Link Bundle Monitoring - Dell Force10 S4810P Configuration Manual

High-density, 1ru 48-port 10gbe switch

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Table of Contents

In the illustration below, Core Router 1 is an E-Series TeraScale and Core Router 2 is an E-Series

ExaScale. They have similar configurations and have routes for prefix P with two possible next-hops.

When Deterministic ECMP is enabled and the hash algorithm and seed are configured the same, each flow

is consistently sent to the same next hop even though they are routed through two different chassis.

Link Bundle Monitoring

Monitoring linked ECMP bundles allows traffic distribution amounts in a link to be monitored for unfair

distribution at any given time. A default threshold of 60% is defined as an acceptable amount of traffic on

a member link. Links are monitored in 15-second intervals for three consecutive instances. Any deviation

within that time causes a syslog to be sent and an alarm event to be generated. When the deviation clears,

another syslog is sent and a clear alarm event is generated.

Message 1 Link bundle monitoring percent threshold

%STKUNIT0-M:CP %IFMGR-5-BUNDLE_UNEVEN_DISTRIBUTION: Found uneven distribution in LAG bundle 11.

The link bundle utilization is calculated as the total bandwidth of all links divided by the total

bytes-per-second of all links. Within each ECMP group, interfaces can be specified. If monitoring is

enabled for the ECMP group, the utilization calculation is performed when the utilization of the

link-bundle (not a link within a bundle) exceeds 60%.

Backbone router

Core Router 1

is supported only on platform

Core Router 2

Equal Cost Multi-Path (ECMP) | 399