IP Routing Policy 125
Perform the following configurations in System View.
During the matching, the router checks list items identified by the index_number
in ascending order. If only one list item meets the condition, it means that it has
passed the
ip-prefix filtering (and does not enter the testing of the next list
item).
If more than one IP prefix item is defined, then the match mode of at least one list
item should be the
permit mode. The list items of the deny mode can be defined
to rapidly filter the routing information not satisfying the requirement, but if all
the items are in the
deny mode, no route will pass the ip-prefix filtering. You
can define an item of
permit 0.0.0.0/0 greater-equal 0 less-equal 32 after
the multiple list items in the
deny mode to let all the other routes pass.
Displaying and
Debugging the Routing
Policy
Enter the display command in any view to display the operation of the routing
policy configuration, and to verify the effect of the configuration.
Typical IP Routing Policy
Configuration Example
Configuring the Filtering of the Received Routing Information
Networking Requirements
■ Switch A communicates with Switch B, running RIP protocol.
■ Import three static routes by enabling the RIP protocol on Switch A.
■ The route filtering rules can be configured on Switch B to make the received
three static routes partially visible and partially shielded. This means that routes
in the network segments 20.0.0.0 and 40.0.0.0 are visible while those in the
network segment 30.0.0.0 are shielded.
Tab le 125 Defining Prefix-list
Operation Command
Define a Prefix-list ip ip-prefix ip_prefix_name [ index index_number ]
{ permit | deny } network len [ greater-equal
greater_equal ] [ less-equal less_equal ]
Remove a Prefix-list undo ip ip-prefix ip_prefix_name [ index
index_number | permit | deny ]
Tab le 126 Displaying and Debugging the Routing Policy
Operation Command
Display the routing policy display route-policy [ route_policy_name ]
Display the address prefix list
information
display ip ip-prefix [ ip_prefix_name ]
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