Cisco 10720 Configuration Guide - Page 121

Duplex Mode Setting, Speed Mode, Output Hang, CRC Field Counters, Late Collision

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Chapter 4 Troubleshooting Basic Troubleshooting Ethernet for the Access Card Duplex Mode Setting The local interface duplex mode configuration should match the remote interface configuration. See the "Verifying Interface Configuration" section on page 4-19 for an example output that shows duplex settings. Confirm that duplex settings are the same on both ends of the connection. Speed Mode The local interface speed mode field should match the remote interface configuration. See the "Verifying Interface Configuration" section on page 4-19 for an example output that shows speed settings. Speed setting display is shown in the following line: 10/100/auto Output Hang The output hang provides the number of hours, minutes, and seconds since the last reset caused by a lengthy transmission. For example, the output hang data is located on line 9 of the show interfaces GigabitEthernet 2/1 router output: Last input never, output 00:00:04, output hang never See the "Verifying Interface Configuration" section on page 4-19 for a complete example output that shows output hang data. CRC Field Counters Excessive noise will cause high CRC errors accompanied by a low number of collisions. Perform the following checks if you encounter high CRC errors: • Check the cables for damage. • Verify that the correct cables are being used for the appropriate access card. For cabling specifications, refer to the Cisco 10720 Internet Router Access Card Installation and Configuration publication. Late Collision The console will display the following message when late collisions are detected: Port 2/X - Late collision detected. Possible duplex mismatch. Late collisions result from either of the following conditions: • Ethernet cables are too long. • Duplex mode does not match the remote interface. For example, the late collisions data is located on line 22 of the show interfaces FastEthernet 2/1 router output: 0 babbles, 0 late collision, 0 deferred 78-13062-10 Cisco 10720 Internet Router Installation and Configuration Guide 4-21

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4-21
Cisco 10720 Internet Router Installation and Configuration Guide
78-13062-10
Chapter 4
Troubleshooting
Basic Troubleshooting Ethernet for the Access Card
Duplex Mode Setting
The local interface duplex mode configuration should match the remote interface configuration. See the
“Verifying Interface Configuration” section on page 4-19
for an example output that shows duplex
settings. Confirm that duplex settings are the same on both ends of the connection.
Speed Mode
The local interface speed mode field should match the remote interface configuration. See the
“Verifying
Interface Configuration” section on page 4-19
for an example output that shows speed settings. Speed
setting display is shown in the following line:
10/100/auto
Output Hang
The output hang provides the number of hours, minutes, and seconds since the last reset caused by a
lengthy transmission. For example, the output hang data is located on line 9 of the
show interfaces
GigabitEthernet 2/1
router output:
Last input never, output 00:00:04, output hang never
See the
“Verifying Interface Configuration” section on page 4-19
for a complete example output that
shows output hang data.
CRC Field Counters
Excessive noise will cause high CRC errors accompanied by a low number of collisions. Perform the
following checks if you encounter high CRC errors:
•
Check the cables for damage.
•
Verify that the correct cables are being used for the appropriate access card. For cabling
specifications, refer to the
Cisco 10720 Internet Router Access Card Installation and Configuration
publication.
Late Collision
The console will display the following message when late collisions are detected:
Port 2/X - Late collision detected. Possible duplex mismatch.
Late collisions result from either of the following conditions:
•
Ethernet cables are too long.
•
Duplex mode does not match the remote interface.
For example, the late collisions data is located on line 22 of the
show interfaces FastEthernet 2/1
router
output:
0 babbles, 0 late collision, 0 deferred