Dell Force10 MXL Blade - Filter Routes

378 | Open Shortest Path First (OSPFv2)
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Filter Routes
To filter routes, use prefix lists. OSPF applies prefix lists to incoming or outgoing routes. Incoming routes
must meet the conditions of the prefix lists, and if they do not, OSPF does not add the route to the routing
table. Configure the prefix list in CONFIGURATION PREFIX LIST mode prior to assigning it to the
OSPF process, To do this, use the following commands.
For configuration information on prefix lists, refer to the
IP Access Control Lists, Prefix Lists, and
Route-maps chapter in the FTOS Configuration Guide.
To apply prefix lists to incoming or outgoing OSPF routes, use the following commands in
CONFIGURATION-ROUTER OSPF mode.
Command Syntax Command Mode Usage
ip prefix-list prefix-name CONFIGURATION
Create a prefix list and assign it a unique
name. You are in PREFIX LIST mode.
seq sequence-number {deny |permit} ip-prefix
[ge min-prefix-length] [le max-prefix-length]
CONFIG- PREFIX
LIST
Create a prefix list with a sequence
number and a deny or permit action. The
optional parameters are:
ge min-prefix-length: is the minimum prefix
length to be matched (0 to 32).
le max-prefix-length: is the maximum prefix
length to be matched (0 to 32).
Command Syntax Command Mode Usage
distribute-list prefix-list-name in [interface] CONFIG-ROUTER-OSPF-id Apply a configured prefix list to
incoming OSPF routes.
distribute-list prefix-list-name out [connected
| ospf <process-id> | rip | static]
CONFIG-ROUTER-OSPF-id Assign a configured prefix list to
outgoing OSPF routes.