Reference Guide

218 | Access Control Lists (ACL)
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Usage
Information
The monitor option is relevant in the context of flow-based monitoring only. See Chapter 44, Port
Monitoring.
The order option is relevant in the context of the Policy QoS feature only. The following applies:
• The seq sequence-number is applicable only in an ACL group.
• The order option works across ACL groups that have been applied on an interface via QoS policy
framework.
• The order option takes precedence over the seq sequence-number.
• If sequence-number is not configured, then rules with the same order value are ordered
according to their configuration order.
• If the sequence-number is configured, then the sequence-number is used as a tie breaker for
rules with the same order.
When you use the log option, CP processor logs details about the packets that match. Depending on
how many packets match the log entry and at what rate, the CP may become busy as it has to log these
packets’ details.
Related
Commands
Extended IP ACL Commands
When an ACL is created without any rule and then applied to an interface, ACL behavior reflects an
implicit permit.
The following commands configure extended IP ACLs, which in addition to the IP address also
examine the packet’s protocol type.
c and s platforms support Ingress IP ACLs only.
• deny
• deny arp
• deny ether-type
• deny icmp
• deny tcp
• deny udp
• ip access-list extended
• permit
• permit arp
Version 7.4.1.0
Added support for non-contiguous mask and added the
monitor option.
Version 6.5.10
Expanded to include the optional QoS
order priority for the ACL entry.
Note: When ACL logging and byte counters are configured simultaneously, byte counters
may display an incorrect value. Configure packet counters with logging instead.
deny Configure a filter to drop packets.
permit Configure a filter to forward packets.
seq Assign a sequence number to a deny or permit filter in an IP access list while creating the
filter.