For troubleshooting multicast issues, which command would be most pertinent?

The command that is most pertinent for troubleshooting multicast issues is "show ipv6 multicast." This command provides detailed information about the multicast groups that an IPv6-capable device is participating in and helps identify the multicast routing states, including the locally joined groups and the interfaces associated with them.

When dealing with multicast traffic, understanding which multicast groups are active and how they are being forwarded is crucial for diagnosing issues such as connectivity problems or routing discrepancies related to multicast traffic. This command helps network administrators pinpoint any misconfigurations or problems in the multicast setup that may be affecting data transmission.

The other commands listed have different focuses. For instance, commands like "show protocols" and "show running-config" provide an overview of configured protocols and the current device configuration respectively but do not directly give insight into multicast traffic and its handling. The "show ip route" command is valuable for understanding unicast routing decisions but does not specifically address multicast groups or their statuses.