DELL S50V User Manual

|

IP Access Control Lists (ACL), Prefix Lists, and Route-maps

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The following list includes the configuration tasks for prefix lists:

•

•

 

For a complete listing of all commands related to prefix lists, refer to the 

 document.

Configure a prefix list

To configure a prefix list, use these commands in the following sequence, starting in the 
CONFIGURATION mode: 

If you want to forward all routes that do not match the prefix list criteria, you must configure a prefix list 
filter to permit all routes (

). The “permit all” filter should be the last filter in your 

prefix list. To permit the default route only, enter 

.

 command orders the filters according to the sequence number assigned. 

In the example, filter 20 was configured before filter 15 and 12, but the 

 command displays 

the filters in the correct order.

Note the last line in the prefix list Juba contains a “permit all” statement. By including this line in a prefix 
list, you specify that all routes not matching any criteria in the prefix list are forwarded. 

To delete a filter, use the 

 

 command in the PREFIX LIST mode.

1

 

CONFIGURATION 

Create a prefix list and assign it a unique 
name.
You are in the PREFIX LIST mode.

2

 

 {

 | 

} 

 [

 

] [

 

]

CONFIG-NPREFIXL

Create a prefix list with a sequence number 
and a deny or permit action. The optional 
parameters are:

•

 

is the minimum 

prefix length to be matched (0 to 32).

•

 

 is the maximum 

prefix length to be matched (0 to 32).

FTOS(conf-nprefixl)#seq 20 permit 0.0.0.0/0 le 32 

FTOS(conf-nprefixl)#seq 12 deny 134.23.0.0 /16 

FTOS(conf-nprefixl)#seq 15 deny 120.23.14.0 /8 le 16

FTOS(conf-nprefixl)#show config

!

ip prefix-list juba

 seq 12 deny 134.23.0.0/16

 seq 15 deny 120.0.0.0/8 le 16

 seq 20 permit 0.0.0.0/0 le 32

FTOS(conf-nprefixl)#