Connectivity Guide

Table 58. L2 and L3 targeted trac
L2 ACL / L3 ACL Targeted trac
Deny / Deny L3 ACL denies
Deny / Permit L3 ACL permits
Permit / Deny L3 ACL denies
Permit / Permit L3 ACL permits
Assign and apply ACL lters
To lter an Ethernet interface, a port-channel interface, or a VLAN, assign an IP ACL lter to a physical interface. The IP ACL applies to all
trac entering a physical or port-channel interface. The trac either forwards or drops depending on the criteria and actions you congure
in the ACL lter.
To change the ACL lter functionality, apply the same ACL lters to dierent 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 lter using the out keyword, it becomes an egress ACL.
You can apply an IP ACL lter to a physical or port-channel interface. The number of ACL lters allowed is hardware-dependent.
1 Enter the interface information in CONFIGURATION mode.
interface ethernet node/slot/port
2 Congure an IP address for the interface, placing it in L3 mode in INTERFACE mode.
ip address ip-address
3 Apply an IP ACL lter to trac entering or exiting an interface in INTERFACE mode.
ip access-group access-list-name {in | out}
Congure 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 lters 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)
seq 110 permit tcp any any fin syn rst psh ack urg count (0 packets)
seq 120 deny icmp 20.1.6.0/24 any fragment count (0 packets)
seq 130 permit 150 any any dscp 63 count (0 packets)
To view the number of packets matching the ACL, use the count option when creating ACL entries.
• Create an ACL that uses rules with the count option, see Assign sequence number to lter.
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Access Control Lists