| Description | For outside links and uplinks, this attribute contains the
peer group identifier of the lowest level common Peer Group
in the ancestry of the neighboring node and the node within
the local switching system. The value of this attribute
takes on a value determined by the Hello exchange of
hierarchical information that occurs between the two
lowest-level border nodes. When the common peer group has
not yet been identified, this attribute is set to zero.
For horizontal links or when the link type is not yet
known, this attribute is set to all zeros. |