H3C Technologies H3C S12500 Series Switches - Manual (Page 24)

17
LLDP frame matching
LLDP is used to perform topology discovery in an OpenFlow network. LLDP must be enabled globally on
a device. A switch sends a LLDP frame to the controller through the packet-in message when the following
conditions exist:
• The port that receives the LLDP frame from the controller belongs to an OpenFlow instance.
• The flow tables in the OpenFlow instance have a flow entry that matches the LLDP frame (the output
port is the Controller reserved port).
Flow table modification messages restrictions
The flow table modification messages have the following restrictions for the table-miss flow entry and
common flow entries:
• Table-miss flow entry
{
The controller deploys the table-miss flow entry (the action is Drop) to an OpenFlow instance
after the OpenFlow instance is activated.
{
The controller cannot query the table-miss flow entry through Multipart messages.
{
The controller cannot modify the table-miss flow entry through the Modify request. The controller
can only modify the table-miss flow entry through the Add request.
{
The controller can modify or delete the table-miss flow entry only through the strict version of the
Modify or Delete request. The controller cannot modify or remove the table-miss flow entry
through the non-strict version of the Modify or Delete request despite that the match fields are
wildcarded.
• Common flow entries
The controller cannot modify or remove all common flow entries through the non-strict version of
the Modify or Delete request despite that the match fields are wildcarded.