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OmniAccess 5740 Unified Services Gateway CLI Configuration Guide
Alcatel-Lucent
T
O CONFIGURE ROUTE SUMMARIZATION
Though the stub areas conserve resources within non-backbone areas by
preventing certain LSA's from entering, these areas do nothing to conserve
resources on the backbone. Address Summarization conserves resources by
reducing the number of LSA's being flooded and by hiding instabilities. An ABR
can be configured to advertise a summary address either into backbone or into a
non-backbone area. The best practice is that a non-backbone area address
should be summarized into backbone by its own ABR as opposed to having all
other ABR's summarize the area address into their areas.
When routes from other protocols are redistributed into OSPF, each route is
advertised individually in an external LSA. However, you can configure
OmniAccess 5740 USG to advertise a single route for all the redistributed routes
that are covered by a specified network address and mask. This helps decrease
the size of the OSPF link-state database.
To advertise one summary route for all redistributed routes covered by a network
address and mask, enter the following command:
E
XAMPLE
ALU(config-router ospf 1)# summary-address 20.0.0.0/8 tag 20
ALU(config-router ospf 1)# summary-address 10.0.0.0/8 not
advertise
Command (in RCM) Description
summary-address {<ip-address
subnet-mask|<ip-address/prefix-
length>} [not-advertise|tag <0-
4294967295>]
Specifies an address and mask that
covers redistributed routes, so only
one summary route is advertised.
Use the optional not-advertise
keyword to filter out a set of routes.
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