Cisco 500 Series, Руководство по настройке

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16-10
Cisco Security Appliance Command Line Configuration Guide
OL-12172-03
Chapter 16 Identifying Traffic with Access Lists
Adding a Standard Access List
Adding an EtherType ACE
To add an EtherType ACE, enter the following command:
hostname(config)# access-list access_list_name ethertype { permit | deny } { ipx | bpdu |
mpls-unicast | mpls-multicast | any | hex_number }
The hex_number is any EtherType that can be identified by a 16-bit hexadecimal number greater than or
equal to 0x600. See RFC 1700, “Assigned Numbers,” at http://www.ietf.org/rfc/rfc1700.txt for a list of
EtherTypes.
Note
If an EtherType access list is configured to deny all , all ethernet frames are discarded. Only physical
protocol traffic, such as auto-negotiation, is still allowed.
When you enter the access-list command for a given access list name, the ACE is added to the end of
the access list.
Tip Enter the access_list_name in upper case letters so the name is easy to see in the configuration. You
might want to name the access list for the interface (for example, INSIDE), or for the purpose (for
example, MPLS or IPX).
For example, the following sample access list allows common EtherTypes originating on the inside
interface:
hostname(config)# access-list ETHER ethertype permit ipx
hostname(config)# access-list ETHER ethertype permit bpdu
hostname(config)# access-list ETHER ethertype permit mpls-unicast
hostname(config)# access-group ETHER in interface inside
The following access list allows some EtherTypes through the security appliance, but denies IPX:
hostname(config)# access-list ETHER ethertype deny ipx
hostname(config)# access-list ETHER ethertype permit 0x1234
hostname(config)# access-list ETHER ethertype permit bpdu
hostname(config)# access-list ETHER ethertype permit mpls-unicast
hostname(config)# access-group ETHER in interface inside
hostname(config)# access-group ETHER in interface outside
The following access list denies traffic with EtherType 0x1256, but allows all others on both interfaces:
hostname(config)# access-list nonIP ethertype deny 1256
hostname(config)# access-list nonIP ethertype permit any
hostname(config)# access-group ETHER in interface inside
hostname(config)# access-group ETHER in interface outside
Adding a Standard Access List
Single context mode only
Standard access lists identify the destination IP addresses of OSPF routes, and can be used in a route
map for OSPF redistribution. Standard access lists cannot be applied to interfaces to control traffic.
The following command adds a standard ACE. To add another ACE at the end of the access list, enter
another
access-list command specifying the same access list name. Apply the access list using the
“Defining Route Maps” section on page 9-6 .