Reference Guide

96 | Access Control Lists (ACL), Prefix Lists, and Route-maps
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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.
UDP packets: To create a filter for UDP packets with a specified sequence number, use these commands
in the following sequence, starting in the CONFIGURATION mode:
When you create the filters with a specific sequence number, you can create the filters in any order and the
filters are placed in the correct order.
Figure 6-7 illustrates how the
seq command orders the filters according to the sequence number assigned.
In the example, filter 15 was configured before filter 5, but the
show config command displays the filters
in the correct order.
2
seq
sequence-number
{
deny | permit} tcp
{source mask |
any |
host ip-address}}
[
count [byte] | log ]
[
order] [monitor]
[fragments]
CONFIG-EXT-NACL Configure an extended IP ACL filter for TCP
packets.
•
log and monitor options are supported on
E-Series only.
Step Command Syntax Command Mode Purpose
1
ip access-list extended
access-list-name
CONFIGURATION Create a extended IP ACL and assign it a unique
name.
2 seq
sequence-number
{
deny | permit}
{ip-protocol-number
udp} {source mask |
any | host
ip-address}
{destination mask |
any | host
ip-address}
[operator port [port]]
[
count [byte] | log ]
[
order] [monitor]
[
fragments]
CONFIG-EXT-NACL Configure an extended IP ACL filter for UDP
packets.
•
log and monitor options are supported on
E-Series only.
Note: When assigning sequence numbers to filters, keep in mind that you might need to insert a
new filter. To prevent reconfiguring multiple filters, assign sequence numbers in multiples of five or
another number.
Step Command Syntax Command Mode Purpose