Configuring Route Summarization Into Ospf Area - Motorola BSR 2000 Configuration And Management Manual

BSR 2000 Configuration and Management Guide
Example
This example configures an ABR to summarize the aggregate range 1.1.0.0/16.

Configuring Route Summarization into OSPF Area

When redistributing routes from other protocols into OSPF, each route is advertised
individually in an external LSA. However, you can configure the software to advertise
a single route for all the redistributed routes that are covered by a specified network
address and mask. Doing so helps decrease the size of the OSPF link state database
and the routing table.
Use the summary-address command in Router Configuration mode to specify an IP
address and mask that covers redistributed routes so that only one summary route is
advertised:
MOT (config-ospf)#summary-address <A.B.C.D> <A.B.C.D> tag
<0-4294967295>
where:
Example
In the following example, summary address 20.1.0.0 includes address 20.1.1.0,
20.1.2.0, 20.1.3.0, and so forth. Only the address 20.1.0.0 is advertised in an external
LSA.
11-10
0-4294967295 is the number or IP address for the area.
A.B.C.D is the IP address for an individual network within the area.
A.B.C.D is the subnet mask for the address.
ip address 2.2.10.1 255.255.255.0
ip address 2.1.11.1 255.255.255.0
router ospf
network 2.2.0.0 0.0.255.255 area 0
area 0 range 2.2.0.0 255.255.0.0
A.B.C.D is the IP summary address.
A.B.C.D is the IP summary address subnet mask.
0-4294967295 is the 32-bit tag value for filtering externally derived routing
information.
summary-address 20.1.0.0 255.255.0.0
MGBI
Release 1.0
526360-001-00 Rev. B