Summary-Address - Allied Telesis AT-AR3050S Command Reference Manual

OSPF C
OMMANDS
-
SUMMARY ADDRESS

summary-address

Overview Use this command to summarize, or possibly suppress, external routes that have
the specified address range.
Use the no variant of this command to stop summarizing, or suppressing, external
routes that have the specified address range.
Syntax summary-address <ip-addr/prefix-length> [not-advertise] [tag
<0-4294967295>]
no summary-address <ip-addr/prefix-length> [not-advertise] [tag
<0-4294967295>]
Default The default tag value for a summary address is 0.
Mode Router Configuration
Usage An address range is a pairing of an address and a mask that is almost the same as
IP network number. For example, if the specified address range is
192.168.0.0/255.255.240.0, it matches: 192.168.1.0/24, 192.168.4.0/22,
192.168.8.128/25 and so on.
Redistributing routes from other protocols into OSPF requires the router to
advertise each route individually in an external LSA. Use the summary address
command to advertise one summary route for all redistributed routes covered by
a specified network address and mask. This helps decrease the size of the OSPF link
state database.
Ensure OSPF routes exist in the summary address range for advertisement before
using this command.
Example The following example uses the summary-address command to aggregate
external LSAs that match the network 172.16.0.0/16 and assign a Tag value of 3.
awplus#
awplus(config)#
awplus(config-router)#
C613-50077-01 REV A
Parameter
<ip-addr/prefix-
length>
not-advertise
tag <0-4294967295> The tag parameter specifies the tag value that OSPF places
configure terminal
router ospf 100
Command Reference for AT-AR3050S
AlliedWare Plus™ Operating System - Version 5.4.5-2.x
Description
Specifies the base IP address of the summary address.The
range of addresses given as IPv4 starting address and a
prefix length.
Set the not-advertise option if you do not want OSPF to
advertise either the summary address or the individual
networks within the range of the summary address.
in the AS external LSAs created as a result of redistributing
the summary route. The tag overrides tags set by the
original route.
summary-address 172.16.0.0/16 tag 3
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