Reference Guide

Access Control Lists (ACLs) | 111
To configure a filter for an extended IP ACL without a specified sequence number, use any or all of the
following commands in the IP ACCESS LIST 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.
The following example illustrates an extended IP ACL in which the sequence numbers were assigned by
the software. 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.
FTOS(config-ext-nacl)#deny tcp host 123.55.34.0 any
FTOS(config-ext-nacl)#permit udp 154.44.123.34 0.0.255.255 host 34.6.0.0
FTOS(config-ext-nacl)#show config
!
ip access-list extended nimule
seq 5 deny tcp host 123.55.34.0 any
seq 10 permit udp 154.44.0.0 0.0.255.255 host 34.6.0.0
FTOS(config-ext-nacl)#
To view all configured IP ACLs and the number of packets processed through the ACL, use the show ip
accounting access-list
command in the EXEC Privilege mode as shown in the first example in Configure
a standard IP ACL.
Established Flag
The est (established) flag is deprecated for Terascale series line cards.The flag is only available on legacy
EtherScale linecards. Employ the
ack and rst flags instead to achieve the same functionality.
To obtain the functionality of
est, use the following ACLs:
• permit tcp any any rst
• permit tcp any any ack
Command Syntax Command Mode Purpose
{deny | permit} {source mask | any
|
host ip-address} [count [byte] |
log ] [order] [monitor] [fragments]
CONFIG-EXT-NACL Configure a deny or permit filter to
examine IP packets.
•
log and monitor options are
supported on E-Series only.
{deny | permit} tcp {source mask] |
any | host ip-address}} [count
[
byte] | log ] [order] [monitor]
[fragments]
CONFIG-EXT-NACL Configure a deny or permit filter to
examine TCP packets.
• log and monitor options are
supported on E-Series only.
{deny | permit} udp {source mask |
any | host ip-address}} [count
[
byte] | log ] [order] [monitor]
[fragments]
CONFIG-EXT-NACL Configure a deny or permit filter to
examine UDP packets.
• log and monitor options are
supported on E-Series only.