Reference Guide

228 | Access Control Lists (ACL)
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Usage
Information
The monitor option is relevant in the context of the flow-based monitoring feature only. Refer
to the Port Monitoring chapter.
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.
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.
You cannot include IP, TCP or UDP (Layer 3) filters in an ACL configured with ARP or
Ether-type (Layer 2) filters. Apply Layer 2 filters to interfaces in Layer 2 mode.
seq
c e s
Assign a sequence number to a deny or permit filter in an extended IP access list while
creating the filter.
Syntax
seq sequence-number {deny | permit} {ip-protocol-number | icmp | ip | tcp | udp} {source mask |
any | host ip-address} {destination mask | any | host ip-address} [operator port [port]] [count [byte]
|
log] [dscp value] [order] [monitor] [fragments]
Parameters
Note: When ACL logging and byte counters are configured simultaneously, byte
counters may display an incorrect value. Configure packet counters with logging
instead.
sequence-number
Enter a number from 0 to 4294967290.
S4810 Range: 1 to 65534
deny
Enter the keyword deny to configure a filter to drop packets meeting this
condition.
permit
Enter the keyword permit to configure a filter to forward packets meeting
this criteria.
ip-protocol-number
Enter a number from 0 to 255 to filter based on the protocol identified in the
IP protocol header.
icmp
Enter the keyword icmp to configure an ICMP access list filter.
ip
Enter the keyword ip to configure a generic IP access list. The keyword ip
specifies that the access list will permit all IP protocols.
tcp
Enter the keyword tcp to configure a TCP access list filter.