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Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide
78-11380-12
Chapter 28 Configuring Network Security with ACLs
Configuring ACLs
Switch(config)# access-list 1 permit 171.69.2.88
Switch(config)# access-list 1 remark Do not allow Smith workstation through
Switch(config)# access-list 1 deny 171.69.3.13
For an entry in a named IP ACL, use the remark access-list global configuration command. To remove
the remark, use the no form of this command.
In this example, the Jones subnet is not allowed to use outbound Telnet:
Switch(config)# ip access-list extended telnetting
Switch(config-ext-nacl)# remark Do not allow Jones subnet to telnet out
Switch(config-ext-nacl)# deny tcp host 171.69.2.88 any eq telnet
Creating Named MAC Extended ACLs
You can filter Layer 2 traffic on a physical Layer 2 interface by using MAC addresses and named MAC
extended ACLs. The procedure is similar to that of configuring other extended named access lists.
Note Named MAC extended ACLs are used as a part of the mac access-group privileged EXEC command.
For more information about the supported non-IP protocols in the mac access-list extended command,
see the command reference for this release.
Note Matching on any SNAP-encapsulated packet with a nonzero Organizational Unique Identifier (OUI) is
not supported.
Beginning in privileged EXEC mode, follow these steps to create a named MAC extended ACL:
Use the no mac access-list extended name global configuration command to delete the entire ACL. You
can also delete individual ACEs from named MAC extended ACLs.
This example shows how to create and display an access list named mac1, denying only EtherType
DECnet Phase IV traffic, but permitting all other types of traffic.
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
mac access-list extended name Define an extended MAC access list by using a name.
Step 3
{deny | permit} {any | host source MAC
address} {any | host destination MAC address}
[aarp | amber | appletalk | dec-spanning |
decnet-iv | diagnostic | dsm | etype-6000 |
etype-8042 | lat | lavc-sca | mop-console |
mop-dump | msdos | mumps | netbios |
vines-echo |vines-ip | xns-idp]
In extended MAC access-list configuration mode, specify to
permit or deny any source MAC address or a specific host source
MAC address and any destination MAC address.
(Optional) You can also enter these options:
aarp | amber | appletalk | dec-spanning | decnet-iv |
diagnostic | dsm | etype-6000 | etype-8042 | lat | lavc-sca |
mop-console | mop-dump | msdos | mumps | netbios
|
vines-echo |vines-ip | xns-idp—(a non-IP protocol).
Step 4
end Return to privileged EXEC mode.
Step 5
show access-lists [number | name] Show the access list configuration.
Step 6
copy running-config startup-config (Optional) Save your entries in the configuration file.
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