Reference Guide

High Availability (HA) | 565

High Availability (HA)

Overview

High Availability (HA) in FTOS is configuration synchronization to minimize

recovery time in the event of a Route Processor Module (RPM) failure. The feature is

available on the C-Series and E-Series where noted by these symbols under

command headings: c e s and

FTOS on the E-Series supports RPM 1 + 1 redundancy. The Primary RPM performs

all routing and control operations, while the Secondary RPM is online and

monitoring the Primary RPM.

In general, a protocol is defined as “hitless” in the context of an RPM failure/failover,

and not failures of a line card, SFM, or power module. A protocol is defined as hitless

if an RPM failover has no impact on the protocol.

Some protocols must be specifically enabled for HA, and some protocols are only

hitless if related protocols are also enabled as hitless (Refer to the

redundancy protocol

command).

High Availability is supported on the S-Series S4810 with FTOS 8.3.12.0

and E-Series ExaScale

with FTOS 8.1.1.0 and later. High Availability is

supported on the S4820T with FTOS 8.3.19.0 and later.

Commands

The HA commands available in FTOS are:

• patch flash://RUNTIME_PATCH_DIR

• process restartable

• redundancy auto-failover-limit

• redundancy disable-auto-reboot

• redundancy force-failover

• redundancy primary

• redundancy protocol

• redundancy reset-counter