Brocade 6910 Ethernet Access Switch Diagnostic Guide (Supporting R2.2.0.0) - Manual (Page 30)

20 Brocade 6910 Ethernet Access Switch Diagnostic Guide
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DRAFT: BROCADE CONFIDENTIAL
Ethernet diagnostics
receiver error counter (21_0) = 0x 0
late collision @65-96 (23_6.0:7) = 0x 0
late collision @97-128 (23_6.8:15) = 0x 0
late collision @129-192 (24_6.0:7) = 0x 0
late collision @> 192 (24_6.8:15) = 0x 0
link disconnect (25_6.0:7)(ROC) = 0x 2
=========Dev 0 Port 2(Linkup=0) ============
crc error counter (17_6.0:7) = 0x 0
crc pkt counter (17_6.8:15) = 0x 0
receiver error counter (21_0) = 0x 0
late collision @65-96 (23_6.0:7) = 0x 0
late collision @97-128 (23_6.8:15) = 0x 0
late collision @129-192 (24_6.0:7) = 0x 0
late collision @> 192 (24_6.8:15) = 0x 0
link disconnect (25_6.0:7)(ROC) = 0x 0
This command shows the mapping between physical ports and MAC ports.
Console#debug hardware dev-swdrv port-map
unit=1 port= 1 => device_id= 0 module= 0 phy_port= 1 phy_id= 1
unit=1 port= 2 => device_id= 0 module= 0 phy_port= 0 phy_id= 0
unit=1 port= 3 => device_id= 0 module= 0 phy_port= 3 phy_id= 3
unit=1 port= 4 => device_id= 0 module= 0 phy_port= 2 phy_id= 2
unit=1 port= 5 => device_id= 0 module= 0 phy_port= 5 phy_id= 5
unit=1 port= 6 => device_id= 0 module= 0 phy_port= 4 phy_id= 4
unit=1 port= 7 => device_id= 0 module= 0 phy_port= 7 phy_id= 7
unit=1 port= 8 => device_id= 0 module= 0 phy_port= 6 phy_id= 6
unit=1 port= 9 => device_id= 0 module= 0 phy_port= 9 phy_id= 9
unit=1 port=10 => device_id= 0 module= 0 phy_port= 8 phy_id= 8
unit=1 port=11 => device_id= 0 module= 0 phy_port= 11 phy_id= 11
unit=1 port=12 => device_id= 0 module= 0 phy_port= 10 phy_id= 10
Common diagnostic scenarios
The following issues can occur with Ethernet interfaces:
• Faulty hardware
Whenever you encounter a connection problem, check for faulty hardware. Replace cables, try
another port, and check all cable connections. If you find a faulty port, contact Brocade
Technical Support for assistance.
• Link failures
Link failures can be due to a failure of the transmission medium or of the devices at each end
of a connection. Be sure to check all of the hardware involved in the link, including cables and
ports.
• CSMA/CD
The Carrier Sense Multiple Access (CSMA) with Collision Detection (CD) protocol controls
access to shared Ethernet media. A switched network (for example, Fast Ethernet) may use a
full-duplex mode with access to the full link speed between directly connected network
interface cards (NICs), switch-to-NIC cables, or switch-to-switch cables.
• CRC errors
The Cyclic Redundancy Check (CRC) length specifies whether the CRC portion of each frame
transmitted on the interface is 16 bits or 32 bits long. The default is 32 bits.