3com 8807 Reference Guide
OSPF Configuration Commands
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In some situations, it may be required that only some Type-3 LSAs meeting a
certain condition be advertised. In this case, you can define a Filter-policy to set the
filter condition for advertised Type-3 LSAs so that only the Type-3 LSAs having
passed the filtration can be advertised.
certain condition be advertised. In this case, you can define a Filter-policy to set the
filter condition for advertised Type-3 LSAs so that only the Type-3 LSAs having
passed the filtration can be advertised.
Use the filter-policy export command to filter the Type-3 LSAs generated locally
in an OSPF area so that only those Type-3 LSAs having passed the filtration can be
added into the link state database of the other areas. The filtration is implemented
according to the link state ID of the Type-3 LSAs.
in an OSPF area so that only those Type-3 LSAs having passed the filtration can be
added into the link state database of the other areas. The filtration is implemented
according to the link state ID of the Type-3 LSAs.
Related command: acl, ip ip-prefix.
Example
# Configure the filter condition so that the OSPF backbone area advertises only
those Type-3 LSAs having passed ACL 2000.
those Type-3 LSAs having passed ACL 2000.
[SW8800] acl number 2000
[3Com-acl-basic-2000] rule permit source 11.0.0.0 0.255.255.255
[3Com-acl-basic-2000] rule deny source any
[3Com-ospf-1-area-0.0.0.1] filter-policy 2000 export
filter-policy import
Syntax
filter-policy { acl-number | ip-prefix ip-prefix-name | gateway ip-prefix-name }
import
import
undo filter-policy { acl-number | ip-prefix ip-prefix-name | gateway
ip-prefix-name } import
ip-prefix-name } import
View
OSPF view
Parameter
acl-number: Number of a basic or advanced access control list used for filtering
the destination addresses of the routing information.
the destination addresses of the routing information.
ip-prefix-name: Name of the address prefix list used for filtering the destination
addresses of the routing information.
addresses of the routing information.
gateway ip-prefix-name: Name of the address prefix list used for filtering the
addresses of the neighboring routers advertising the routing information.
addresses of the neighboring routers advertising the routing information.
Description
Use the filter-policy import command to configure the OSPF rules of filtering the
routing information received.
routing information received.
Use the undo filter-policy import command to cancel the filtering of the routing
information received.
information received.
By default, no filtering of the received routing information is performed.
In some cases, it may be required that only the routing information meeting some
conditions can be received. Then, the filter-policy command can be used to set
conditions can be received. Then, the filter-policy command can be used to set