Cisco Systems 17053 appendix Possible Causes for Incrementing CatOS Counters

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64−byte transmit time occurs. They are only

 

detected during transmissions of packets longer

 

than 64 bytes. Its detection is exactly the same as it

 

is for a normal collision; it just happens later than it

 

does for a normal collision.

 

 

Excessive

Excessive collisions are the number of frames that

Collisions

are dropped after 16 attempts to send the packet

 

 

resulted in 16 collisions.

Carrier

Carrier sense occurs every time an Ethernet

Sense

controller wants to send data and the counter is

 

 

incremented when there is an error in the process.

Runts

These are frames smaller than 64 bytes with a bad

 

FCS value.

 

 

Giants

These are frames that are greater than 1518 bytes

 

and have a bad FCS value.

 

 

Table 3￿Possible Causes for Incrementing CatOS Counters

Counter

Description

 

Alignment

These are the result of collisions at half−duplex,

duplex mismatch, bad hardware (NIC, cable, or

Errors

port), or a connected device that generates frames

 

 

that do not end with on an octet and have a bad

 

FCS.

 

 

 

These are the result of collisions at half−duplex,

FCS

duplex mismatch, bad hardware (NIC, cable, or

 

port), or a connected device that generates frames

 

with bad FCS.

 

 

 

This is an indication of excessive input rates of

 

traffic. This is also an indication that the transmit

 

buffer is full. The counter must only increment in

Xmit−Err

situations in which the switch is unable to forward

out the port at a desired rate. Situations such as

 

 

excessive collisions and 10 Mb ports cause the

 

transmit buffer to become full. If you increase

 

speed and move the link partner to full−duplex, it

 

minimizes this occurrence.

 

 

 

This is an indication of excessive output rates of

 

traffic. This is also an indication that the receive

Rcv−Err

buffer is full. This counter must be zero unless

 

there is excessive traffic through the switch. In

 

some switches, the Out−Lost counter has a direct

 

correlation to the Rcv−Err.

 

 

UnderSize

This is an indication of a bad frame generated by

 

the connected device.

 

 

Single

 

Collisions

This is an indication of a half−duplex

 

 

 

configuration.

 

 

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Contents Prerequisites IntroductionDocument ID RequirementsBackground Information General Troubleshooting for 10/100/1000 Mbps NICsAutonegotiation Valid Configuration Duplex Configuration2Mismatch Correct∙ show port modDport Verifying Physical Connection and LinkVerifying Switch Port Configuration Maintaining Link Link Up/Down Situations∙ show interfaces type Understanding Data Link Errors ∙ Adjust switch jitter tolerancePerformance Notes FCS Explanation of CatOS show port Command CountersPossible Causes for Incrementing CatOS Counters Explanation of CatOS show mac Command Counters Sniffer Trace Gigabit Autonegotiation Configuration Table Additional Troubleshooting for 1000BASE−X NICsTeaming of Network Interface Cards Gigabit Autonegotiation No Link to Connected DeviceCatalyst 8510 and 8540 CSR Catalyst 6000 and 6500 SwitchesSet port enable Catalyst 5000 and 5500 SwitchesCatalyst 4000, 2948G, and 2980G Switches Day to once a month. This issue can Catalyst 2950 and 3550 Switches NIC NIC Compatibility and Operation IssuesPage LnkChk to enable. 33921641.2241835 Hardware Panel SystemDevice ManagerPage R2BE/RBE/CBE Physical Interface PHY Control Register Programmable Options Appendix B Understanding How Autonegotiation Works= loopback mode switched on Related Information Networking Professionals Connection Featured Conversations

17053 specifications

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