Cisco ASR 9000 Series

Area-in
The area-in attach point within OSPF allows you to filter inbound OSPF type-3 summary link-state
advertisements (LSAs). The attach point provides prefix-based matching and hence increased control for
filtering type-3 summary LSAs.
The following example shows how to configure the prefix for OSPF summary LSAs. If the prefix matches
any of 10 .105.3.0/24, 10 .105.7.0/24, 10 .105.13.0/24, it is accepted. If the prefix matches any of 10 .106.3.0/24,
10 .106.7.0/24, 10 .106.13.0/24, it is dropped.
route-policy OSPF-area-in
if destination in (10
.105.3.0/24, 10
.105.7.0/24, 10
.105.13.0/24) then
drop
endif
if destination in (10
.106.3.0/24, 10
.106.7.0/24, 10
.106.13.0/24) then
pass
endif
end-policy
router ospf 1
area 1
route-policy OSPF-area-in in
Area-out
The area-out attach point within OSPF allows you to filter outbound OSPF type-3 summary LSAs. The attach
point provides prefix-based matching and, hence, increased control for filtering type-3 summary LSAs.
The following example shows how to configure the prefix for OSPF summary LSAs. If the prefix matches
any of 10 .105.3.0/24, 10 .105.7.0/24, 10 .105.13.0/24, it is announced. If the prefix matches any of
10.105.3.0/24, 10 .105.7.0/24, 10 .105.13.0/24, it is dropped and not announced.
route-policy OSPF-area-out
if destination in (10
.105.3.0/24, 10
.105.7.0/24, 10
.105.13.0/24) then
drop
endif
if destination in (10
.105.3.0/24, 10
.105.7.0/24, 10
.105.13.0/24) then
pass
endif
end-policy
router ospf 1
area 1
route-policy OSPF-area-out out
Cisco ASR 9000 Series Aggregation Services Router Routing Configuration Guide, Release 5.3.x
594
Implementing Routing Policy
Attach Points