API Guide

Rules apply in order:
● Ingress L3 ACL
● Ingress L2 ACL
● Egress L3 ACL
● Egress L2 ACL
NOTE: In ingress ACLs, L2 has a higher priority than L3 and in egress ACLs, L3 has a higher priority than L2.
Table 113. L2 and L3 targeted traffic
L2 ACL / L3 ACL Targeted traffic
Deny / Deny L3 ACL denies
Deny / Permit L3 ACL permits
Permit / Deny L3 ACL denies
Permit / Permit L3 ACL permits
Assign and apply ACL filters
To filter an Ethernet interface, a port-channel interface, or a VLAN, assign an IP ACL filter to the corresponding interface. The
IP ACL applies to all traffic entering a physical, port-channel, or VLAN interface. The traffic either forwards or drops depending
on the criteria and actions you configure in the ACL filter.
To change the ACL filter functionality, apply the same ACL filters to different interfaces. For example, take ACL “ABCD” and
apply it using the in keyword and it becomes an ingress ACL. If you apply the same ACL filter using the out keyword, it
becomes an egress ACL.
You can apply an IP ACL filter to a physical, port-channel, or VLAN interface. The number of ACL filters allowed is hardware-
dependent.
1. Enter the interface information in CONFIGURATION mode.
interface ethernet node/slot/port
2. Configure an IP address for the interface, placing it in L3 mode in INTERFACE mode.
ip address ip-address
3. Apply an IP ACL filter to traffic entering or exiting an interface in INTERFACE mode.
ip access-group access-list-name {in | out}
Configure IP ACL
OS10(config)# interface ethernet 1/1/28
OS10(conf-if-eth1/1/28)# ip address 10.1.2.0/24
OS10(conf-if-eth1/1/28)# ip access-group abcd in
View ACL filters applied to interface
OS10# show ip access-lists in
Ingress IP access-list acl1
Active on interfaces :
ethernet1/1/28
seq 10 permit ip host 10.1.1.1 host 100.1.1.1 count (0 packets)
seq 20 deny ip host 20.1.1.1 host 200.1.1.1 count (0 packets)
seq 30 permit ip 10.1.2.0/24 100.1.2.0/24 count (0 packets)
seq 40 deny ip 20.1.2.0/24 200.1.2.0/24 count (0 packets)
seq 50 permit ip 10.0.3.0 255.0.255.0 any count (0 packets)
seq 60 deny ip 20.0.3.0 255.0.255.0 any count (0 packets)
seq 70 permit tcp any eq 1000 100.1.4.0/24 eq 1001 count (0 packets)
seq 80 deny tcp any eq 2100 200.1.4.0/24 eq 2200 count (0 packets)
seq 90 permit udp 10.1.5.0/28 eq 10000 any eq 10100 count (0 packets)
seq 100 deny tcp host 20.1.5.1 any rst psh count (0 packets)
1118
Access Control Lists