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142 | IP Access Control Lists (ACL), Prefix Lists, and Route-maps
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Figure 8-4. 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:
When you use the
log keyword, CP processor logs details about the packets that match. Depending on how
many packets match the log entry and at what rate, the CP may become busy as it has to log these packets’
details.
Figure 8-5 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.
Figure 8-5. Standard IP ACL
To view all configured IP ACLs, use the show ip accounting access-list command (Figure 229) in the
EXEC Privilege mode.
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] |
log] [order] [monitor] [fragments]
CONFIG-STD-NACL Configure a drop or forward IP ACL filter.
• log and monitor options are supported
on E-Series only.
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)#
FTOS(config-route-map)#ip access standard kigali
FTOS(config-std-nacl)#permit 10.1.0.0/16
FTOS(config-std-nacl)#show config
!
ip access-list standard kigali
seq 5 permit 10.1.0.0/16
FTOS(config-std-nacl)#