Configuring Ospf Interfaces - Juniper IGP - CONFIGURATION GUIDE V11.1.X Configuration Manual

summary-address
summary-prefix

Configuring OSPF Interfaces

You can configure OSPF attributes for either a single OSPF network by using the
address commands, or for all OSPF networks on a particular media interface by
using the ip ospf commands.
The size of the OSPF maximum transmission unit (MTU) is negotiated rather than
configured. OSPF database description exchange uses the interface MTU to signal
the largest OSPF MTU that can be sent over an OSPF interface without fragmentation.
host1(config-router)#network 2.2.0.0 0.0.255.255 area 0
At this point, the OSPF process is configured with two OSPF interfaces. If your
router is an ABR, two networks must be summarized: 2.2.10.0/24 and
2.2.11.0/24.
host1(config-router)#area 0 range 2.2.0.0 255.255.0.0
After you enter this area range command, only the aggregated range 2.2.0.0/16
is going to be summarized.
Use the no version to disable the aggregation of routes at the OSPF area border.
See area range
Use to aggregate external routes at the border of the OSPF routing domain.
Use the summary-address command for IP routes. Use the summary-prefix
command for IPv6 routes.
Use only for AS boundary routers.
The AS boundary router advertises one external route as an aggregate for all
redistributed routes that are covered by the address.
For OSPF, these commands summarize only routes from other routing protocols
that are being redistributed into OSPF.
With these commands, you can reduce the load of advertising many OSPF
external routes by specifying a range that includes some (or all) of these external
routes.
Example
host1(config-router)#summary-address 10.1.0.0 255.255.0.0
Use the area range command for route summarization between OSPF areas.
Use the no version to restore the default.
See summary-address
See summary-prefix
Chapter 5: Configuring OSPF
Configuring OSPF Interfaces
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