Reference Guide

High Availability (HA)

High availability (HA) is supported on the S4820T platform.

HA is a collection of features that preserves system continuity by maximizing uptime and minimizing packet loss during

system disruptions.

To support all the features within the HA collection, you should have the latest boot code. The following table lists the

boot code requirements as of this FTOS release.

Table 27. Boot Code Requirements

Component Boot Code

S4820T RPM 2 .8.2.0

S4820T Line Card 2 .8.2.0

The features in this collection are:

• Component Redundancy

• Online Insertion and Removal

• Hitless Behavior

• Graceful Restart

• Software Resiliency

• Warm Upgrade

• Hot-Lock Behavior

Component Redundancy

Dell Networking systems eliminate single points of failure by providing dedicated or load-balanced redundancy for each

component.

RPM Redundancy

The current version of FTOS supports 1+1 hitless route processor module (RPM) redundancy.

The primary RPM performs all routing, switching, and control operations while the standby RPM monitors the primary

RPM. In the event that the primary RPM fails, the standby RPM can assume control of the system without requiring a

chassis reboot.

This section contains the following sub-sections:

• Boot the Chassis with a Single RPM

• Boot the Chassis with Dual RPMs

• Automatic and Manual RPM Failover

• Support for RPM Redundancy by FTOS Version

• RPM Synchronization

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