Family Flags

The Family flags field, which provides information about the protocol family on the logical interface, displays one or more of the following values:

DCU—Destination class usage is enabled.
Dest-route-down—The software detected that the link is down and has stopped forwarding the link's interface routes.
Down—Protocol is inactive.
Is-Primary—Interface is the primary one for the protocol.
Mac-Validate-Loose—Interface is enabled with loose MAC address validation.
Mac-Validate-Strict—Interface is enabled with strict MAC address validation.
MTU-Protocol-Adjusted—The effective MTU is not the configured value in the software.
No-Redirects—Protocol redirects are disabled.
Primary—Interface can be considered for selection as the primary family address.
Protocol-Down—Protocol failed to negotiate correctly.
SCU-in—Interface is configured for source class usage input.
SCU-out—Interface is configured for source class usage output.
Unnumbered—Protocol family is configured for unnumbered Ethernet. An unnumbered Ethernet interface borrows an IPv4 address from another interface, which is referred to as the donor interface.
Up–Protocol is configured and operational.
uRPF—Unicast Reverse Path Forwarding is enabled.