Jun 13 2011 5:12AM GMT

The layer 3 link between Nexus 7010 and Cisco 6506 E Switches is frequently going down.

Yasir Irfan Profile: Yasir Irfan

We have Cisco Nexus 7010 working as a Core and Aggregation Switch. We have created two VDC one for Core and other one for Aggregation. One of Cisco 6506 E Switches connected as a distribution switch from Nexus 7010 Core Switch. Things were normal since its installation, suddenly one night we figured the layer 3 links between Nexus 7010 and Cisco Catalyst 6506 E Switch went down.

Upon looking at the log in Nexus 7010 Core Switch we found the following entries.

2011 Jun 12 09:05:03 VDC-Admin-CO01-MB-1256-001 %ETHPORT-5-IF_UP: Interface Ethernet1/17 is up in Layer3

2011 Jun 12 09:05:04 VDC-Admin-CO01-MB-1256-001 %ETHPORT-5-IF_DOWN_LINK_FAILURE: Interface Ethernet1/17 is down (Link failure)

2011 Jun 12 09:05:49 VDC-Admin-CO01-MB-1256-001 %ETHPORT-5-SPEED: Interface Ethernet1/17, operational speed changed to 10 Gbps

2011 Jun 12 09:05:49 VDC-Admin-CO01-MB-1256-001 %ETHPORT-5-IF_DUPLEX: Interface Ethernet1/17, operational duplex mode changed to Full

2011 Jun 12 09:05:49 VDC-Admin-CO01-MB-1256-001 %ETHPORT-5-IF_RX_FLOW_CONTROL: Interface Ethernet1/17, operational Receive Flow Contol state changed to off

2011 Jun 12 09:05:49 VDC-Admin-CO01-MB-1256-001 %ETHPORT-5-IF_TX_FLOW_CONTROL: Interface Ethernet1/17, operational Transmit Flow Contol state changed to off

2011 Jun 12 09:05:49 VDC-Admin-CO01-MB-1256-001 %ETHPORT-5-IF_UP: Interface Ethernet1/17 is up in Layer3

2011 Jun 12 09:05:49 VDC-Admin-CO01-MB-1256-001 %ETHPORT-5-IF_DOWN_LINK_FAILURE: Interface Ethernet1/17 is down (Link failure)

2011 Jun 12 09:07:37 VDC-Admin-CO01-MB-1256-001 %ETHPORT-5-SPEED: Interface Ethernet1/17, operational speed changed to 10 Gbps

2011 Jun 12 09:07:37 VDC-Admin-CO01-MB-1256-001 %ETHPORT-5-IF_DUPLEX: Interface Ethernet1/17, operational duplex mode changed to Full

2011 Jun 12 09:07:37 VDC-Admin-CO01-MB-1256-001 %ETHPORT-5-IF_RX_FLOW_CONTROL: Interface Ethernet1/17, operational Receive Flow Contol state changed to off

2011 Jun 12 09:07:37 VDC-Admin-CO01-MB-1256-001 %ETHPORT-5-IF_TX_FLOW_CONTROL: Interface Ethernet1/17, operational Transmit Flow Contol state changed to off

2011 Jun 12 09:07:37 VDC-Admin-CO01-MB-1256-001 %ETHPORT-5-IF_UP: Interface Ethernet1/17 is up in Layer3

2011 Jun 12 09:07:38 VDC-Admin-CO01-MB-1256-001 %ETHPORT-5-IF_DOWN_LINK_FAILURE: Interface Ethernet1/17 is down (Link failure)

2011 Jun 12 09:16:40 VDC-Admin-CO01-MB-1256-001 %ETHPORT-5-IF_HARDWARE: Interface Ethernet1/17, hardware type changed to No-Transceiver

2011 Jun 12 09:16:54 VDC-Admin-CO01-MB-1256-001 %ETHPORT-5-IF_HARDWARE: Interface Ethernet1/17, hardware type changed to 10G

2011 Jun 12 09:17:00 VDC-Admin-CO01-MB-1256-001 %ETHPORT-5-SPEED: Interface Ethernet1/17, operational speed changed to 10 Gbps

2011 Jun 12 09:17:00 VDC-Admin-CO01-MB-1256-001 %ETHPORT-5-IF_DUPLEX: Interface Ethernet1/17, operational duplex mode changed to Full

2011 Jun 12 09:17:00 VDC-Admin-CO01-MB-1256-001 %ETHPORT-5-IF_RX_FLOW_CONTROL: Interface Ethernet1/17, operational Receive Flow Contol state changed to off

2011 Jun 12 09:17:00 VDC-Admin-CO01-MB-1256-001 %ETHPORT-5-IF_TX_FLOW_CONTROL: Interface Ethernet1/17, operational Transmit Flow Contol state changed to off.

We tried to reset the Ethernet Interface in the Nexus 7010 Switch by using Cisco IOS command “shutdown” and “no shutdown” but it’s of no use. The only way to solve this problem is to manually remove and reconnect the fiber patch cord connected to the Ethernet port in the Nexus 7010 Switch. Currently we are looking for the solution, the moment we find I will update you. Meanwhile if any solutions available make use of comments to help me.