Usage Guidelines
From within bundle configuration mode you can configure the characteristics and attributes of the bundle and its members, such as the encapsulation type for all virtual circuits (VCs) in the bundle, the bundle management parameters, the service type, and so on. Attributes and parameters you configure in bundle configuration mode are applied to all VC members of the bundle.
VCs in a VC bundle are subject to the following configuration inheritance rules (listed in order of next highest precedence):
VC configuration in bundle-vc mode
Bundle configuration in bundle mode
Subinterface configuration in subinterface mode
To display status on bundles, use the show atm bundle and show atm bundle statistics commands.
Refer
http://www.cisco.com/en/US/products/sw/iosswrel/ps1831/products_command_reference_chapter09186a0080080794.html#1025835
HTH
