In which command would you find the IPv6 interface brief information?

The command that provides IPv6 interface brief information is "show ipv6 int brief." This command is specifically designed to display a concise summary of the IPv6 addresses configured on interfaces, along with their operational status (up or down) and protocol status. The output is straightforward and gives a quick view of which interfaces are using IPv6 and helps in troubleshooting connectivity issues related to IPv6.

This command is particularly useful for network administrators who want to quickly ascertain which interfaces are configured for IPv6, without diving into more detailed output that can be provided by other commands. It notably contrasts with other commands that focus on different aspects of network configuration or diagnostics.

For instance, "show ipv6 summary" would not display interface status but rather summarize globally applied IPv6 configurations. Similarly, "show ip interface brief" is limited to displaying IPv4 interface brief information and does not include any details about IPv6. The command "show interface summary" tends to offer a broader summary of interface statistics without the specific focus on IPv6.