Users Guide

• Specify the hash algorithm seed.
CONFIGURATION mode.
hash-algorithm seed value [linecard slot-id] [port-set number]
The range is from 0 to 4095.
Link Bundle Monitoring
Link bundle monitoring allows the system to monitor the use of multiple links for an uneven distribution.
A global default threshold of 60% is the usage percentage for the bundle; when the system reaches this threshold, it begins monitoring the
congured ECMP groups for uneven distribution. Links are monitored in 15-second intervals for three consecutive instances. Any deviation
exceeding 10% among any of the bundle links sends a syslog and an alarm event is generated; for example, 01:16:25: %STKUNIT0-
M:CP %IFMGR-5-BUNDLE_UNEVEN_DISTRIBUTION: Found uneven distribution in ECMP-GROUP bundle 1.
When the deviation clears, another syslog is sent and a clear alarm event is generated; for example, 01:35:14: %STKUNIT0-M:CP
%IFMGR-5-BUNDLE_UNEVEN_DISTRIBUTION_ALARM_CLEAR: Uneven distribution in ECMP-GROUP bundle 1 got
cleared.
The link bundle utilization is calculated as the total bandwidth of all links divided by the total bytes-per-second of all links, as shown in the
following example.
Example of Viewing Link Bundle Monitoring
Dell# show link-bundle-distribution ecmp-group 1
Link-bundle trigger threshold - 60
ECMP bundle - 1 Utilization[In Percent] - 44 Alarm State - Active
Interface Line Protocol Utilization[In Percent]
Te 0/0 Up 36
Te 0/1 Up 52
Managing ECMP Group Paths
To manage ECMP group paths, you can congure the maximum number of paths for an ECMP route that the L3 CAM can hold to avoid
path degeneration. When you do not congure the maximum number of routes, the CAM can hold a maximum ECMP per route.
To congure the maximum number of paths, use the following command.
NOTE
: Save the new ECMP settings to the startup-cong (write-mem) then reload the system for the new settings to take
eect.
• Congure the maximum number of paths per ECMP group.
CONFIGURATION mode.
ip ecmp-group maximum-paths {2-64}
• Enable ECMP group path management.
CONFIGURATION mode.
ip ecmp-group path-fallback
Example of the ip ecmp-group maximum-paths Command
Dell(conf)#ip ecmp-group maximum-paths 3
User configuration has been changed. Save the configuration and reload to take effect
Dell(conf)#
366
Equal Cost Multi-Path (ECMP)