Cisco 10000-2P2-2DC Software Guide - Page 308
Time-Based ACLs, Feature History for Time-Based ACLs
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Time-Based ACLs Chapter 12 Configuring Traffic Filtering Example 12-1 Receive ACL Configuration ip receive access-list 100 access-list 100 deny icmp any any fragments access-list 100 permit icmp any any echo access-list 100 permit tcp 192.168.1.0 0.0.0.255 any eq 22 access-list 100 permit ospf any any precedence internet access-list 100 permit tcp host 10.0.0.1 any eq bgp precedence internet access-list 100 deny ip any any Time-Based ACLs The Time-based ACLs feature allows the network administrator to define a time range when certain resources may be accessed, thus providing greater control over resource usage. While functionally similar to extended ACLs, time-based ACLs control access to the router for a specific time period. A time range, identified by a name, defines the specific times of the day and week that the ACL is active. The access control entries (ACEs) reference the time range name, which imposes the time restriction on the ACEs. The time range relies on router's system clock to activate or deactivate an ACE. Previously, access list statements were always in effect after they were applied to an interface. However, using the time-range command, network administrators can now define when the permit and deny statements in the ACL are in effect. Both named and numbered access lists can reference a time range. When you create a time range, you can specify both absolute and periodic time entries. The periodic command in time-range configuration mode allows you to specify the days of the week and the time of day that the access control entry (ACE) is active. The absolute command in time-range configuration mode allows you to specify a specific time and date to activate the ACE and a specific time and date to stop processing the ACE. You can specify only one absolute entry for each time range. During ACL processing, the router begins evaluating the time range entry attached to the ACE after it reaches the absolute start time. The router then evaluates the periodic values until the router reaches the absolute end entry. No further processing occurs after the router reaches the absolute end value. The Tine-based ACLs feature is described in the following topics: • Feature History for Time-Based ACLs, page 12-4 • Restrictions for Time-Based ACLs, page 12-5 • Configuration Tasks for Time-Based ACLs, page 12-5 • Monitoring and Maintaining Time-Based ACLs, page 12-8 • Configuration Examples for Time-Based ACLs, page 12-8 Feature History for Time-Based ACLs Cisco IOS Release 12.3(7)XI1 12.2(28)SB Description This feature was introduced on the Cisco 10000 series router. This feature was integrated into Cisco IOS Release 12.2(28)SB. Required PRE PRE2 PRE2 12-4 Cisco 10000 Series Router Software Configuration Guide OL-2226-23
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