Administrator Guide

Version Description
8.1.1.0 Introduced on the E-Series ExaScale.
7.6.1.0 Introduced on the S-Series.
7.5.1.0 Introduced on the C-Series.
7.4.1.0 Added support for the non-contiguous mask and added the monitor option.
6.5.10 Expanded to include the optional QoS order priority for the ACL entry.
Usage
Information
Use the order option only when you use policy-based QoS on the switch. For more information, refer to
the Quality of Service chapter of the C9000 Series Configuration Guide.
When you use the log option, the CP processor logs detail 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.
Use the monitor option only when you are using flow-based monitoring. For more information, refer to
the Port Monitoring chapter of the C9000 Series Configuration Guide.
By default, 10 ACL logs are generated if you do not specify the threshold explicitly. The default frequency
at which ACL logs are generated is five minutes. By default, flow-based monitoring is not enabled.
The software cannot count both packets and bytes; when you enter the count byte options, only bytes
are incremented.
Related
Commands
ip access-list extended — creates an extended ACL.
permit tcp — assigns a permit filter for TCP packets.
permit udp — assigns a permit filter for UDP packets.
permit icmp
Configure a filter to allow all or specific ICMP messages.
C9000 Series
Syntax
permit icmp {source mask | any | host ip-address} {destination mask | any |
host ip-address} [dscp] [count [bytes]] [order] [fragments] [log [interval
minutes] [threshold-in-msgs [count]] [monitor]
To remove this filter, you have two choices:
● Use the no seq sequence-number command if you know the filter’s sequence number.
● Use the no permit icmp {source mask | any | host ip-address} {destination
mask | any | host ip-address} command.
Parameters
source Enter the IP address of the network or host from which the packets were sent.
mask Enter a network mask in /prefix format (/x) or A.B.C.D. The mask, when specified
in A.B.C.D format, may be either contiguous or noncontiguous.
any Enter the keyword any to match and drop specific Ethernet traffic on the
interface.
host ip-address Enter the keyword host and then enter the IP address to specify a host IP
address.
destination Enter the IP address of the network or host to which the packets are sent.
dscp Enter the keyword dscp to deny a packet based on the DSCP value. The range is 0
to 63.
count (OPTIONAL) Enter the keyword count to count packets the filter processes.
246 Access Control Lists (ACL)