HP Cisco Catalyst Blade Switch 3020 Cisco Catalyst Blade Switch 3020 for HP So - Page 507
Hardware and Software Treatment of IP ACLs, IPv4 ACL Configuration Examples, Numbered ACLs
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Chapter 26 Configuring Network Security with ACLs Configuring IPv4 ACLs Hardware and Software Treatment of IP ACLs ACL processing is primarily accomplished in hardware, but requires forwarding of some traffic flows to the CPU for software processing. If the hardware reaches its capacity to store ACL configurations, packets are sent to the CPU for forwarding. The forwarding rate for software-forwarded traffic is substantially less than for hardware-forwarded traffic. If ACLs cause large numbers of packets to be sent to the CPU, the switch performance can be negatively affected. When you enter the show ip access-lists privileged EXEC command, the match count displayed does not account for packets that are access controlled in hardware. Use the show access-lists hardware counters privileged EXEC command to obtain some basic hardware ACL statistics for switched packets. IPv4 ACL Configuration Examples This section provides examples of configuring and applying IPv4 ACLs. For detailed information about compiling ACLs, see the Cisco IOS Security Configuration Guide, Release 12.2 and to the Configuring IP Services" section in the "IP Addressing and Services" chapter of the Cisco IOS IP Configuration Guide, Release 12.2. This example uses a standard ACL to allow a port access to a specific Internet host with the address 172.20.128.64. Switch(config)# access-list 6 permit 172.20.128.64 0.0.0 Switch(config)# end Switch# show access-lists Standard IP access list 6 10 permit 172.20.128.64 wildcard bits 0.0.0.0 Switch(config)# interface gigabitethernet0/1 Switch(config-if)# ip access-group 6 in This example uses an extended ACL to deny to a port traffic coming from port 80 (HTTP). It permits all other types of traffic. Switch(config)# access-list 106 deny tcp any any eq 80 Switch(config)# access-list 106 permit ip any any Switch(config)# end Switch(config)# interface gigabitethernet0/1 Switch(config-if)# ip access-group 106 in Numbered ACLs This ACL accepts addresses on network 36.0.0.0 subnets and denies all packets coming from 56.0.0.0 subnets. The ACL is applied to packets entering a port. Switch(config)# access-list 2 permit 36.0.0.0 0.255.255.255 Switch(config)# access-list 2 deny 56.0.0.0 0.255.255.255 Switch(config)# interface gigabitethernet0/1 Switch(config-if)# ip access-group 2 in Extended ACLs In this example, suppose that you have a network connected to the Internet, and you want any host on the network to be able to form TCP connections to any host on the Internet. However, you do not want IP hosts to be able to form TCP connections to hosts on your network, except to the mail (SMTP) port of a dedicated mail host. OL-8915-01 Cisco Catalyst Blade Switch 3020 for HP Software Configuration Guide 26-19
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