Introduction; Types Of Routes; Interface Routes; Static Routes - Allied Telesis SwitchBlade x908 Series Software Reference Manual

Route Selection

Introduction

This chapter describes the route selection process used by the AlliedWare Plus
Understanding the route selection process helps in analysing and troubleshooting route-related
problems.
The process of routing packets consists of selectively forwarding data packets from one
network to another. Your device must determine which network to send each packet to, and
over which interface to send the packet in order to reach the desired network. This
information is contained in your device routes. For each packet, your device chooses the best
route it has for that packet and uses that route to forward the packet. In addition, you can
define filters to restrict the way packets are sent.

Types of Routes

Your device learns routes from static information entered as part of the configuration process
and by listening to any configured routing protocols. The following types of routes are available
on your device:

Interface Routes

Your device creates an interface route when you create the interface. This route tells your
device to send packets over that interface when the packets are addressed to the interface's
subnet.

Static Routes

You can manually enter routes, which are then called static routes. You can use static routes to:
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To create a static route, use the command:

Dynamic Routes

Your device learns dynamic routes from one or more routing protocols such as RIP, BGP, or
OSPF. The routing protocol updates these routes as the network topology changes.
n all but the most simple networks, we recommend that you configure at least one dynamic
I
routing protocol. Routing protocols enables your device to learn routes from other routers and
switches on the network, and to respond automatically to changes in network topology.
29.2
specify the default route (to 0.0.0.0). If your device does not have a route to the packet's
destination, it sends it out the default route. The default route normally points to an
external network such as the Internet.
set up multiple networks or subnets. In this case you define multiple routes for a particular
interface, usually a LAN port. This is a method of supporting multiple subnets on a single
physical media.
awplus(config)#
Software Reference for SwitchBlade® x908, x900 and x600 Series Switches
TM
AlliedWare Plus Operating System - Software Version 5.3.1
ip route <subnet&mask> {<gateway-ip>|<ifname>} [<1-255>]
TM
OS.
C613-50007-01 REV B