Cisco WS-C2960S-24PD-L Software Guide - Page 275
Troubleshooting LRE Port Configuration
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Chapter 9 Troubleshooting Troubleshooting LRE Port Configuration Troubleshooting LRE Port Configuration Table 9-6 lists problems you might encounter when configuring and monitoring the Long-Reach Ethernet (LRE) ports on the Catalyst 2900 LRE XL switches. For additional information about what can affect LRE connections, see the "Environmental Considerations for LRE Links" section on page 7-18. LRE command descriptions provide additional troubleshooting information. Refer to the switch command reference. Table 9-6 LRE Port Problems Problem Amber LRE port LED Excessive CRC errors on an LRE link High Reed-Solomon error count without CRC errors Suspected Cause and Suggested Solution The switch and CPE are unable to establish an LRE link using the selected profile. • 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 interleaver feature enabled, such as the LRE-5, LRE-10, LRE-15, LRE-10-1, LRE-10-3, or LRE-10-5 profile. - 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. • Interleaver is helping Reed-Solomon error correction to function correctly in a noisy environment. This situation means that the system is on the verge of generating CRC errors. - Change to a profile that has the interleaver feature enabled, such as the LRE-5, LRE-10, LRE-15, LRE-10-1, LRE-10-3, or LRE-10-5 profile. - 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 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. 78-6511-08 Catalyst 2900 Series XL and Catalyst 3500 Series XL Software Configuration Guide 9-9