Cisco 2950 Software Configuration Guide - Page 551
Including Comments About Entries in ACLs
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Chapter 29 Configuring Network Security with ACLs Configuring ACLs Switch# show access-lists Extended IP access list 188 deny tcp any any time-range new_year_day_2000 (inactive) deny tcp any any time-range thanskgiving_2000 (active) deny tcp any any time-range christmas_2000 (inactive) permit tcp any any time-range workhours (inactive) 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_2000 Switch(config-ext-nacl)# deny tcp any any time-range thanksgiving_2000 Switch(config-ext-nacl)# deny tcp any any time-range christmas_2000 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 deny_access deny tcp any any time-range new_year_day_2000 (inactive) deny tcp any any time-range thanksgiving_2000 (inactive) deny tcp any any time-range christmas_2000 (inactive) Extended IP access list may_access permit tcp any any time-range workhours (inactive) Including Comments About Entries in ACLs You can use the remark command 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. For IP numbered standard or extended ACLs, use the access-list access-list number remark remark global configuration command to include a comment about an access list. To remove the remark, use the no form of this command. In this example, the workstation belonging to Jones is allowed access, and the workstation belonging to Smith is not allowed access: Switch(config)# access-list 1 remark Permit only Jones workstation through 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 78-11380-10 Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide 29-17
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