1. Detach a node using restconf (https://wiki.opendaylight.org/view/OpenDaylight_Controller:Config:Examples:Netconf#Reconfiguring_Netconf_Connector_While_the_Controller_is_Running)
2. REattach the node
3. Send config to / read operational data from node , using MountInstance API

You'll see the following error in opendaylight log and the operation fails.

2015-04-28 07:31:00.910 IST [pool-30-thread-1] ERROR o.o.c.m.s.c.i.s.TwoPhaseCommit - Transaction: BA-3 Request Commit failed
java.lang.RuntimeException: RemoteDevice

{dna-node}: Error while replacing /(urn:cisco:params:xml:ns:yang:dna:ldna?revision=2014-07-05)local-dna/telemetry-sources/telemetry/telemetry[{(urn:cisco:params:xml:ns:yang:dna:ldna?revision=2014-07-05)id=2}]
at org.opendaylight.controller.sal.connect.netconf.sal.tx.NetconfDeviceWriteOnlyTx.put(NetconfDeviceWriteOnlyTx.java:125) ~[na:na]
at org.opendaylight.controller.sal.connect.netconf.sal.tx.NetconfDeviceReadWriteTx.put(NetconfDeviceReadWriteTx.java:46) ~[na:na]
at org.opendaylight.controller.md.sal.dom.broker.impl.compat.BackwardsCompatibleTransaction$ReadWriteTransaction.putWithEnsuredParents(BackwardsCompatibleTransaction.java:253) ~[na:na]
at org.opendaylight.controller.md.sal.dom.broker.impl.compat.BackwardsCompatibleTransaction$ReadWriteTransaction.putConfigurationData(BackwardsCompatibleTransaction.java:216) ~[na:na]
at org.opendaylight.controller.md.sal.dom.broker.impl.compat.BackwardsCompatibleTransaction$ReadWriteTransaction.putConfigurationData(BackwardsCompatibleTransaction.java:191) ~[na:na]
at org.opendaylight.controller.sal.binding.impl.connect.dom.BindingToDomCommitHandler.createBindingToDomTransaction(BindingToDomCommitHandler.java:92) ~[na:na]
at org.opendaylight.controller.sal.binding.impl.connect.dom.BindingToDomCommitHandler.requestCommit(BindingToDomCommitHandler.java:57) ~[na:na]
at org.opendaylight.controller.md.sal.common.impl.service.TwoPhaseCommit.call(TwoPhaseCommit.java:87) [bundlefile:na]
at org.opendaylight.controller.md.sal.common.impl.service.TwoPhaseCommit.call(TwoPhaseCommit.java:36) [bundlefile:na]
at java.util.concurrent.FutureTask.run(FutureTask.java:262) [na:1.7.0_67]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) [na:1.7.0_67]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) [na:1.7.0_67]
at java.lang.Thread.run(Thread.java:745) [na:1.7.0_67]
Caused by: java.util.concurrent.ExecutionException: RemoteDevice{dna-node}

: Pre-commit rpc failed, request: Node[ImmutableCompositeNode], qName[edit-config], modify[n/a], children.size = 4, errors: [RpcError [message=The netconf session to dna-node is disconnected, severity=ERROR, errorType=TRANSPORT, tag=operation-failed, applicationTag=null, info=null, cause=null]]