Implementation Information; Configuration Task List For Prefix Lists - Dell Force10 Z9000 Configuration Manual

The following rules apply to prefix lists:
• A prefix list without any permit or deny filters allows all routes.
• An "implicit deny" is assumed (that is, the route is dropped) for all route prefixes that do not match a
permit or deny filter in a configured prefix list.
• Once a route matches a filter, the filter's action is applied. No additional filters are applied to the route.

Implementation Information

In FTOS, prefix lists are used in processing routes for routing protocols (for example, RIP, OSPF, and
BGP).
Note: The S-Series platform does not support all protocols. It is important to know which protocol you are
supporting prior to implementing Prefix-Lists.

Configuration Task List for Prefix Lists

To configure a prefix list, you must use commands in the PREFIX LIST, the ROUTER RIP, ROUTER
OSPF, and ROUTER BGP modes. Basically, you create the prefix list in the PREFIX LIST mode, and
assign that list to commands in the ROUTER RIP, ROUTER OSPF and ROUTER BGP modes.
The following list includes the configuration tasks for prefix lists:
• Configure a prefix list
• Use a prefix list for route redistribution
For a complete listing of all commands related to prefix lists, refer to the
document.
Reference
Configure a prefix list
To configure a prefix list, use these commands in the following sequence, starting in the
CONFIGURATION mode:
Step Command Syntax
1 ip prefix-list prefix-name
seq sequence-number { deny |
2
permit } ip-prefix [ ge
min-prefix-length] [ le
max-prefix-length]
Command Mode
CONFIGURATION
CONFIG-NPREFIXL
FTOS Command Line Interface
Purpose
Create a prefix list and assign it a unique name.
You are in the PREFIX LIST mode.
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).
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