You can manage bandwidth at both the physical and logical interface level. However, if more than one logical system shares the same physical interface, the interface might become oversubscribed. Oversubscription occurs if the total bandwidth of all separately configured maximum bandwidth values for the interfaces on each logical system exceeds the bandwidth of the physical interface.
When displaying interface bandwidth information, a negative available bandwidth value indicates oversubscription on the interface.
This section discusses the following logical system oversubscription topics: