This parameter specifies the EGP gateway mode of this IP
interface. The two modes are core and non-core. When the
interface is configured in non-core mode, it will advertise
and forward only traffic that originated or is destined
for a local network within its AS. When configured for
this mode, certain EGP Export Route Filters are auto-
matically configured for this interface. When the interface
is configured in Core mode, it can advertise and forward
traffic to networks interior or exterior to its local AS.
The default is Core mode.