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Troubleshooting LRE Port Configuration
Table 9-6
LRE Port Problems (continued)
Problem
Suspected Cause and Suggested Solution
Ethernet performance
Interleaver introduces extra latency to increase noise margin.
degradation due to
excessive network
latency
Note
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
Catalyst 2900 Series XL and Catalyst 3500 Series XL Software Configuration Guide
9-10
•
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.
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
Chapter 9
Troubleshooting
7-17.
78-6511-08
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Table of Contents
Troubleshooting
