Limitations of the feature
- The IP unnumbered interfaces feature does not support IPv6 unnumbered interfaces.
- Interfaces that are configured as unnumbered can neither take other addresses nor be part of a bridge.
- Only data plane interfaces and vifs can be configured as unnumbered interfaces.
- The preferred donor interfaces are loopback interfaces.
- The feature may affect Protocol Independent Multicast (PIM) and Internet Group Management Protocol (IGMP).