This object represent the connection id for
the adjacency associated with this forwarding
Element List.
The value of this object will be irrelevant and will
be set to zero if the forwarding element list doesn't
contain an adjacency forwarding element.
In cases where cefFESelectionAdjLinkType, interface
and the next hop address are not able to uniquely
define an adjacency entry (e.g. ATM and Frame Relay
Bundles), this object is a unique identifier
to differentiate between these adjacency entries.