multicast forwarding is not possible in an IPv6 PIM-SM network configuration, isolate the cause
of the problem according to the failure analysis method described below.
The following figure shows an example of an IPv6 PIM-SM network.
Figure 3-17: Example of an IPv6 PIM-SM network
Notes:
• BSR: The router that distributes rendezvous point information. (For details, see the
Configuration Guide.)
• Rendezvous point router: The router that forwards packets to the multicast receivers if
the destination of the packets has not been determined. (For details, see the
Configuration Guide.)
•
first-hop-router: The router that is connected directly to the multicast sender
•
last-hop-router: The router that is connected directly to the multicast receivers
(1) Items checked in common
The following table shows the items checked in common for all the Switches in an IPv6 PIM-SM
network configuration.
Table 3-45: Items checked in common
No. Items to check and commands Action
1 Make sure that the setting for using the multicast
functionality (
ipv6 multicast routing) exists in the
configuration.
show running-config
If the setting for using the multicast functionality does
not exist, modify the configuration.
2 Make sure that the address setting for the loopback
interface exists in the configuration.
show running-config
If the address setting for the loopback interface does
not exist in the configuration, modify the
configuration.
3 Make sure that PIM is running on one or more
interfaces.
show ipv6 pim interface
If PIM is not running, check and modify the
configuration so that PIM runs on at least one of the
interfaces.