3Com 3032 Configuration Manual page 489

D
efining an IP Prefix List
C
onfiguring Route Filter
type is the type of ospf external route corresponding to the imported route when
ospf is importing other protocol routes.
refers to external route type 2.
type 2
The metric value of the imported route can be set as the following:
1 Specify the metric value with the
2 Filter the route with routing policy and set attributes for the route matching the
conditions.
3 If neither of the above is specified, the imported route uses the default metric
value. The default metric can be specified with the
When both routing policy and med value are specified, the routing information
matching the routing policy will use the metric specified by the
of a routing policy.
An IP prefix list is identified with the list name and consists of several parts, with
the sequence-number specifying the matching order of these parts. In each part,
you can specify an individual matching range in the form of network prefix.
It should be noted that:
In the process of matching, different parts of different sequence-numbers use
Boolean "OR" operations and the routing information matches different parts
in turn. Matched with a specific part of the IP prefix list is considered as
successfully filter through this IP prefix list
Perform the following configurations in system view.
Table 564 Define an IP Prefix List
Operation
Define an IP prefix list
Cancel an IP prefix list
By default, no IP prefix list is defined.
In some cases, only the routing information that meets the condition should be
distributed or imported, to prevent the neighboring routers from receiving private
information of other routes. A prefix-list or access list in the route strategy is used
to filter the routing information.
Perform the following configurations in RIP view, OSPF view, or BGP view.
1 Configure filtering route information received
Define a strategic rule and quote an ACL or prefix-list to filter the routing
information that does not meet the requirements when receiving routes. Specify
an IP prefix list through gateway keywords, filtering the address of the
information router to receive only the updating messages from specific
neighboring routers.
Configure IP Routing Policy
refers to external route type 1 and
type 1
command.
apply cost
default-med
Command
ip ip-prefix prefix-list-name [
index index-number ] { permit | deny
} network/len [ greater-equal
ge-value ] [ less-equal le-value ]
undo ip ip-prefix prefix-list-name [
index seq-number ] [ permit | deny ]
485
command.
command
apply