Area Range - Allied Telesis SwitchBlade x908 Series Software Reference Manual

OSPF Commands

area range

This command summarizes OSPF routes at an area boundary. By default, this feature is
disabled.
The area range command is used to summarize intra-area routes for an area. The set of
summary routes created by this command are then advertised to other areas by the Area
Border Routers (ABRs). In this way, routing information is condensed at area boundaries so
that routes are exchanged between areas in an efficient manner.
If the network numbers in an area are assigned in a way such that they fall into sets of
contiguous routes, the ABRs can be configured to advertise a small set of summary routes that
cover the individual networks within the area.
The no form disables this function.
Syntax area <area-id> range <ip-address/m> [advertise|not-advertise]
no area <area-id> range <ip-address/m>
Parameter
<area-id>
<ip-address/m>
advertise
not-advertise
Router mode
Mode
Multiple ranges can be configured on a single area by multiple instances of this command.
Usage
Examples
awplus(config-router)#
awplus(config-router)#
36.8
Description
The OSPF area that you summarising the routes for. Use one of the
following formats: This can be entered in either dotted decimal format or
normal decimal format.
<ip-address>
<0-4294967295>
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. Specify this as an IPv4 address in dotted
decimal notation followed by a forward slash, then the prefix length - in
the form
A.B.C.D/M
Advertise this range as a summary route into other areas.
Does not advertise this range.
awplus# configure terminal
awplus(config)# router ospf 100
area 1 range 192.16.0.0/16
area 1 range 203.18.0.0/16
Software Reference for SwitchBlade® x908, x900 and x600 Series Switches
TM
AlliedWare Plus Operating System - Software Version 5.3.1
OSPF Area ID expressed in IPv4 address format
.
A.B.C.D
OSPF Area ID expressed as a decimal number
within the range shown
.
C613-50007-01 REV B