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Chapter 29 - Maintaining The Router
The actual software of the RuggedRouter is composed of a number of “packages”.
Each package contains all of the files necessary to implement a set of related
commands or features, such as a firewall or ssh client. A router upgrade involves
replacing some of these packages with newer versions and with adding new packages.
The upgrade system handles all this for you.
When A Software Upgrade Requires A Reboot
Software release upgrades that involve changing to a new linux kernel require a
reboot. Releases that force a reboot are always “Major” releases (but note that some
major releases may not require a reboot). Minor releases will never require a reboot.
The upgrades release notes will state whether a reboot will occur.
You are warned before starting an upgrade when a reboot is required. The only
exception is the unattended automatic upgrade.
Automatic Upgrade
It can be programmed to check a server on your network at a specific time each day,
upgrading to the newest release. RuggedCom understands that some administrators
may wish to pre-test package upgrades on specific machines before performing a
network wide upgrade. It is also possible to manually control the upgrade process on
a per-machine per-package basis.
The upgrade system allows you to restrict the maximum amount of bandwidth
consumed by an upgrade. Most upgrades will involve relatively modest amounts of
data transfer, especially over an Ethernet class network. But when the router is
accessed over a low speed WAN link, even a small upgrade can temporarily consume
100% of the links bandwidth. This can disrupt mission critical applications. The
bandwidth limiting feature limits only the upgrading process, leaving regular traffic
unregulated.
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