Dell Force10 E300, Configuration Manual

Page: 145 / 1262

IP Access Control Lists (ACL), Prefix Lists, and Route-maps | 145
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 8-7 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.
Figure 8-7. Command Example:
seq
Configure filters without sequence number
If you are creating an extended 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. FTOS assigns filters in multiples of 5.
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.
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.
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.
FTOS(config-ext-nacl)# seq 15 deny ip host 112.45.0.0 any log
FTOS(config-ext-nacl)# seq 5 permit tcp 12.1.3.45 0.0.255.255 any
FTOS(config-ext-nacl)#show confi
!
ip access-list extended dilling
seq 5 permit tcp 12.1.0.0 0.0.255.255 any
seq 15 deny ip host 112.45.0.0 any log
FTOS(config-ext-nacl)#