SDN Controller Programming Guide

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Add switch port to LLDP suppressed list

void addToSuppressLLDPs(DataPathId dpid, BigPortNumber port);

Remove a switch port from the LLDP suppressed list

void removeFromSuppressLLDPs(DataPathId dpid, BigPortNumber port);

void addListener(LinkListener listener);

Unregister from getting the link discovery events

void removeListener(LinkListener listener);

Topology Manager

Topology Manager provides topology information of the control domain. It also facilitates shortest

path traversals through the control domain by way of computing low cost next hops between any

two elements in the control domain. Topology Manager computes the clusters and broadcast tree

to avoid loops and broadcast storms.

 Provides a list of discovered ports on a given switch.

 Indicates whether a switch port is an edge port (connection point) or part of a link.

 indicate whether a port is in a blocked or open state by determining whether ingress

broadcast traffic is allowed through the port

 Verifies if a path exists between two nodes.

 Identifies the shortest path between two nodes.

 Provides enumeration of the grouping of switches into clusters of strongly connected nodes.

 For a given switch provides cluster details it belongs.

Topology manager provides notifications to subscribed applications on changes in its broadcast

tress and cluster, intelligent applications can be developed which takes proactive measures by way

of subscribing for these topology re-computed notifications

Services published by Topology Service

 Given two switches (s1, s2) this can indicate if they can be reached via directly connected

paths

 For a given switch {s1}, can provide the list of ports that this service has discovered

 For two switches {s1, s2}, the service can indicate if they are "strongly connected" i.e form

part of same cluster.

 For a given {switch, port} pair, it would indicate if they participate as a "connection point" (

if they form an 'edge port')

 For a given {switch, port} pair, this service can indicate if ingress broadcast is allowed

through 'port'