Area Range - Allied Telesis AT-AR3050S Command Reference Manual

OSPF C
OMMANDS

AREA RANGE

area range
Overview Use this command to summarize OSPF routes at an area boundary, configuring an
IPv4 address range which consolidates OSPF routes. By default, this feature is not
enabled.
A summary route created by this command is then advertised to other areas by the
Area Border Routers (ABRs). In this way, routing information is condensed at area
boundaries and outside the area so that routes are exchanged between areas in an
efficient manner.
If the network numbers in an area are arranged into sets of contiguous routes, the
ABRs can be configured to advertise a summary route that covers all the individual
networks within the area that fall into the specified range.
The no variant of this command disables this function and restores default
behavior.
area <area-id> range <ip-addr/prefix-length>
Syntax
[advertise|not-advertise]
no area <area-id> range <ip-addr/prefix-length>
Default The area range is not configured by default. The area range is advertised if it is
configured.
Mode Router Configuration
Usage You can configure multiple ranges on a single area with multiple instances of this
command, so OSPF summarizes addresses for different sets of IPv4 address ranges.
C613-50077-01 REV A
Parameter
<area-id>
<ip-addr/prefix-
length>
advertise
not-advertise
Command Reference for AT-AR3050S
AlliedWare Plus™ Operating System - Version 5.4.5-2.x
Description
The OSPF area that you summarizing the routes for.
Use one of the following formats: This can be entered
in either dotted decimal format or normal decimal
format.
<ip-addr>
OSPF Area ID expressed in
IPv4 address format A.B.C.D.
<0-4294967295>
OSPF Area ID expressed as a
decimal number within the
range shown.
For example the values dotted decimal 0.0.1.2 and
decimal 258 would both define the same area ID.
The area range prefix and length.
Advertise this range as a summary route into other
areas.
Does not advertise this range.
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