| Description | This entry is used to model two bi-directional cross-connected
interfaces.
Cross-connects can be created through provisioning,
automatically by the network element, dynamically by using
control protocols (e.g. GMPLS), or due to the presence of
protection interfaces.
When creating an entry through provisioning, the following
procedures are used to cross-connect two interfaces:
(1) The manager obtains a unique coifccCcIndex by reading the
coifccCcIndexNext object.
(2) Next, the manager creates a set of one or more rows in the
Cross Connect Table. For a point-to-point connection, one
row is created by the manager. For a point-to-multipoint
connection, one row is created for each leaf to an
unprotected interface, or one row is created for each leaf
to a pair of protected interfaces. Additional rows for
protection interfaces are created automatically by the
agent. Each row is indexed by the ifIndex values of the
two interfaces at the ends of that cross-connection. This
set of rows is identified by a single value of
coifccCcIndex. As each row is created, the agent checks if
the requested topology is supported and also checks for
internal errors in building the cross-connect. The
coifccIfCrossConnectIdentifier values in the corresponding
coifccInterfaceTable rows are filled in by the agent at
this point. The traffic flow is turned on when the manager
sets coifccCcRowStatus to active(1) or createAndGo(4).
A cross-connect identified by a particular value of
coifccCcIndex is released by setting coifccCcRowStatus of all
rows identified by this value of coifccCcIndex, other than the
rows with a coifccCcKind value of 'protection', to destroy(6).
The agent may release associated resources, and the
coifccIfCrossConnectIdentifier values in the corresponding
coifccInterfaceTable are removed. Note that a situation when
only a subset of the associated rows are deleted corresponds to
a topology change.
At the discretion of the agent, a cross-connect may be
reconfigured by adding and/or deleting leafs to/from the
topology as per the cross-connect establishment/retirement
guidelines described below.
Each leaf is added by creating a row with the same value of
coifccCcIndex in this table. Each leaf is deleted by deleting
a row with the same value of coifccCcIndex in the table. To
delete an entire point-to-multipoint connection, all entries
with the same coifccCcIndex value must be deleted. |