HP VAN SDN Controller Administrator Guide

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construct end-to-end paths.
 Deciphering port state changes.
 Generates link events to notify interested listeners.
 Identifies “multi-hop” links between disconnected segments
of the control domain.
 Providing information used by applications to reconfigure
flows when a link goes down.
To avoid sending LLDP discover packet on certain ports such as an
edge port, LinkManager maintains a special list of ports identified as
"Suppressed LLDP Ports". Adding ports to the suppressed LLDP list
can be done using the REST API.
Link Service marks the LLDP TLV it sends by associating a unique ID in
one of the optional LLDP TLVs. This enables Link Service to differentiate
the LLDP messages it generates from the ones generated by the
switches.
As it is possible for non-OpenFlow devices to be present between
OpenFlow switches, Link Service also sends out BDDP messages to
discover "multi-hop links", which refer to a link between two OpenFlow
switches on a path through one or more non-OpenFlow devices.