Cisco 2970 Hardware Installation Guide - Page 97

Catalyst 2900 Series XL and, Configuration Guide, LRE-5LL, or - layer 3

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Chapter 3 Troubleshooting Diagnosing Problems Table 3-2 Common Problems and Their Solutions (continued) Symptom Ethernet performance degradation due to excessive network latency. Possible Cause Interleaver introduces extra latency to increase noise margin. Resolution • 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 disabled. 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, For more information, refer to the Catalyst 2900 Series XL and Catalyst 3500 Series XL Software Configuration Guide. 78-6461-04 Catalyst 2900 Series XL Hardware Installation Guide 3-9

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3-9
Catalyst 2900 Series XL Hardware Installation Guide
78-6461-04
Chapter 3
Troubleshooting
Diagnosing Problems
Ethernet performance
degradation due to
excessive network
latency.
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
disabled. 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,
For more information, refer to the
Catalyst 2900 Series XL and
Catalyst 3500 Series XL Software
Configuration Guide
.
Table 3-2
Common Problems and Their Solutions (continued)
Symptom
Possible Cause
Resolution