Reference Guide

110 | Access Control Lists (ACL), Prefix Lists, and Route-maps
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To view the rules of a particular ACL configured on a particular interface, use the show ip accounting
access-list
ACL-name interface interface command (Figure 226) in EXEC Privilege mode.
Figure 7-3. Command Example: show ip accounting access-list
Figure 7-4 illustrates how the seq command orders the filters according to the sequence number assigned.
In the example, filter 25 was configured before filter 15, but the
show config command displays the filters
in the correct order.
Figure 7-4. Command example: seq
To delete a filter, use the no seq sequence-number command in the IP ACCESS LIST mode.
If you are creating a standard ACL 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 software assigns filters in multiples of 5.
To configure a filter without a specified sequence number, use these commands in the following sequence,
starting in the CONFIGURATION mode:
Figure 7-5 illustrates a standard IP ACL in which the sequence numbers were assigned by the FTOS. The
filters were assigned sequence numbers based on the order in which they were configured (for example,
the first filter was given the lowest sequence number). The
show config command in the IP ACCESS
LIST mode displays the two filters with the sequence numbers 5 and 10.
Step Command Syntax Command Mode Purpose
1 ip access-list standard
access-list-name
CONFIGURATION Create a standard IP ACL and assign it a
unique name.
2
{deny | permit} {source [mask] | any
| host
ip-address} [count [byte] ]
[
order] [monitor] [fragments]
CONFIG-STD-NACL Configure a drop or forward IP ACL filter.
•
FTOS#show ip accounting access ToOspf interface gig 1/6
Standard IP access list ToOspf
seq 5 deny any
seq 10 deny 10.2.0.0 /16
seq 15 deny 10.3.0.0 /16
seq 20 deny 10.4.0.0 /16
seq 25 deny 10.5.0.0 /16
seq 30 deny 10.6.0.0 /16
seq 35 deny 10.7.0.0 /16
seq 40 deny 10.8.0.0 /16
seq 45 deny 10.9.0.0 /16
seq 50 deny 10.10.0.0 /16
FTOS#
FTOS(config-std-nacl)#seq 25 deny ip host 10.5.0.0 any log
FTOS(config-std-nacl)#seq 15 permit tcp 10.3.0.0 /16 any
FTOS(config-std-nacl)#show config
!
ip access-list standard dilling
seq 15 permit tcp 10.3.0.0/16 any
seq 25 deny ip host 10.5.0.0 any log
FTOS(config-std-nacl)#