Reference Guide

{deny | permit} {source [mask] | any | host ip-address} [count [byte]]

[order] [fragments]

When you use the log keyword, the CP 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.

The following example shows a standard IP ACL in which FTOS assigns the sequence numbers. 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 IP ACCESS LIST mode displays the two filters with the

sequence numbers 5 and 10.

Example of Viewing Filter Sequence for a Specified Standard ACL

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 seq 10 deny tcp any any eq 111

FTOS(config-std-nacl)#

To view all configured IP ACLs, use the show ip accounting access-list command in EXEC Privilege mode.

Example of Viewing Standard ACL Filter Sequence for an Interface

FTOS#show ip accounting access example interface gig 4/12

Extended IP access list example

seq 10 deny tcp any any eq 111

seq 15 deny udp any any eq 111

seq 20 deny udp any any eq 2049

seq 25 deny udp any any eq 31337

seq 30 deny tcp any any range 12345 12346

seq 35 permit udp host 10.21.126.225 10.4.5.0 /28

seq 40 permit udp host 10.21.126.226 10.4.5.0 /28

seq 45 permit udp 10.8.0.0 /16 10.50.188.118 /31 range 1812 1813

seq 50 permit tcp 10.8.0.0 /16 10.50.188.118 /31 eq 49

seq 55 permit udp 10.15.1.0 /24 10.50.188.118 /31 range 1812 1813

To delete a filter, enter the show config command in IP ACCESS LIST mode and locate the sequence number of the

filter you want to delete. Then use the

no seq sequence-number command in IP ACCESS LIST mode.

Configure an Extended IP ACL

Extended IP ACLs filter on source and destination IP addresses, IP host addresses, TCP addresses, TCP host addresses,

UDP addresses, and UDP host addresses.

Because traffic passes through the filter in the order of the filter’s sequence, you can configure the extended IP ACL by

first entering IP ACCESS LIST mode and then assigning a sequence number to the filter.

Configuring Filters with a Sequence Number

To configure filters with a sequence number, use the following commands.

1. Enter IP ACCESS LIST mode by creating an extended IP ACL.

CONFIGURATION mode

ip access-list extended access-list-name

2. Configure a drop or forward filter.

CONFIG-EXT-NACL mode