Administrator Guide

Version Description
9.4(0.0) Added support for ow-based monitoring on the S4810, S4820T, S6000, and Z9000
platforms.
9.3(0.0) Added support for logging of ACLs on the S4810, S4820T, and Z9000 platforms.
Usage Information
When the congured maximum threshold is exceeded, generation of logs is stopped. When the interval at which
ACL logs are congured to be recorded expires, the subsequent, fresh interval timer is started and the packet
count for that new interval commences from zero. If ACL logging was stopped previously because the congured
threshold is exceeded, it is re-enabled for this new interval.
If ACL logging is stopped because the congured threshold is exceeded, it is re-enabled after the logging interval
period elapses. ACL logging is supported for standard and extended IPv4 ACLs, IPv6 ACLs, and MAC ACLs. You
can congure ACL logging only on ACLs that are applied to ingress interfaces; you cannot enable logging for ACLs
that are associated with egress interfaces.
You can activate ow-based monitoring for a monitoring session by entering theflow-based enable command
in the Monitor Session mode. When you enable this capability, trac with particular ows that are traversing
through the ingress and egress interfaces are examined and, appropriate ACLs can be applied in both the ingress
and egress direction. Flow-based monitoring conserves bandwidth by monitoring only specied trac instead all
trac on the interface. This feature is particularly useful when looking for malicious trac. It is available for Layer 2
and Layer 3 ingress and egress trac. You may specify trac using standard or extended access-lists. This
mechanism copies all incoming or outgoing packets on one port and forwards (mirrors) them to another port. The
source port is the monitored port (MD) and the destination port is the monitoring port (MG).
Related Commands
• deny — assign a IP ACL lter to deny IP packets.
• ip access-list standard — create a standard ACL.
permit arp (for Extended MAC ACLs)
Congure a lter that forwards ARP packets meeting this criteria. This command is supported only on 12-port GE line cards with SFP
optics; refer to your line card documentation for specications.
Syntax
permit arp {destination-mac-address mac-address-mask | any} vlan vlan-id {ip-
address | any | opcode code-number} [count [byte]] [order] [fragments] [log
[interval minutes] [threshold-in-msgs [count]][monitor]
To remove this lter, you have two choices:
• Use the no seq sequence-number command if you know the lter’s sequence number.
•
Use the {destination-mac-address mac-address-mask | any} vlan vlan-id {ip-
address | any | opcode code-number} command.
Parameters
log (OPTIONAL) Enter the keyword log to enable the triggering of ACL log messages.
threshold-in msgs
count
(OPTIONAL) Enter the threshold-in-msgs keyword followed by a value to indicate
the maximum number of ACL logs that can be generated, exceeding which the generation
of ACL logs is terminated with the seq, permit, or deny commands. The threshold
range is from 1 to 100.
interval minutes (OPTIONAL) Enter the keyword interval followed by the time period in minutes at
which ACL logs must be generated. The interval range is from 1 to 10 minutes.
Access Control Lists (ACL) 285