Network technologies and trends

Jul 6 2011   10:07AM GMT

The layer 3 link between Nexus 7010 and Cisco 6506 E Switches is frequently going down part 2



Posted by: Yasir Irfan
Tags:
62.5/125 microns
Cisco Catalyst 6506 E Switches
Cisco Nexus 7010 Series Switch
Cisco Switches
Cisco Tips
Cisco X2-10GB-LX4
Cisco X2-10GB-SR Module
Fiber optic cable
fiber patch cord
multimode fiber optic cable
Network Technologies and Trends
Nexus 7000 troubleshooting
Nexus 7010
operational Receive Flow Contol state changed to off
operational speed changed to 10 Gbps 2011 Jun 12 09:05:49 VDC-Admin-CO01-
operational Transmit Flow Contol state changed to off
physical media
VDC-Admin-CO01-MB-1256-001 %ETHPORT-5-IF_DOWN_LINK_FAILURE: Interface Ethernet1/17 is down (Link failure)
VDC-Admin-CO01-MB-1256-001 %ETHPORT-5-IF_RX_FLOW_CONTROL: Interface Ethernet1/17
VDC-Admin-CO01-MB-1256-001 %ETHPORT-5-IF_TX_FLOW_CONTROL: Interface Ethernet1/17
VDC-Admin-CO01-MB-1256-001 %ETHPORT-5-IF_UP: Interface Ethernet1/17 is up in Layer3
VDC-Admin-CO01-MB-1256-001 %ETHPORT-5-SPEED: Interface Ethernet1/17
wavelength

In my previous post I was talking about the problem we were facing with connectivity between Cisco 6500 Series switch and Cisco Nexus 7010 Switch. While troubleshooting we figured out there were no issues either with configuration of physical media (Fiber optic cable), the problem turned out to with 10GBASE X2 modules. Though the distance between these two locations is hardly 250 meters and there was a multimode fiber optic cable (supports 10G) running between these two locations. Initially a Cisco X2-10 GB-LX4 module was installed at Cisco 6500 Series Switch and at the Nexus 7010 we had a SFP SR Module.

Table 1. X2 Port Cabling Specifications

Cisco X2 Wavelength (nm) Cable Type Core Size (microns) Modal Bandwidth (MHz*km) Cable Distance*
Cisco X2-10GB-CX4 - CX4 (copper) - - 15m
Cisco X2-10GB-SR 850 MMF 62.5

62.5

50.0

50.0

50.0

160

200

400

500

2000

26m

33m

66m

82m

300m

Cisco X2-10GB-LRM 1310 MMF 62.5

50.0

50.0

500

400

500

220m

100m

220m

SMF G.652 - 300m
Cisco X2-10GB-LX4 1310 MMF 62.5

50.0

50.0

500

400

500

300m

240m

300m

Cisco X2-10GB-LR 1310 SMF G.652 - 10 km
Cisco X2-10GB-ER** 1550 SMF G.652 - 40 km***

Intially everything looked good but after three months the problems aroused and the link start disconnecting, with the following errors

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

We figured out the multimode fiber optic cable used is of 62.5/125 microns. As per the Cisco X2 port cabling specifications we were supposed to use either Cisco X2-10GB-SR or Cisco X2-10GB-LX4 module at Cisco 6500 Series Switch and a SFP SR Module at Nexus 7010 Switch.

Seems like the problem occurred with the wavelength of fiber, once we replaced the Cisco X2-10GB-LX4 module with the Cisco X2-10GB-SR Module the problem was solved.

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