CRC Error

Error:

CRC Error is keep on increasing in adapter ent1

now CRC error is increased to 187236

server1 /--]entstat en1

-------------------------------------------------------------

ETHERNET STATISTICS (en1) :

Device Type: 2-Port 10/100/1000 Base-TX PCI-X Adapter (14108902)

Hardware Address: 00:05

Elapsed Time: 1 days 21 hours 57 minutes 16 seconds

Transmit Statistics: Receive Statistics:

-------------------- -------------------

Packets: 2500776 Packets: 3283110

Bytes: 1616528493 Bytes: 1298373951

Interrupts: 0 Interrupts: 3129380

Transmit Errors: 0 Receive Errors: 288264

Packets Dropped: 0 Packets Dropped: 0

Bad Packets: 0

Max Packets on S/W Transmit Queue: 34

S/W Transmit Queue Overflow: 0

Current S/W+H/W Transmit Queue Length: 1

Broadcast Packets: 7 Broadcast Packets: 1020839

Multicast Packets: 1 Multicast Packets: 16541

No Carrier Sense: 0 CRC Errors: 187236

DMA Underrun: 0 DMA Overrun: 0

Lost CTS Errors: 0 Alignment Errors: 94636

Max Collision Errors: 0 No Resource Errors: 0

Solution:

The cause of CRC error due to Bad hardware or Media speed of ent1 Adapter.

server1 /--]entstat -d ent1 grep Media

Media Speed Selected: 100 Mbps Full Duplex

Media Speed Running: 100 Mbps Full Duplex

Now, we need to check the switch speed for this interface. In our case, switch speed is not matching with interface. So, we changed the switch speed. Once it changed, CRC error stopped immediately.