// get the list of hosts on which VPC spans (i.e hosts that need to be aware of VPC topology change update)
List<Long> vpcSpannedHostIds = _ovsNetworkToplogyGuru.getVpcSpannedHosts(vpcId);
String bridgeName=generateBridgeNameForVpc(vpcId);
OvsVpcPhysicalTopologyConfigCommand topologyConfigCommand = prepareVpcTopologyUpdate(vpcId);
topologyConfigCommand.setSequenceNumber(getNextTopologyUpdateSequenceNumber(vpcId));
// send topology change update to VPC spanned hosts
for (Long id: vpcSpannedHostIds) {
if (!sendVpcTopologyChangeUpdate(topologyConfigCommand, id, bridgeName)) {
s_logger.debug("Failed to send VPC topology change update to host : " + id + ". Moving on " +