Reference Guide

20
High Availability (HA)
High availability (HA) in the Dell Networking operating software (FTOS) is configuration synchronization to minimize
recovery time in the event of a route processor module (RPM) failure. The feature is available on the S4820T platform.
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.
You must specifically enable some protocols for HA. Some protocols are only hitless if related protocols are also
enabled as hitless (for example, the redundancy protocol command).
patch flash://RUNTIME_PATCH_DIR
Insert an In-Service Modular Hot-Fix patch.
S4820T
Syntax
patch flash://RUNTIME_PATCH_DIR/patch-filename
To remove the patch, use the no patch flash://RUNTIME_PATCH_DIR/patch-
filename
command.
Defaults none
Command Modes CONFIGURATION
Command History
This guide is platform-specific. For command information about other platforms, refer to the
relevant FTOS Command Line Reference Guide .
The following is a list of the FTOS version history for this command.
Version 8.3.19.0 Introduced on the S4820T.
Version 8.3.12.0 Introduced on the S4810.
Version 8.2.1.0 Introduced.
Usage
Information
The patch filename includes the FTOS version, the platform, the CPU, and the process it affects
(FTOS-platform-cpu-process-patchversion.rtp). For example, a patch labeled
“7.8.1.0-EH-rp2-l2mgr-1.rtp” identifies that this patch applies to FTOS version 7.8.1.0 — E-Series
platform, for RP2, addressing the layer 2 management process, and this patch is the first
version of this patch.
There is no need to reload or reboot the system when you insert the patch. The In-Service
Modular patch replaces the existing process code. After installation is complete, the system
executes the patch code as though it was always there.
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