Service Manual

Configuration Task List for Prefix Lists
To configure a prefix list, use commands in PREFIX LIST, ROUTER RIP, ROUTER OSPF, and ROUTER BGP
modes.
Create the prefix list in PREFIX LIST mode and assign that list to commands in ROUTER RIP, ROUTER OSPF
and ROUTER BGP modes.
The following list includes the configuration tasks for prefix lists, as described in the following sections.
• Creating a Prefix List
• Applying a Prefix List for Route Redistribution
For a complete listing of all commands related to prefix lists, refer to the Dell Networking OS Command Line
Interface Reference Guide.
Creating a Prefix List
To create a prefix list, use the following commands.
1 Create a prefix list and assign it a unique name.
You are in PREFIX LIST mode.
CONFIGURATION mode
ip prefix-list prefix-name
2 Create a prefix list with a sequence number and a deny or permit action.
CONFIG-NPREFIXL mode
seq sequence-number {deny | permit} ip-prefix [ge min-prefix-length] [le max-
prefix-length]
The optional parameters are:
• ge min-prefix-length: the minimum prefix length to match (from 0 to 32).
• le max-prefix-length: the maximum prefix length to match (from 0 to 32).
Example of Assigning Sequence Numbers to Filters
If you want to forward all routes that do not match the prefix list criteria, configure a prefix list filter to permit
all routes (permit 0.0.0.0/0 le 32). The “permit all” filter must be the last filter in your prefix list. To
permit the default route only, enter
permit 0.0.0.0/0.
The following example shows how the seq command orders the filters according to the sequence number
assigned. In the example, filter 20 was configured before filter 15 and 12, but the show config command
displays the filters in the correct order.
Dell(conf-nprefixl)#seq 20 permit 0.0.0.0/0 le 32
Dell(conf-nprefixl)#seq 12 deny 134.23.0.0 /16
Dell(conf-nprefixl)#seq 15 deny 120.23.14.0 /8 le 16
Dell(conf-nprefixl)#show config
Access Control Lists (ACLs) 163