When you specify the summary-only keyword, all specific prefixes are suppressed. It is possible to suppress prefixes selectively, using a route-map associated via the parameter suppress-map
Combine a
suppress-map with aggregate-address to define which networks should be
suppressed. Remember, by default both the aggregate and the more specifics get
announced unless you use summary-only.
ip
access-list standard 20
permit 10.1.1.0 0.0.0.255
route-map SUPPRESS-MAP 10
match ip address 20
router bgp 200
aggregate-address 10.1.1.0 255.255.252.0
suppress-map SUPPRESS-MAP
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