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Dell Configuration Guide for the S4048–ON System 9.14.2.4

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Configure a Standard IP ACL

To configure an ACL, use commands in IP ACCESS LIST mode and INTERFACE mode.

For a complete list of all the commands related to IP ACLs, refer to the Dell EMC Networking OS Command Line Interface Reference Guide. To set up extended ACLs, refer to Configure an Extended IP ACL.
A standard IP ACL uses the source IP address as its match criterion.
  1. Enter IP ACCESS LIST mode by naming a standard IP access list.
    CONFIGURATION mode
    ip access-list standard access-listname
  2. Configure a drop or forward filter.
    CONFIG-STD-NACL mode
    seq sequence-number {deny | permit} {source [mask] | any | host ip-address} [count [byte] [dscp] [order] [monitor [session-id]] [fragments]
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.

To view the rules of a particular ACL configured on a particular interface, use the show ip accounting access-list ACL-name interface interface command in EXEC Privilege mode.

Example of Viewing the Rules of a Specific ACL on an Interface

The following is an example of viewing the rules of a specific ACL on an interface.

DellEMC#show ip accounting access-list ToOspf interface gig 1/6
Standard IP access list ToOspf
  seq 5 deny any
  seq 10 deny 10.2.0.0 /16
  seq 15 deny 10.3.0.0 /16
  seq 20 deny 10.4.0.0 /16
  seq 25 deny 10.5.0.0 /16
  seq 30 deny 10.6.0.0 /16
  seq 35 deny 10.7.0.0 /16
  seq 40 deny 10.8.0.0 /16
  seq 45 deny 10.9.0.0 /16
  seq 50 deny 10.10.0.0 /16
DellEMC#

The following example shows how the seq command orders the filters according to the sequence number assigned. In the example, filter 25 was configured before filter 15, but the show config command displays the filters in the correct order.

DellEMC(config-std-nacl)#seq 25 deny ip host 10.5.0.0 any log
DellEMC(config-std-nacl)#seq 15 permit tcp 10.3.0.0 /16 any monitor 300
DellEMC(config-std-nacl)#show config
!
ip access-list standard dilling
  seq 15 permit tcp 10.3.0.0/16 any monitor 300
  seq 25 deny ip host 10.5.0.0 any log
DellEMC(config-std-nacl)#
To delete a filter, use the no seq sequence-number command in IP ACCESS LIST mode. If you are creating a standard ACL with only one or two filters, you can let Dell EMC Networking OS assign a sequence number based on the order in which the filters are configured. The software assigns filters in multiples of 5.

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