Displaying The Physical Path; Diagnosing Lre Connection Problems - Cisco 2950 - Catalyst Switch Configuration Manual

Diagnosing LRE Connection Problems

Displaying the Physical Path

You can display physical path that a packet takes from a source device to a destination device by using
one of these privileged EXEC commands:
•
•
For more information, refer to the command reference for this release.
Diagnosing LRE Connection Problems
Table 32-2
the Catalyst 2950 LRE switches. For more information about LRE connections, see the
Guidelines for LRE Links" section on page
For switch upgrade and customer premises equipment (CPE) device upgrade troubleshooting
information, see the
Table 32-2 LRE Port Problems
Problem Suspected Cause and Suggested Solution
Amber LRE port LED The switch and CPE device are unable to establish an LRE link using the selected profile.
Excessive CRC errors
on an LRE link
Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide
32-18
traceroute mac [interface interface-id] {source-mac-address} [interface interface-id]
{destination-mac-address} [vlan vlan-id] [detail]
traceroute mac ip {source-ip-address | source-hostname} {destination-ip-address |
destination-hostname} [detail]
lists problems that you might encounter when configuring and monitoring the LRE ports on
"Upgrading LRE Switch Firmware" section on page
Change to a profile with a lower data rate (for example, use LRE-5 instead of LRE-15).
•
• Reduce the effect of stubs or bridge taps by terminating them with 300-ohm microfilters.
• A noisy environment (such as motors and power surges) is causing interference with the LRE
link.
– Change to a profile that has the interleave feature enabled, such as the LRE-5, LRE-10,
LRE-15, LRE-10-1, LRE-10-3, or LRE-10-5 profile.
– Change the interleave block size value to a value other than 0.
– Change to a profile with a lower data rate (for example, use LRE-5 instead of LRE-15) to
increase the noise margin.
• The LRE link length and quality are close to the limit of operation.
– Change to a lower profile (for example, LRE-5 instead of LRE-15).
Reduce the effect of stubs or bridge taps by terminating them with 300-ohm microfilters.
–
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Chapter 32 Troubleshooting
"Environmental
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