Cisco WS-C2960S-24PD-L Software Guide - Page 276
Problem, Suspected Cause and Suggested Solution, Select a low-latency LL LRE profile, such as LRE-5LL
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Troubleshooting LRE Port Configuration Chapter 9 Troubleshooting Table 9-6 LRE Port Problems (continued) Problem Ethernet performance degradation due to excessive network latency Suspected Cause and Suggested Solution Interleaver introduces extra latency to increase noise margin. • Adjust upper-layer network protocols to allow for high latency. • Change to a profile with a higher data rate to increase link bandwidth. This decreases the noise margin. • Select a low-latency (LL) LRE profile, such as LRE-5LL, LRE-10LL, or LRE-15LL. Note Use the low-latency (LL) private profiles with care. The LL profiles have the LL feature enabled and the interleaver feature turned off. The LL feature does not delay data transmission, but it makes data more susceptible to interruptions on the LRE link. All other profiles, public and private, have the interleaver feature enabled and the LL feature disabled. The interleaver feature provides maximum protection against small interruptions on the LRE link but delays data transmission. For more information about the LRE profiles, see the "Types of LRE Profiles" section on page 7-17. LRE link quality Cross-talk between the LRE links is causing all links to degrade. Disable unused LRE ports by using reduced in installations the lre shutdown interface configuration command. with bundled cables 9-10 Catalyst 2900 Series XL and Catalyst 3500 Series XL Software Configuration Guide 78-6511-08