Configuration Analysis:
OnR2, the following configuration has been applied:
acl 200
rule deny source 10.1.0.0 0.0.3.0
rule permit
#
ospf 1
filter-policy 2000 import
This configuration usesACL 200to filter routes during import into the OSPF routing table on R2.
Rule deny source 10.1.0.0 0.0.3.0:Blocks routes in the range10.1.0.0/24 to 10.1.3.0/24(inclusive).
Rule permit:Allows all other routes to be imported.
Impact of ACL 200 on Route Import:
10.1.0.0/24 to 10.1.3.0/24:These subnets are explicitly denied by ACL 200 and will not appear in R2's routing table.
10.1.4.0/24 and beyond:These subnets are permitted by therule permitstatement and will be imported into R2's routing table.
Routing Table Entries on R2:
Option A (10.1.4.0/24):Exists in R2's routing table because it is permitted.
Option B (10.1.3.0/24):Does not exist because it is denied by ACL 200.
Option C (10.1.2.0/24):Does not exist because it is denied by ACL 200.
Option D (10.1.1.0/24):Does not exist because it is denied by ACL 200.
A (10.1.4.0/24)
[References:, HCIA-Datacom Study Guide, Chapter: OSPF Route Filtering, Huawei ACL Configuration for Route Policies, , , , ]
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