Dell Force10 C150 Configuration Manual page 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.
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.
Figure 8-7 illustrates how the
In the example, filter 15 was configured before filter 5, but the
in the correct order.
Figure 8-7. Command Example: seq
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)#
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:
Command Syntax
deny permit
{ | } {
source mask
count byte
ip-address } [ [
monitor] fragments
[ [ ]
deny permit tcp
{ | } { source mask
host ip-address count
}} [
order monitor] fragments
[ ] [ [
deny permit udp
{ | } {
source mask
host ip-address count
}} [
order monitor] fragments
[ ] [ [
When you use the
many packets match the log entry and at what rate, the CP may become busy as it has to log these packets'
details.
seq
command orders the filters according to the sequence number assigned.
Command Mode
any host
| | CONFIG-EXT-NACL
log order
] | ] [ ]
any
] | | CONFIG-EXT-NACL
byte log
[ ] | ]
]
any
| | CONFIG-EXT-NACL
byte log
[ ] | ]
]
log
keyword, CP processor logs details about the packets that match. Depending on how
show config
Purpose
Configure a deny or permit filter to
examine IP packets.
log and monitor options are
•
supported on E-Series only.
Configure a deny or permit filter to
examine TCP packets.
log and monitor options are
•
supported on E-Series only.
Configure a deny or permit filter to
examine UDP packets.
log and monitor options are
•
supported on E-Series only.
IP Access Control Lists (ACL), Prefix Lists, and Route-maps | 145
command displays the filters