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Cisco Catalyst Blade Switch 3130 and 3032 for Dell Software Configuration Guide
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Chapter 34 Configuring Network Security with ACLs
Configuring IPv4 ACLs
This example uses named ACLs to permit and deny the same traffic.
Switch(config)#
ip access-list extended deny_access
Switch(config-ext-nacl)#
deny tcp any any time-range new_year_day_2006
Switch(config-ext-nacl)#
exit
Switch(config)#
ip access-list extended may_access
Switch(config-ext-nacl)#
permit tcp any any time-range workhours
Switch(config-ext-nacl)#
end
Switch#
show ip access-lists
Extended IP access list lpip_default
10 permit ip any any
Extended IP access list deny_access
10 deny tcp any any time-range new_year_day_2006 (inactive)
Extended IP access list may_access
10 permit tcp any any time-range workhours (inactive)
Including Comments in ACLs
You can use the
remark
keyword to include comments (remarks) about entries in any IP standard or
extended ACL. The remarks make the ACL easier for you to understand and scan. Each remark line is
limited to 100 characters.
The remark can go before or after a permit or deny statement. You should be consistent about where you
put the remark so that it is clear which remark describes which permit or deny statement. For example,
it would be confusing to have some remarks before the associated permit or deny statements and some
remarks after the associated statements.
To include a comment for IP numbered standard or extended ACLs, use the
access-list
access-list
number
remark
remark
global configuration command. To remove the remark, use the
no
form of this
command.
In this example, the server that belongs to Jones is allowed access, and the workstation that belongs to
Smith is not allowed access:
Switch(config)#
access-list 1 remark Permit only Jones server through
Switch(config)#
access-list 1 permit 171.69.2.88
Switch(config)#
access-list 1 remark Do not allow Smith server through
Switch(config)#
access-list 1 deny 171.69.3.13
For an entry in a named IP ACL, use the
remark
access-list 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
Applying an IPv4 ACL to a Terminal Line
You can use numbered ACLs to control access to one or more terminal lines. You cannot apply named
ACLs to lines. You must set identical restrictions on all the virtual terminal lines because a user can
attempt to connect to any of them.
For procedures for applying ACLs to interfaces, see the
“Applying an IPv4 ACL to an Interface” section
. For applying ACLs to VLANs, see the
“Configuring VLAN Maps” section on
.
