Dell 9.7(0.0) - page 291

Defaults 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.

Command

Modes

CONFIGURATION-EXTENDED-ACCESS-LIST

Command

History Version Description

9.7(0.0) Introduced on the S6000–ON.

9.4(0.0) Added the support for flow-based monitoring on the S4810,

S4820T, S6000, and Z9000 platforms.

9.3(0.0) Added the support for logging of ACLs on the S4810,

S4820T, and Z9000 platforms.

Usage

Information When the configured maximum threshold is exceeded, generation of logs is

stopped. When the interval at which ACL logs are configured 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 configured threshold is exceeded, it is re-enabled for this new interval.

If ACL logging is stopped because the configured threshold is exceeded, it is re-

enabled after the logging interval period elapses. ACL logging is supported for

standard and extended IPv4 ACLs, standard and extended IPv6 ACLs, and standard

and extended MAC ACLs. You can configure 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 flow-based monitoring for a monitoring session by entering

theflow-based enable command in the Monitor Session mode. When you

enable this capability, traffic with particular flows 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 specified traffic instead all traffic on the interface.

This feature is particularly useful when looking for malicious traffic. It is available for

Layer 2 and Layer 3 ingress and egress traffic. You may specify traffic 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).

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.

Access Control Lists (ACL) 291