
Customizing OSPF Services
308627-14.20 Rev 00
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Configuring a Summary Route
OSPF border routers generate summary advertisements for their attached areas.
Each summary advertisement specifies a range of destinations in an area. An area
range specification consists of a network address and a variable-length mask.
For example, a summary advertisement for the destination 140.191.0.0 with a
mask of 255.255.0.0 describes a single route to the collection of destinations
140.191.0.0 through 140.191.255.255. A packet is always forwarded to the
network that is the best (longest or most specific) match for the packet’s
destination.
You can use the BCC or Site Manager to configure a summary route.
Using the BCC
To configure a summary route, go to an OSPF area prompt (for example,
box; ip;
ospf; area/0.0.0.2
) and enter:
summary network
<ip_address>
[
mask
<ip_mask>
]
ip_address
and
ip_mask
are an IP address/mask pair defining the summary route.
(If you do not explicitly configure the mask value, the natural address class mask
is configured.)
For example, the following command creates the summary route 140.191.0.0 with
a mask of 255.255.0.0:
area/0.0.0.1#
summary network 140.191.0.0 mask 255.255.0.0
summary/0.0.0.1/140.191.0.0#
By default, OSPF advertises the summary route. To change the setting, go
to the summary route prompt (for example,
box; ip; ospf; area/0.0.0.1;
summary/0.0.0.1/140.191.0.0
) and enter:
action
<action>
action
is one of the following:
advertise
(the default)
block
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