Users Guide
• Conguring a prex list
• Use a prex list for route redistribution
For a complete listing of all commands related to prex lists, refer to the Dell Networking OS Command Line Interface Reference Guide.
Creating a Prex List
To create a prex list, use the following commands.
1 Create a prex list and assign it a unique name.
You are in PREFIX LIST mode.
CONFIGURATION mode
ip prefix-list prefix-name
2 Create a prex 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 prex length to match (from 0 to 32).
• le max-prefix-length: the maximum prex 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 prex list criteria, congure a prex list lter to permit all routes (permit
0.0.0.0/0 le 32). The “permit all” lter must be the last lter in your prex list. To permit the default route only, enter permit
0.0.0.0/0
.
The following example shows how the seq command orders the lters according to the sequence number assigned. In the example, lter
20 was congured before lter 15 and 12, but the
show config command displays the lters 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
!
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
Dell(conf-nprefixl)#
NOTE
: The last line in the prex list Juba contains a “permit all” statement. By including this line in a prex list, you specify that
all routes not matching any criteria in the prex list are forwarded.
To delete a
lter, use the no seq sequence-number command in PREFIX LIST mode.If you are creating a standard prex list with only
one or two lters, you can let Dell Networking OS assign a sequence number based on the order in which the lters are congured. The
Dell Networking OS assigns lters in multiples of ve.
Creating a Prex List Without a Sequence Number
To create a lter without a specied sequence number, use the following commands.
1 Create a prex list and assign it a unique name.
CONFIGURATION mode
Access Control Lists (ACLs)
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