The reason for the brcdMctClusterPeerOperStatus is in ccpDown(3) state. The following values are supported as down reason: none(1) - Peer is not in down state loopbackInterfaceDown(2) - Loopback interface down iclInterfaceDown(3) - ICL interface down upgradeInProgress(4) - Graceful upgrade in progress routeNotAvailable(5) - Route to cluster Peer is not available iclVeDown(6) - ICL VE interface down rBridgeIdMismatch(7) - RBridge ID does not match with Peer clusterIdMismatch(8) - Cluster ID does not match with Peer keepAliveTimeMismatch(9) - KeepAlive Time does not match with Peer holdTimeMismatch(10) - Hold Time does not match with Peer fastFailoverMismatch(11) - Fast Failover parameter does not match with Peer shutdownMesgFromPeer(12) - ShutDown message came from Peer tcpKeepAliveTimeout(13) - TCP keepalive timeout message came tcpConnCloseMesg(14) - TCP connection close message came holdTimeoutExpired(15) - Hold timeout expired sendStateTimeoutExpired(16) - Send State timeout expired recvStateTimeoutExpired(17) - Recieve State timeout expired initMesgSendFail(18) - Unable to send the Init message keepAliveMesgSendFail(19) - Unable to send the Keepalive message invalidAppMesgRecv(20) - Invalid Application packet received message came from peer badProtocolVersionPktRecv(21) - Bad Protocol version packet received message came from peer badPduLengthPktRecv(22) - Bad PDU length packet received message came from peer unknownCcpPktRecv(23) - Unknown CCP message type packet received message came from peer invalidCcpPktRecv(24) - Invalid CCP message length packet received message came from peer internalCcpErrorRecv(25) - Internal CCP error message came from peer ccpTcpCommFail(26) - Cluster CCP TCP communication failed