Dell Force10 S4810P Configuration Manual page 124

Step Command Syntax
2
seq
sequence-number
permit }
min-prefix-length
max-prefix-length
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 (
prefix list. To permit the default route only, enter
The example below illustrates how the
assigned. In the example, filter 20 was configured before filter 15 and 12, but the
displays the filters in the correct order.
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)#
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
If you are creating a standard prefix list with only one or two filters, you can let FTOS assign a sequence
number based on the order in which the filters are configured. The FTOS assigns filters in multiples of
five.
To configure a filter without a specified sequence number, use these commands in the following sequence
starting in the CONFIGURATION mode:
Step Command Syntax
1 ip prefix-list
124
| Access Control Lists (ACLs)
{ deny |
[ ge
ip-prefix
] [ le
]
permit 0.0.0.0/0 le 32
no seq
sequence-number
prefix-name
Command Mode
CONFIG-NPREFIXL
). The "permit all" filter should be the last filter in your
permit 0.0.0.0/0
command orders the filters according to the sequence number
seq
command in the PREFIX LIST mode.
Command Mode
CONFIGURATION
Purpose
Create a prefix list with a sequence number
and a deny or permit action. The optional
parameters are:
• ge is the minimum
min-prefix-length:
prefix length to be matched (0 to 32).
• is the maximum
le
max-prefix-length:
prefix length to be matched (0 to 32).
.
show config
Purpose
Create a prefix list and assign it a unique
name.
command