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OPERATIONAL DEFECT DATABASE
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N9k // N9K-X9736C-FX // DWDM Interface Flap when DWDM link protection is triggered
On N9K // module N9K-X9736C-FX
N/A
N9k [N9K-X9736C-FX] [10Gbase-SR] [Eth9/5] —————— [Eth1/9] N3K 1. On Nexus 3K Eth1/9 >>> ?shut ; no shut? at 11:30:48 2. Interface comes up after two seconds 3. However after ?debounce time? 10 seconds from ?shut,no-shut? N9K interface goes down at 11:30:58 4. Took another ?debounce time? 10 seconds top be up again > To me this is not an expected behaviour, as N9K should stay up all the time ?link recovered within debounce time? ======== N3K: ======== switch# show logg log 2019 Oct 14 11:30:26 switch last message repeated 1 time 2019 Oct 14 11:30:26 switch %SYSLOG-1-SYSTEM_MSG: Logging logfile (messages) cleared by user 2019 Oct 14 11:30:48 switch %ETHPORT-5-IF_DOWN_CFG_CHANGE: Interface Ethernet1/9 is down(Config change) 2019 Oct 14 11:30:48 switch %ETHPORT-5-IF_DOWN_ADMIN_DOWN: Interface Ethernet1/9 is down (Administratively down) 2019 Oct 14 11:30:48 switch last message repeated 1 time 2019 Oct 14 11:30:48 switch %ETHPORT-5-IF_ADMIN_UP: Interface Ethernet1/9 is admin up . 2019 Oct 14 11:30:50 switch %ETHPORT-5-SPEED: Interface Ethernet1/9, operational speed changed to 10 Gbps 2019 Oct 14 11:30:50 switch %ETHPORT-5-IF_DUPLEX: Interface Ethernet1/9, operational duplex mode changed to Full 2019 Oct 14 11:30:50 switch %ETHPORT-5-IF_RX_FLOW_CONTROL: Interface Ethernet1/9, operational Receive Flow Control state changed to off 2019 Oct 14 11:30:50 switch %ETHPORT-5-IF_TX_FLOW_CONTROL: Interface Ethernet1/9, operational Transmit Flow Control state changed to off 2019 Oct 14 11:30:50 switch %ETHPORT-5-IF_UP: Interface Ethernet1/9 is up in Layer3 2019 Oct 14 11:30:58 switch %ETHPORT-5-IF_DOWN_LINK_FAILURE: Interface Ethernet1/9 is down (Link failure) 2019 Oct 14 11:31:09 switch %ETHPORT-5-SPEED: Interface Ethernet1/9, operational speed changed to 10 Gbps 2019 Oct 14 11:31:09 switch %ETHPORT-5-IF_DUPLEX: Interface Ethernet1/9, operational duplex mode changed to Full 2019 Oct 14 11:31:09 switch %ETHPORT-5-IF_RX_FLOW_CONTROL: Interface Ethernet1/9, operational Receive Flow Control state changed to off 2019 Oct 14 11:31:09 switch %ETHPORT-5-IF_TX_FLOW_CONTROL: Interface Ethernet1/9, operational Transmit Flow Control state changed to off 2019 Oct 14 11:31:09 switch %ETHPORT-5-IF_UP: Interface Ethernet1/9 is up in Layer3 switch# attach module 1 module-1# show system internal port-client link-event *************** Port Client Link Events Log *************** ---- ------ ----- ----- ------ Time PortNo Speed Event Stsinfo ---- ------ ----- ----- ------ Oct 14 11:31:09 2019 00957398 Ethernet1/9 10G UP SUCCESS(0x0) Oct 14 11:30:58 2019 00863692 Ethernet1/9 ---- DOWN Link down debounce timer stopped and link is down Oct 14 11:30:58 2019 00760741 Ethernet1/9 ---- DOWN Link down debounce timer started(0x40e50006) ======== N9K: ======== SMURFETTE# show logg log 2019 Oct 14 11:30:33 SMURFETTE last message repeated 1 time 2019 Oct 14 11:30:33 SMURFETTE %SYSLOG-1-SYSTEM_MSG: Logging logfile (messages) cleared by user 2019 Oct 14 11:30:58 SMURFETTE %ETHPORT-5-IF_DOWN_LINK_FAILURE: Interface Ethernet5/9 is down (Link failure) <<<<<<<<<<<<<<<<<<<<<<<<<<< 2019 Oct 14 11:31:09 SMURFETTE %ETHPORT-5-SPEED: Interface Ethernet5/9, operational speed changed to 10 Gbps 2019 Oct 14 11:31:09 SMURFETTE %ETHPORT-5-IF_DUPLEX: Interface Ethernet5/9, operational duplex mode changed to Full 2019 Oct 14 11:31:09 SMURFETTE %ETHPORT-5-IF_RX_FLOW_CONTROL: Interface Ethernet5/9, operational Receive Flow Control state changed to off 2019 Oct 14 11:31:09 SMURFETTE %ETHPORT-5-IF_TX_FLOW_CONTROL: Interface Ethernet5/9, operational Transmit Flow Control state changed to off 2019 Oct 14 11:31:10 SMURFETTE %ETHPORT-5-IF_UP: Interface Ethernet5/9 is up in Layer3 module-5# show system internal port-client link-event *************** Port Client Link Events Log *************** ---- ------ ----- ----- ------ Time PortNo Speed Event Stsinfo ---- ------ ----- ----- ------ Oct 14 11:31:09 2019 00173821 Ethernet5/9 10G UP SUCCESS(0x0) Oct 14 11:30:58 2019 00752656 Ethernet5/9 ---- DOWN Link down debounce timer stopped and link is down Oct 14 11:30:48 2019 00721476 Ethernet5/9 ---- DOWN Link down debounce timer started(0x40e50006)